ISSN 0013-8738, Entomological Review, 2014, Vol. 94, No. 4, pp. 623–627. © Pleiades Publishing, Inc., 2014. Original Russian Text © O.P. Negrobov, A.V. Barkalov, O.V. Selivanova, 2014, published in Zoologicheskii Zhurnal, 2014, Vol. 93, No. 1, pp. 189–193.

TAXONOMY

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Two New Species of the Dipteran Genus Dolichopus Latreille (Diptera, Dolichopodidae) from Siberia and Mongolia

O. P. Negrobova, A. V. Barkalovb, and O. V. Selivanovaa aVoronezh State University, Voronezh, 394006 Russia

e-mail: negrobov@list.ru bInstitute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, Novosibirsk,

630091 Russia e-mail: bark@eco.nsc.ru

Received April 12, 2013

Abstract—Two new species of the genus Dolichopus Latreille (Diptera, Dolichopodidae) are described from Mon-golia and Siberia. Dolichopus tschernovi Negrobov, Barkalov et Selivanova, sp. n. is similar to Dolichopus bayati-cus Negrobov, 1976, but differs in the presence of one seta on the hind metatarsus, the shorter 3rd antennal seg-ment, and in the structure of the hypopygium. Dolichopus lenensis Negrobov, Barkalov et Selivanova, sp. n. re-sembles Dolichopus setitarsis Negrobov et Barkalov, 1977, but differs in the slightly widened 2nd–4th segments of the middle tarsus, in the presence of one seta on the hind metatarsus, and in the structure of the hypopygium. Draw-ings of the antennae, tarsi, and hypopygium of the new species are given. The holotypes of the new species are de-posited in the Zoological Institute, the Russian Academy of Sciences (St. Petersburg). DOI: 10.1134/S0013873814040162

Within the Holarctic Region, Dolichopus Latreille, 1796 is one of the most voluminous genus in terms of both the general taxonomic variety and the number of its representatives in various natural ecosystems. Though many species were described recently (Zhang and Yang, 2008; Negrobov and Barkalov, 2008, 2009a, 2009b; Negrobov et al., 2009, 2011, 2012; Barkalov et al., 2009; Negrobov and Kechev, 2010; Kornev et al., 2011; Selivanova and Negrobov, 2011; Selivanova et al., 2012; Maslova et al., 2012), the species composition of the genus has not been studied completely. Taking into account the rate of appearance of new descriptions, we can assume that the World fauna of the genus may comprise at least 800 species.

The present communication is based on examina-tion of the collection of the Zoological Institute, the Russian Academy of Sciences, St. Petersburg.

Dolichopus tschernovi Negrobov, Barkalov et Selivanova, sp. n.

(Fig. 1)

Material. Holotype: ♂, Mongolia, Töv aimak, northern slope of Bogdo-Ula near Ulan Bator, 14.VII.1967 (V. Zaitsev). The holotype is deposited in

the collections of the Zoological Institute, Russian Academy of Sciences, St. Petersburg.

Description. Male. Head. Face silvery-white with faint yellow tint, not reaching lower margin of eyes, slightly narrower in middle part than 3rd antennal segment (0.5 : 0.6). Proboscis dark brown. Palps yel-low, with yellow hairs and 1 black seta. Frons green, shining, with blue tint, with gray pruinosity at sides. Antennae black; 3rd segment oblong-oval, with nearly straight apex and with small apical process ventrally, about 1.5 times as long as wide, covered with small hairs. Ratio of length of 3rd antennal segment to its width and to length of arista 2.0 : 1.3 : 4.5. Arista with small hairs closer to base of dorsal surface of 3rd seg-ment (Fig. 1a). Postocular setae black in upper part of head and yellowish white in lower part.

