Tenuopus bururiensis Grichanov, 2018

Grichanov, I. Ya., 2018, A new subfamily of Dolichopodidae (Diptera) for Tenuopus Curran, 1924 with description of new species from Tropical Africa, Far Eastern Entomologist 365, pp. 1-25 : 6-8

Tenuopus bururiensis Grichanov , sp. n.

Figs 1 , 8 , 15

TYPE MATERIAL. Holotype – ♂, Burundi: Bururi Prov., Res. Nat. Forestière de Kigwena , 4°05.949'S, 29°30.455'E, 810 m, 17–20.XI 2010, A.H. Kirk-Spriggs /

malaise trap, circumguinean forest [ BMSA].

DESCRIPTION. Male. Head: frons black, whitish pollinose; one pair of short postvertical setae, as long as uppermost postocular seta; upper postocular setae black, increasing in length upward; lateral and lower postoculars white; ventral postcranium covered with irregular white hairs; face silvery-white, 8 times as high as wide in middle, nearly as wide as postpedicel; clypeus slightly bulging; antennae as long as height of head, with yellow scape and pedicel and yellow-orange postpedicel;

pedicel projected distally on inner side, with a crown of short black setae, one of dorsal setae as long as pedicel; postpedicel rounded, slightly longer than high at base (2.1/1.7); arista-like stylus dorsal, with short hairs; length ratio of scape to pedicel to postpedicel to stylus (1 st and 2 nd segments), 5/5/7/2/26; palpus and proboscis short, yellow, covered with white hairs, proboscis also with a pair of black lateral setae.

Thorax: pleura yellow; mesonotum mostly orange-yellow, with median greenish blue stripe half as wide as surface between dorsocentral bristles, wider posteriorly;

scutellum greenish blue dorsally; 6 dorsocentral setae with posterior pair shifted laterally; acrostichals biseriate, strong, nearly reaching 5 th dorsocentrals; scutellum with 2 strong bristles and 2 short lateral hairs; proepisternum with 2 yellow setae.

Legs yellow; last segments of hind tarsus brown; fore and mid coxae with black hairs anteriorly and 5-7 black apical bristles of various length; hind coxa with one long black outer bristle above middle; fore femur with light fine erect ventral hairs,

at most as long as diameter of femur, longer at apex, and 1 long black posteroventral cilia; fore tibia simple, with 1 anterodorsal and 1 posterodorsal at base, 2 dorsals in middle, 1-2 apical setae; basitarsus with 2 dorsals; other tarsomeres simple; claws simple; mid femur with small anterior preapical seta, with white ventral hairs, at most as long as diameter of femur; mid tibia with 3 anterior, 3 posterodorsal, 3 ventral, 3-

4 apical seta; hind femur without long hairs, with 1 strong anterior preapical seta;

hind tibia with 3 anterior, 2 dorsal, 6 posterodorsal, 2-3 apical setae. Femur, tibia and tarsomere (from first to fifth) length ratio: fore leg: 14/16/18/10/7/3/2, mid leg:

17/25/17/8/6/3/1, hind leg: 14/25/9/8/5/2/1.

Wing greyish, almost hyaline, veins brown; subcosta very thin; ratio of part of costa between R 2+3 and R 4+5 to that between R 4+5 and M 1, 11/1; M 1 with gentle arc to apex, reaching costa right before wing apex; M 2 present as fold on membrane;

crossvein dm-m straight; ratio of crossvein dm-m to apical part of M 1+2 (fork-handle)

to apical part of M 4, 4/12/10; anal vein foldlike, not reaching wing margin; anal angle obtuse; lower calypter yellow, with black apex and pale setae; halter yellow with orange knob, halter stem thin and long, with dorsal and ventral groups of short hairs distally.

Abdomen mostly yellow-orange, black setose; 2 nd –5 th yellow, with narrow black posterior edging; 6 th, 8 th segment and epandrium entirely yellow; 8 th segment with yellow hairs; cerci and surstyli yellow; surstylus and epandrial lobe black at apex;

cercus covered with dark-yellow hairs and setae; hypandrium small, simple; phallus thin and simple; epandrial lobe prominent, somewhat expanded distally, with 3 apical setae; 2 pedunculate epandrial setae of different length and 3 fused epandrial processes between hypandrium and base of epandrial lobe, including 1 process with rather long apical seta, 1 process with microscopic apical seta and 1 shorter process with moserately long seta; surstylus about as long as cercus, with apical incision, with thin pointed dorsal and thick ventral lobes; dorsal lobe of surstylus with 1 microscopic apical seta; ventral lobe of surstylus with 1 small inner seta; cercus as long as epandrium, subtriangular, with pointed apex, covered with hairs dorsally and few setae distally.

MEASUREMENTS (in mm). Body length 7.5; antenna length 1.7; wing length

6.6; wing width 1.9.

Female. Unknown.

ETYMOLOGY. The species is named after the type locality.

DISTRIBUTION. Burundi.

DIAGNOSIS. T. bururiensis sp. n. belongs to a group of species with biseriate acrostichals, being the closest to T. fursovi , differing from the latter in male fore tarsus simple, male surstylus broad (see key above).

Figures

Figs 1–6. Tenuopus spp., head: 1 – T. bururiensis sp. n.; 2 – T. gorongosaensis sp. n.; 3 – T. kirkspriggsi sp. n.; 4 – T. kylei sp. n.; 5 – T. lomholdti sp. n.; 6 – T. unicolor (Becker).

Figs 7–14. Tenuopus spp. 7 – T. shcherbakovi Grichanov, head in ethanol with everted

Figs 15–18. Tenuopus spp., epandrial lobes and surstylus, right (15, 18) and left (16) lateral