Chrysotus chandleri Negrobov, Naglis et Maslova

O. P. Negrobov, S. Naglis & O. O. Maslova, 2016, A New Species Of Chrysotus Meigen, 1824 (Diptera, Dolichopodidae) From Caucasus, Far Eastern Entomologist 307, pp. 1-5 : 2-4

Chrysotus chandleri Negrobov, Naglis et Maslova , sp. n. Figs 1–4

MATERIAL. Holotype – ♂, Russia: “Mountain Dzhuga, Kuban oblast, Moykopskoe otdelenie” (= Krasnodar region: Tuapse district, Mt. Dzhubga), 17.VI 1911, coll. Volnuhin ( ZIN). Paratype: 1 ♂, same data as holotype ( ZIN).

DESCRIPTION. Male. Frons metallic green, with gray pollen. Face dark, with brown pollen, its width is less the distance between ocellar setae. Antennae black, postpedicel large, transversely oval. Palps brown. Legs black with black setae. Mid tibia with 2 long anterodorsal bristles. Hind tibia with long setae on the outer side. Wings no darkened. Halters dark. Fore tibia without long hairs.

Head. Frons metallic green, with gray pollen. Face dark, with brown pollen, its width is less the distance between ocellar setae, its width in the middle is about twice less than the length of the postpedicel (0.2: 0.4). Antennae black, postpedicel large, transversely oval, with short hairs. Width of postpedicel longer than its length (0.9: 0.4). Stylus subapical, with short hairs, much longer than postpedicel (0.4: 2.6). Palps brown, with black hairs. Lower postoculars white.

Thorax. Shining green, weakly grey pollinose; pleura grey pollinose. Mesonotum shiny green with violet shade. 6 pairs of strong dorsocentral bristles. Proepisternum with black setae. Acrostichals biseriate, well developed. Scutellum with a pair of strong medial scutellars. Legs black with black setae. Fore coxae with black setae. Fore femur with short anteroventral hairs. Fore tibia with 2 strong anterodorsal setae, its length is shorter than the diameter of the tibia. Fore tarsus without short hairs. Mid femur with few short anteroventral bristles. Mid tibia with 2 long anterodorsal bristles. Mid tarsus without short hairs. Hind femur with long anteroventral bristles, its length is more than half the width of the femur. Hind tibia with 2 long anterodorsal and 2 posterodorsal bristles, and with long setae on the outer side which are not longer than the diameter of the tibia, and with a number of short black bristles on the ventral side. Hind tarsus with short hairs. Podomeres (from tibia to fifth tarsomere) length ratio: fore leg: 3.3: 1.7: 0.8: 0.6: 04: 0.3, mid leg 5.0: 2.0: 0.9: 0.6: 0.5: 0.4, hind leg 4.5: 1.4: 1.0: 0.7: 0.5: 0.4.

Wings. Membrane no darkened; veins dark; R4+5 and M1+2 parallel at the apex; costal section between R 2+3 and R 4+5 about twice as long as the costal section between R4+5 and M1+2 (1.9: 0.9); distal section of M1+2 longer than basal section (5.7: 3.5); ratio of cross-vein dm-cu to distal part of CuA1 0.9: 2.8; lower calypter with black cilia; halter black.

Abdomen. Metallic green, grey pollinose, covered with black hairs; epandrium nearly circular; surstylus narrow, curved ventrally at apex, with setae in apical part. Aedeagus without appendages. Cerci oval with fine black bristles.

Female unknown.

MEASUREMENTS. Body length 1.8–2.2 mm, wing length 1.9 mm.

ETYMOLOGY. The new species is named after the English dipterologist Peter Chandler.

COMPARISON. According to the key to the Palaearctic species of the genus Chrysotus ( Negrobov et al., 2000) , the new species is keyed to Ch. blepharosceles , but differs by the following characters:

1(2) Halters dark. Fore tibia without long hairs. Hypopygium – Fig. 3 . Aedeagus at the apex without lateral processes ( Figs 1, 4 ) ..…..… Chrysotus chandleri sp. n.

2(1) Halters yellow. Fore tibia with long dorsal and ventral hairs, longest hairs longer than the diameter of the tibia. Hypopygium – Fig. 5 . Aedeagus at the apex with 2 lateral processes ( Figs 6, 7 ) ………………. Ch. blepharosceles Kowarz, 1874

Figures

Figs. 1 – 7. Chrysotus spp. 1 - 4 – C. chandleri, sp. n.: 1 – aedeagus, lateral view, 2 – antenna, 3 – hypopygium, lateral view, 4 – aedeagus, dorsal view; 5 - 7 – C. blepharosceles Kowarz; 5 – hypopygium, lateral view, 6 – apical part of aedeagus, lateral view, 7 – aedeagus, dorsal view.