Tenuopus unicolor (Becker, 1914)

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 : 21-23

Tenuopus unicolor (Becker, 1914)

Figs 6 , 14 , 22

Psilopus unicolor Becker, 1914: 126 . Type locality: Kenya.

Sciapus unicolor: Becker, 1923: 48 .

Tenuopus unicolor: Dyte & Smith, 1980: 449 .

TYPE MATERIAL. Neotype, here designated: ♂, Kenya: Kiambu Co., 0.932°S,

36.616°E, 2600 m, 18.XII 2013, N. Vikhrev [ ZMUM] .

DESCRIPTION. Male. Head: frons black, densely brownish pollinose; one pair of well developed postvertical setae; upper postocular setae black, increasing in length upward; lateral and lower postoculars white; ventral postcranium covered with irregular white hairs; face silvery-white, 5 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 blackish-brown postpedicel; pedicel projected distally on inner side, with a crown of short black setae, one of dorsal setae as long as pedicel; postpedicel rounded-oval, slightly longer than high at base (1.5/1.2);

arista-like stylus dorsal, with short hairs; length ratio of scape to pedicel to postpedicel to stylus (1 st and 2 nd segments), 4/5/6/2/30; palpus and proboscis short,

yellow, covered with white hairs, proboscis also with a pair of black lateral setae.

Thorax: pleura yellow; mesonotum orange, dark medially on posterior part;

scutellum dorsally mostly metallic blue-green; 6 dorsocentral setae with posterior pair shifted laterally; acrostichals uniseriate, strong, nearly reaching 5 th dorsocentrals;

scutellum with 2 strong bristles and 2 short lateral hairs; proepisternum with 2

yellow setae.

Legs yellow, slightly darkened distally; tarsi brown from tip of basitarsus; 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 numerous dark fine erect ventral hairs, at most half as long as diameter of femur,

and 3 long black posteroventral cilia; fore tibia simple, with elongate ventral and posterior setulae, 1 anterodorsal and 1 posterodorsal at base, 1-2 dorsals in middle,

1-2 apical setae; basitarsus with elongate setulae ventrally, slightly thickened at apex; 2 nd to 5 th segments with full posteroventral row of strong erect setulae; 2 nd to

4 th segments with 1-2 short dorsoapical setae; claws simple; mid femur with strong anterior preapical seta, with erect black ventral hairs, at most half as long as diameter of femur; mid tibia with 3 anterior, 3 posterodorsal, 3-5 ventral, 4-5 apical setae;

mid basitarsus with several short ventral setae; hind femur without long hairs, with 1

strong anterior preapical seta; hind tibia with 3-4 anterior, 2 anterodorsal, 2

posterodorsal, 3-4 apical setae. Femur, tibia and tarsomere (from first to fifth)

length ratio: fore leg: 17/20/13/10/5/8/3, mid leg: 18/24/15/6/5/3/2, hind leg:

16/26/7/8/4/3/2.

Wing greyish, 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, 5/1; 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, 5/15/15; 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; 1 st segment yellow, with small brown posterior spot dorsally; 2 nd – 5 th yellow, with black edgings anteriorly and posteriorly; the edgings wider dorsally; 6 th, 8 th segments and epandrium entirely black; epandrial lobes brown; hypandrium small, simple; phallus thin and simple; 1

reduced epandrial lobe bearing 2 long apical setae at base of hypandrium; 1 long epandrial lobe distally bearing small ventral subapical spine; 1 longer distoventral lobe bearing 1 long and 1 short subapical setae and small declinate apical lobule with fringe of 8 setulae at apex; 1 very long and broad sword-shaped striated distoventral lobe, as long as epandrium, bearing small apical spine; surstylus black, long and curved, half as long as epandrium, bearing 1 minute seta on angular apex, 3 short setae at middle and trangular dorsal tooth at middle; cercus yellow, twice longer than epandrium, elongate-rectangular, with toothed distal margin, covered with long, mostly black hairs, denser at apex.

MEASUREMENTS (in mm). Body length 6.0; antenna length 1.5; wing length

6.2; wing width 1.9, hypopygium 1.4.

DISTRIBUTION. Type locality: Kenya . DR Congo, Kenya .

DIAGNOSIS. T. unicolor belongs to a group of species with uniseriate acrostichals, being the closest to T. shcherbakovi , differing from the latter in male and female postpedicel oval, longer than high; male cercus band-like, almost evenly wide (see key above).

NOTES. The species was described by a single female taken by the expedition of Ch. Alluaud and R. Jeannel from environs of Mt. Kenya at 2400 m a.s.l. as follows from the original paper of Becker (1914) and from the date of collection (22

January 1912). It was later recorded by females only ( Grichanov, 1996 , 2000). The holotype must be deposited in the collection of Muséum National d’Histoire

Naturelle (Paris, France), but it was not found there, as well as in other European museums keeping Becker’s types, being most probably lost. Therefore, I designate here the neotype of Psilopus unicolor collected not far from the type locality. The specimen corresponds to the original description by Becker (1914, 1923) and to the diagnosis of Tenuopus unicolor female provided by Grichanov (1996) .

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 19–22. Tenuopus spp., epandrial lobes and surstylus, right lateral view: 19 – T. kylei