Thorax green. Mesonotum metallic-shining, with bronze tint; thoracic pleura with gray pruinosity. Propleura with 1 strong seta and small hairs. Legs mostly yellow; fore tarsus, except for metatarsus, mid-dle and hind tarsi entirely, and apex of hind tibia black; apex of middle tibia and base of hind coxa brown. Coxae with silvery pruinosity; fore coxa with pale hairs, with black setae at apex. 2nd–4th segments of fore tarsus slightly thickened, those of middle and hind tarsi slightly widened (Fig. 1b). Femora without

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long hairs ventrally. Fore tibia with 2 anterodorsal, 1 posterodorsal, and 1 posteroventral setae, with long apicoventral seta apically. Ratio of length of fore tibia to those of 1st–5th segments of fore tarsus: 3.1 : 1.5 : 0.7 : 0.5 : 0.3 : 0.4. Middle femur with 1 strong apical seta. Middle tibia with 3 anterodorsal, 1 posterodorsal, and 1 anteroventral setae. Middle metatarsus ventrally with small hairs and with very short seta at base. Ratio of length of middle tibia to those of 1st–5th segments of middle tarsus: 4.9 : 2.7 : 1.3 : 1.0 : 0.7 : 0.6. Hind femur with 1 strong apical seta on outer side. Hind tibia not thickened, apically with long oblique dorsal slit—tibial organ, with 2 anterodorsal and 4 postero-dorsal setae, also with 1 anteroventral seta at apex. Hind metatarsus with 1 strong dorsal seta. Ratio of length of hind tibia to those of 1st–5th segments of hind tarsus: 4.8 : 1.8 : 2.0 : 1.3 : 0.9 : 0.7.

Wings slightly infuscate. On costal vein, stigma rather small, oblong-oval. R4+5 and M1+2 converging

apically; M1+2 weakly curved in apical part, without rudimentary M2. Length ratio of section of costal vein between R2+3 and R4+5 and its section between R4+5 and M1+2 1.3 : 0.6. Length ratio of basal and apical sections of M1+2 4.4 : 4.5. Apical section of M3+4 longer than posterior cross-vein (length ratio 2.7 : 1.0). Anal lobe small, anal angle obtuse. Calypters yellow with white hairs and with 2 or 3 brown hairs in-between. Halteres yellow.

Abdomen green, shining, with black hairs, with white pruinosity at sides. Hypopygium (Figs. 1c–1e): epandrium oval, narrowed toward apical part, with apical emargination dorsally. Apicoventral surstyli narrow, with pointed apices dorsally, slightly longer than wide. Cerci rounded, with dark border at sides, with falcate setae at apex.

Body length 2.8 mm, length of wing 2.9 mm.

Female unknown.

Fig. 1. Dolichopus tschernovi sp. n.: (a) antenna, (b) middle tarsus, (c) gonopods, (d) apicoventral surstylus, (e) hypopygium.

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Differential diagnosis. According to the key to the Palaearctic species of Dolichopus (Negrobov et al., 2005), the new species is closest to Dolichopus bayaticus Negrobov, 1976, but differs in the following characters.

Hind metatarsus with 1 strong seta. 3rd antennal segment about 1.5 times as long as wide. Cerci rounded ....................... Dolichopus tschernovi sp. n.

—Hind metatarsus with 7 strong setae. 3rd antennal segment about twice as long as wide. Cerci oblong-oval .............................. Dolichopus bayaticus Negr.

Etymology. The species is named in memory of the eminent researcher of the Arctic regions, academician of the Russian Academy of Sciences, Yurii Ivanovich Chernov.

Dolichopus lenensis Negrobov, Barkalov et Selivanova, sp. n.

(Fig. 2)

Material. Holotype: ♂, “Irkutsk Gubernia, Lena River,” 14.V.1912 (Naumov). The holotype is depos-

ited in the collections of the Zoological Institute, the Russian Academy of Sciences, St. Petersburg.

