218 THE CANADIAN ENTOMOLOGIST SEPTEMBER, 1925.

lived more than 24 hours, and some less than that time. None of these had mated. Miss Morgan (1911) estimates that the number of eggs laid by one female is thirty-seven hundred.

BIBLIOGRAPHY

Berry, Edward W. 1903. New and hitherto unknown Ephemerid nymphs. of the Eastern U. S. American Naturalist 37 : 25-31.

Clemens, Wilber A. 1917. .4n ecological study of the mayfly Chirotonetes. Univ. off Toronto Studies, Biol. Ser., pp. 1-42.

Eaton, A. E . 1883. A revisional monograph of recent Ephemeridae or mayflies. Trans. Linnean Soc. Lond. 2nd series, 3 : 101-102.

Morgan, Anna H. 1911. RiIayflies of Fall Creek, N. Y. Ann. Ent. Soc. Amer. 4 : 93-1 19.

1913. A contribution to the biology of mayflies. Ann. Ent. Soc. Amer. 6 : 371-413.

Needham, James G. 1905. Mayflies and Midges of New York. Bull. 86, N. Y. S. MUS. pp. 40-41.

Packard, Alpheus S. 1889. Duration of life in an Ephemera.Psyche 5 :168. Say, Thomas. 1823. Description of insects belonging to the order Neuroptera.

West. Quart. Reporter, 2 : 172.

FOUR NEW PHLOEOTHRIPIDAE FROM T H E UNITED STATES

(THYSANOPTERA).

BY J. DOUGLAS HOOD,

University of Rochester. The types of the new species described below are in the author's collection

Rhynchothrips debilis sp. nov. Male (macropterous). Length about 1.3 mm. Color light brown, with

orange red subhypodermal pigmentation ; antennae pale yellow, gradually shad- ing to light brown in segments 7 and 8 ; legs light brown, with tarsi, distal ends of tibiae, and inner surface of femora (except at extreme base), pale yellow; fore wing heavily clouded with brown, much darker basally; hind wings brownish at extreme base, clear beyond.

Head broad, nearly 1.25 times as wide as long, broadest behind eyes; cheeks rounded, distinctly converging posteriorly, the head at base 0.85 the greatest width; lateral and dorsal surfaces striate with widely spaced anastomosing lines, which become reticulate on vertex, and with the usual minute, transparent bristles ; vertex broadly rounded in front, overhanging insertion of antennae and bearing the anterior ocellus at its extremity; postocular bristles nearly as long as eyes, almost pointed, dark in color; a pair of strong bristles on the same line with. and dividing into thirds the space between, postoculars. Eyes about one-third as long as head, nearly as wide as their interval. Ocelli situated well forward. Antennae nearly 2.8 times as long as head; segments 3-8 long and slender, 4 much longer than 5 and about 2.4 times as long as wide; 3-5 subclavate, pedicels not sharply separated from rest of segment; 6 and 7 distinctly pedicellate, the latter broadly united to 8, which is slender and nearly three times as long as wide. Mouth cone long and pointed, reaching middle of mesosternum.

Prothorax along median dorsal line only 0.57 as long as head and (inclusive

LVII. THE CANADIAN l%NTOMOLOGIST 219

of coxae) 3.3 times as wide as long, without a median dark line, surface without sculpture; all bristles present, blunt but not knobbed, dark in color, outer pair at posterior angles somewhat longer than postoculars, inner pair slightly shorter, midlaterals still shorter, the two pairs on anterior margin decidedly shorter and slenderer than inidlaterals. Pterothorax slightly wider than ~ro thorax , sides slightly convex, nearly parallel. Wings of fore pair with the three subbasal bristles blunt, dark brown, subequal in length, basal one somewhat slenderer. Legs long and particularly slender; fore tarsi unarmed.

Abdomen broader than pterothorax. Tube more than 0.9 as long as head. 2.2 times as long as basal width, which is twice the apical. Bristles nearly pointed, brown; lower lateral pair on segment 9 slightly longer than tube, much longer than terminal bristles.

