Systenus bartaki, Naglis, Stefan, 2017

Naglis, Stefan, 2017, A new species of Systenus Loew (Diptera, Dolichopodidae) from Croatia, Alpine Entomology 1, pp. 39-41 : 39

Systenus bartaki sp. n. Fig. 1

Type material.

Holotype>: Croatia, Gorni Muc, 500 m, abandoned garden, MT [malaise trap], 43°41'27"N, 16°29'44"E, 24.viii.-14.ix.2014, B. Kokan leg. (to be deposited at CULSP).

Diagnosis.

Antennal scape and pedicel yellow, postpedicel black, but basoventral 1/3 yellow, 3 times as long as basal height; arista 1/5 as long as postpedicel; veins R4+5 and M parallel in distal part; apical section of CuA 2.5 times as long as crossvein dm-cu; hypandrium curved, with a pair of long sinuous setae; cercus long and broad, triangular.

Description.

Male. Body length (holotype): 2.0 mm, wing length 2.0 mm. Head: frons and face metallic green, with dense greyish pruinosity, narrowest distance between eyes about equal to the distance between ocellar setae; palpus yellow; proboscis dark brown; antennal scape and pedicel yellow; postpedicel (Fig. 1A) black, except basoventral 1/3 yellow, 3 times as long as basal height, with dense short hairs; arista apical, bare, 1/5 as long as postpedicel; postocular setae white. Thorax: mesonotum metallic blue-green shining, with grey pruinosity; thoracic setae black; 6 pairs of strong dc; ac short, consisting of 10-12 pairs; scutellum with a pair of strong marginal setae and 2 smaller lateral setae; 2-3 yellow ppls; pleura same coloration as mesonotum. Legs: including coxae pale yellow, hind femur with a brown dorsoapical patch, setae and hairs black except as noted. Fore leg: coxa with pale yellow anterior setae; femur, tibia and tarsomeres lacking major setae; relative podomere ratios: 40:40:20:10:7:4:5. Mid leg: coxa with pale yellow anterior setae; femur bare; tibia with a pair of ad/pd setae at 1/4; tarsomeres bare; relative podomere ratios: 49:51:27:16:10:7:5. Hind leg: coxa with a strong pale lateral seta; femur bare; tibia with a row of 5-6 short pd setae; tarsomeres bare; relative podomere ratios: 50:64:13:25:14:10:6. Wing: hyaline, veins brownish-yellow; R3+4 and M parallel in apical half; CuAx ratio: 0.4; RMx ratio: 1.5; lower calypter pale yellow, with yellow setae; halter pale yellow. Abdomen: metallic blue-green shining; hairs and setae brown. Hypopygium (Fig. 1B): epandrium dark brown; cercus and surstylus white, hypandrium yellowish-brown. Epandrium rectangular; hypandrium curved, with acute apex, bearing a pair of long sinuous setae; surstylus narrow and straight, with a basoventral and a basodorsal projection and with two subapical setae; cercus long, triangular, broadened medially.

Female: unknown.

Etymology.

The new species is dedicated to the Czech dipterist Miroslav Bartak.