Description. Male. Head. Face gray, not reaching lower margin of eyes, nearly as wide in middle part as 3rd antennal segment. Proboscis dark brown. Palps yellow, with yellow hairs. Frons green, shining, with blue tint, with gray pruinosity at sides. Antennae mostly black, 1st antennal segment yellow; 3rd anten-nal segment oblong-triangular, with pointed apex, with small process ventrally (Fig. 2a), covered with small hairs; 3rd segment twice as long as wide; arista with small hairs, situated in middle part of dorsal surface of 3rd segment. Ratio of length of 3rd antennal segment to its width and to length of arista 1.2 : 0.6 : 2.6. Postocular setae black in upper part of head, white in lower part.

Thorax green. Mesonotum metallic-shining, with blue tint, thoracic pleura with gray pruinosity. Propleura with small pale hairs. Legs mostly yellow; apices of segments of fore tarsus, apex of metatarsus, entire 2nd–5th segments of middle tarsus, hind tarsus, and apex of hind tibia black; middle and hind coxae

Fig. 2. Dolichopus lenensis sp. n.: (a) antenna, (b) middle tarsus, (c) hind tarsus, (d) gonopods, (e) hypopygium.

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darkened at bases. Coxae with silvery pruinosity; fore coxa with pale hairs, with black setae at apex. Femora without long hairs ventrally. Fore tibia with 2 antero-dorsal, 2 posterodorsal, and 1 posteroventral setae, apically with long apicoventral seta. Ratio of length of fore tibia to those of 1st–5th segments of fore tarsus: 3.5 : 1.7 : 0.7 : 0.5 : 0.3 : 0.4. Middle femur with 1 strong preapical seta. Middle tibia with 2 anterodor-sal, 2 posterodorsal, and 1 anteroventral setae. Middle metatarsus with very short ventral setae. 2nd–4th seg-ments of middle tarsus slightly widened (Fig. 2b). Ratio of length of middle tibia to those of 1st–5th seg-ments of middle tarsus: 5.2 : 2.7 : 1.4 : 1.0 : 0.8 : 0.4. Hind femur with 1 strong preapical seta on outer side. Hind tibia not thickened, apically with long dorsal oblique slim—tibial organ, with 4 anterodorsal and 4 posterodorsal setae, and with 1 anteroventral seta at apex. 2nd–4th segments of hind tarsus slightly wid-ened (Fig. 2c), hind metatarsus with 1 strong seta dorsally. Ratio of length of hind tibia to those of 1st–5th segments of hind tarsus: 5.5 : 2.5 : 2.4 : 1.6 : 1.0 : 0.7.

Wings slightly infuscate. Costal vein with long stigma. M1+2 weakly curved in apical part, without rudimentary M2. Apices of wings damaged. Apical section of M3+4 longer than posterior cross-vein (2.2 : 1.0). Anal lobe small, anal angle obtuse. Calypters yellow with white hairs. Halteres yellow.

Abdomen green, shining, with dark stripes along margins of tergites, with white pruinosity at sides. Hypopygium (Figs. 2d, 2e): epandrium oval, with straight margin in apical part. Apicoventral surstyli wide, oval, slightly longer than wide. Cerci oval, straight dorsally, with dark border along margins, with falcate setae at apex.

Body length 2.9 mm, length of wing 2.8 mm.

Female unknown.

Differential diagnosis. According to the key to the Palaearctic species of Dolichopus (Negrobov et al., 2005), the new species is closest to Dolichopus seti-tarsis Negrobov et Barkalov, 1977, but clearly differs in the following characters. 2nd–4th segments of hind and middle tarsi slightly

widened. First segment of hind tarsus with 1 strong seta. Third antennal segment black .......................... ........................................ Dolichopus lenensis sp. n.

—2nd–4th segments of only hind tarsus widened. First segment of hind tarsus with 18–20 strong setae.

Third antennal segment yellow, darkened only dor-sally ................ Dolichopus setitarsis Negr. et Bark.

Etymology. The name of the new species is based on the name of the Lena River.

ACKNOWLEDGMENTS The study was financially supported by the Russian

Foundation for Basic Research (grant nos. 1104-01051 and 13-04-00202-a).

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