Measurenlents of holotype ( $ ) : Length 1.25 mm.; h a d , length 0.147 mm., width behind eyes 0.182 mm., at base 0.155 mm.; prothorax, length 0.084 nlnl., width (inclusive of coxae) 0,275 mm. ; pterothorax, width 0.300 mm. ; abdomen. width 0.315 mm. ; tube, length 0.138 mm., width at base 0.063 inm., at apex 0.031 mm.

Antenna1 segments I 2 3 4 5 6 7 8 Length (PI 30 47 64 68 60 59 51 32 Width (P) 28 28 26 28 27 26 23 12

Total length of antenna 0.41 mm. Described from one male, taken at Whitesbog, n'ew Jersey, July 6, 1915, by

H. K. Plank, by sweeping cranberry (No. 276). This species has the slenderest legs, the longest antennae, the shortest

prothorax and the broadest head to be found in its genus. Eurythrips macrops sp. nov.

Female (niacropterous) .-Length 1.5 nim. Color light brown, thorax and tip of abdoinen slightly darker, with orange-red subhypodermal pigmentation which appears bright crimson-red by transmitted light; legs yellow, with femora and tibiae darkened with brown; antennae dark brown, gradually darker toward tip, segments I and 2 slightly paler, 3 with pedicel pale yellow.

Head slightly longer than wide, very slightly constricted at posterior angles of eyes, cheeks nearly straight and parallel, noticeably roughened throughout their length by anastornosing lines which do not extend onto dorsum of head; vertex slightly elevated and produced, nearly overhanging, bearing the anterior ocellus at its extremity; postocular bristles about half as long as head, expanded and obliquely truncate at tip, nearly colorless; postocellar bristles minute; occi- put with a pair of small bristles midway between eyes and base of head, dividing the width of head into thirds. Eyes about one-third as long as head, not strongly bulging, though rounded and protruding, three-fourths as wide as long and three- fourths as wide as their interval, finely facetted, about 7 facets making up their lateral outline. Ocelli not situated far forward, the posterior margin of posterior ocellfi opposite center of eyes; anterior ocellus directed forward. Antennae nearly 2.5 times as long as head; seginents 3-7 pedicellate; 8 lanceolate, decidedly narrowed and subpedicellate at base and thus not at all broadly united to 7. Mouth cone particularly short, semicircularly rounded at apex, not attaining middle of prosternutn; tip of labruni not attaining that of labium.

220 THE CANADIAN ENTOMOLOGIST SEPTEMBER, 1925.

Prothorax relatively short and broad, 0.8 as long as head and (inclusive of coxae) 2.2 times as wide as long, surface without sculpture; anterior marginal bristles exceedingly m'lnute, all others long, slender, dilated and obliquely trun- cate a t apex, nearly colorless, midlaterals and the two pairs at the posterior angles about equal to postoculars, those at anterior angles only slightly shorter. Ptero- thorax distinctly wider than prothorax, narrowed posteriorly, sides slightly con- vex. Wings of nearly the same width throughout, quite uniform brownish but darker basally, with a faint, dark, median plica beyond base; no accessory hairs on posterior inargin near tip; the three subbasal bristles dilated at apex, nearly colorless, basal one about equal to that on fore coxa, others slightly longer. Legs rather short and strong; fore tarsi with a minute, slightly curved tooth.

Abdomen slightly wider than pterothorax. Tube equal in length to head, and somewhat more than twice as long as basal width, which is distinctly more than twice the apical; sides concave. Bristles long and pale, those on segments 2-8 expanded and obliquely truncate a t apex, those on 9 all pointed and nearly as long as the tube; terminal bristles also pale, slightly more than half as long as tube.

Measurements of holotype ( $2 ) : Length 1.46 mm. ; head, length 0.173 mm., greatest width 0.162 mm., width behind eyes 0.153 inm.; eyes, length 0.059 mm., width 0.046 mm., interval 0.061 mm. ; postocular bristles, length 0.085 mm. ; prono- turn, length o. I40 mm., width (inclusive of coxae) 0.308 min. ; pterothorax, width 0.345 mm.; abdomen, width 0.377 m n ~ . ; tube, length 0.174 mm., width at base 0.082 min., a t apex 0.035 mm. Antenna1 segments I 2 3 4 5 6 7 8

Length (P) 45 52 65 62 63 55 46 45 Width (P) 39 33 32 33 32 28 27 18

Total length of antenna 0.43 mm.

Described from one female talteil by C. B. Will~ams at Orlando, Florida, November 4, 1914, on "grass by small lake" (C. B. W . No. 515).

The expanded bristles and long tube separate it from all its congeners ex- cept osborni, which has the head and basal antennal segments yellow, instead of brown, and the cheeks strongly diverging posteriorly, instead of parallel. Osborm' has much smaller eyes.

Eurythrips tassalis sp. nov. Female (macropterous) .-Length about 1.7 mm. Color nearly uniform

dark blackish brown, with scattered, yellow, subhypoderinal pigmentation which appears black by transmitted light; all tarsi, most of fore tibiae, and distal ends crf mid and hind tibiae, bright, pale yellow; antennal segments I and 2 slightly paler than remainder of antenna, which is dark blackish brown, except pedicel of segment 3, which is abruptly yellow.

Head about 1.36 times as long as greatest width, sharply constricted behind eyes, rapidly broadening to basal fifth, narrowing slightly to base, free of sculp- ture excepting three or four faint, anastoinosing striae at base; cheeks evenly rounded, perfectly sinooth excepting a t base; vertex slightly elevated and produc- ed, nearly overhanging, bearing the anterior ocellus at its extremity; postocula~ bristles half as long as head, slender and sharply pointed, yellowish; postocellar bristles remarkably long for the genus, surpassing anterior ocellus, pointed; occi-

LVII. THE CANADIAN ENTOMOLOGIST 22 I

put with a pa,ir of smaller bristles laidway between eyes and base of head, not so widely separated as postoculars. Eyes little more than 0.2 as long as head, strongly bulging, three-fourths as wide as long, and slightly more than half as wide as their interval, coarsely facetted, not more than four or five facets making up their lateral outline. Ocelli located fa r forward, anterior one directed forward; center of posterior ones opposite anterior margin of eyes. Antennae about twice 'as long as head; segments 3-7 pedicellate; 8 broadly united at base to 7. Mouth cone short, semicircularly rounded at apex, reaching about half way across prosternum, tip of labrum not surpassing that of labium.

Prothorax 0.8 as long as head and (inclusive of coxae) 1.75 times as wide as long, surface without sculpture; anterior marginal bristles exceedingly n~inute, all others long, slender, nearly pointed, yellow in color, those a t posterior angles nearly as long as postoculars, those at anterior angles shortest. Pterothorax distinctly wider than prothorax, narrowed posteriorly, sides slightly convex. Wings of nearly the same width throughout, quite uniform brownish, with scale and tip darkest ; no accessory hairs on posterior margin ; the three subbasal bristles pointed, yrllomrish, the basal one shortest. Legs quite short and strong; fore tarsi with a slightly curved, sharp tooth which is more than half as long as width of tarsus.

Abdomen only slightly wider than pterothorax. Tube about two-thirds as long as head and 1.8 times as long as basal width, which is twice the apical; sides straight. Bristles long, slender, pointed, yellow, upper pair on segment 9 sur- passing tube; terminal bristles brown, much shorter than tube.

Measureinents of holotype ( 9 ) : Length 1.65 mm. ; head, length 0.224 mm., width 0.165 mm., width behind eyes 0.120 mm.; eyes, length 0.048 n ~ m . . width 0.036 mm., interval 0.066 mm. ; postocular bristles, length 0.1 I I mm. ; prothorax, length 0.180 mm., width (inclusive of coxae) 0.315 mm. ; pterothorax, width 0.375 mm.; abdomen, width 0.390 mm.; tube, length 0.149 mm., width at base 0.083 mm., at apex 0.041 mm.

Antenna1 segment I 2 3 4 5 6 7 8 Length (PI 4s 57 61 59 61 60 49 39 Uxidth (P) 45 37 34 37 34 33 29 I7

Total length of antenna 0.43 mm. Described from one female taken by Mr. I,. 0. Jackson at East Falls

Church, Virginia, March 17, 1918, at base of A?ldropogo~z leaves (No. 356). A very distinct species, recognizable at once by the dark color, long head,

hroadly rounded nioutl~ cone, pronlinent postocellar bristles, and strongly toothed tarsi. The type is abnornlal in having three prominent bristles at one of the posterior angles of the prothorax, instead of two.

Adiaphorothrips amplus sp. nov. Female (macropterous).-Length about 3.3 mm. General color dark

blackish brown, with trochanters, knees and tarsi yellowish; antennae with seg- ments I , 2, 7 and 8 concolorous with body, 2 paler at apex; 3 mostly yellow shading to brownish apically; 4-6 with a narrow brown ring at extrenlc base. brownish yellow beyond, then darkened with brown apically, 6 with very little yellow ; wings clear.

I-Iead abont twice as long as wide, distinctly depressed and prolonged it1 front of eyes; vertex not produced nor overhanging, sides nearly parallel

222 THE CANADIAN ENTOMOLOGIST SEP'I'EMBER, 1925.

but slightly broadest one-third from base and narrowest at posterior margins of eyes; dorsal surface coarsely transversely striate with anastomosing lines which become distinctly reticulate at base of head; ventral surface more deeply and closely striate, particularly at sides behind eyes, and with several very shal-. low, irregular, transverse furrows in anterior half which give the cheeks, when viewed from above, a subcrenulate outline; postocular bristles pointed, nearly as long as eyes; no prominent bristles in the region of ocelli; cheeks with four or five rather strong bristles. Eyes small, less than one fourth as long as head, much narrower than their interval, projecting beyond outline of head. Ocelli approximate; anterior ocellus distinctly behind anterior margin of eyes and much closer to posterior ocelli than these are to each other. Antennae one and two-thirds times as long as head; intermediate segments elongate, subclavate, 3 about five times as long as wide. Mouth cone short, semicircularly rounded at apex, tip of labrum not attaining that of labium; palpi short.

Prothorax about half as long as head and (inclusive of coxae) twice as wide as long, with distinct median thickening; surface rather faintIy sculptured with anastomosing lines along posterior margin, subreticulate at sides anteriorly ; bristles reduced in size, excepting the two pairs at posterior angles, which are sub- equal to postoculars, inner pair longer, pointed. Pterothorax slightly wider than prothorax, sides slightly arched and converging posteriorly, meso- and meta- scuta subreticulate. Legs rather short; fore femora not swollen; fore tarsus with a stout, triangular tooth. Wings of fore pair colorless, expanded apically, closely fringed with colorless hairs, and with 30 or 31 accessory hairs on posterior margin; subbasal bristles small, colorless, blunt or slighty expanded a t tips. the basal one shortest, distal one longest.

Abdomen stout and heavy, about 1.5 times as wide as prothorax, rather lightly subreticulate at sides. Tube about three-fourths as long as head, more than three times as long as basal width, which is more than twice the apical, sides straight, smooth, without noticeable bristles. Abdominal bristles long and point- ed, brownish; tergites without sigmoid bristles; terminal bristles about half as long as tube.

Measurements of holotype ( ? ) : Length 3.34 mm. ; head, length 0.564 mm., width 0.288 mm.; eyes, length 0.125 mm., width 0.080 mm., interval 0.11 j mm. ; postocular bristles, length 0.113 mm. ; prothorax, length 0.273 mm., width 0.555 mm.; pterothorax, width 0.591 mm.; abdomen, width 0.830 mm.; tube, length 0.428 mm., width at base 0.132 mm., at apex 0.057 mm. ; terminal bristles, length 0.225 mm.

Antenna1 segments I 2 3 4 5 6 7 8 Length (P) 97 92 231 156 124 102 82 60 Width (P) 66 4s 47 48 42 38 33 20

Total length of antenna 0.94 mm. Described from one female, taken by Dr. Alex Wetmore, of the U. S.

Biological Survey, at Bradentown, Florida, January 20, 1919, by sweeping (No.

527). This is the first species of the genus to be recorded from North America.