Drapetis zamba Grootaert et Shamshev

Grootaert, Patrick & Shamshev, Igor, 2013, The flies of the family Hybotidae (Diptera, Empidoidea) collected during the Boyekoli Ebale Congo 2010 Expedition in Democratic Republic of Congo, Zootaxa 3603 (1), pp. 1-61 : 18

Drapetis zamba Grootaert et Shamshev sp. nov.

( Figs. 19–22 )

Material examined. HOLOTYPE, 3 labelled: D.R. CONGO, Kona , 11 May 2010, primary swamp forest (reg. 30033, leg. P. Grootaert; MS name Drap1); Holotype / Drapetis zamba / Grootaert et Shamshev sp. nov. ( RBINS). PARATYPES: D.R. CONGO: 1 3, 1 Ƥ, Kona , 13 May 2010, primary swamp forest (reg. 30038, leg. P. Grootaert) ( RBINS).

Diagnosis. Recognised by brown antennae and palpi, entirely yellow legs and brown halteres; tergites 3–4 with squamiform setae laterally.

Description. Length: wing 1.8 mm. Male. Occiput black, subshining; with yellow setation; inner verticals long, inclinate. Ocellars moderately long, of subequal length, anterior pair inclinate and cruciate, posterior pair lateroclinate. Frons narrow, subshining. Antenna brown; postpedicel with upper margin straight and lower margin convex; nearly 2.0 times as long as wide; stylus subapical, long, nearly 3.5 times as long as postpedicel. Proboscis yellowish brown. Palpus brown, small, rounded, bearing scattered setulae, subapical seta short, thin.

Thorax black, shining, with pale setation. Prothoracic episterna without long upturned seta just above fore coxa and with several setulae on upper part. Postpronotal seta not prominent. Anepisternum (= mesopleuron) with numerous setulae on upper part. Mesonotum with 2 notopleurals, 1 postsutural supra-alar, 1 postalar and 4 scutellars (apical pair very long, cruciate; lateral pair minute); acrostichals and dorsocentrals undifferentiated, scutum evenly covered with numerous setulae, 1 pair of prescutellars long.

Legs quite robust, entirely yellow. Coxae and trochanters with unmodified setation. Fore femur with row of minute anteroventral and row of somewhat longer posteroventral setulae. Fore tibia lacking prominent bristles (except subapicals). Mid femur with row of minute anteroventral and stronger and darker posteroventral setae, 1 hardly prominent subapical seta anteriorly. Mid tibia lacking ventral spinules and prominent bristles (except subapicals). Hind femur with 1–2 moderately long anteroventrals subapically and some short erect dorsal setae near base. Hind tibia lacking prominent setae; apical projection small, rounded. Tarsi of all legs unmodified, with unmodified setation.

Wing normally developed, finely infuscate, somewhat darker on basal parts of cells r1 and r2+3. Costal bristle moderately long, brownish yellow. Costal index: 36/27/22. Vein R2+3 evenly bowed. Veins R4+5 and M1+2 divergent near wing apex, R4+5 slightly bowed, M1+2 slightly undulate. Crossvein bm-cu perpendicular. Crossvein r-m before middle of cell bm. Halter brown.

Abdomen. Tergite 1 pale, tergites 2–8 well sclerotised; tergite 2 with broad excision anteriorly; tergites 2–3 and 6–7 of subequal width viewed laterally; tergite 4 somewhat broader, tergite 5 narrow; tergites 3–4 with squamiform setae laterally (more distinctly on tergite 4), tergite 5 with intermixed unmodified and somewhat flattened setulae laterally; tergite 7 with short posteromarginal setae. Sternites well sclerotised, sternite 3 with shallow median excision posteriorly, sternites 4–5 divided; covered with minute setulae, sternite 8 with moderately long setae. Gland-like structure present between tergites 4–5. Terminalia ( Figs. 19–22 ) rather large, brownish. Cerci separated. Right cercus very long, mostly narrow, broadened and of complicated structure apically, overlapping hypopygium posteriorly, with short unmodified setae. Left cercus bilobed, with long rather digitiform left lobe narrowed basally; right lobe short, covered with unmodified setae of different lengths. Epandrium completely divided. Right surstylus small subtriangular. Left epandrial lamella fused to hypandrium, with several short setae apically. Left surstylus ( Fig. 22 ) with numerous unmodified setae. Phallus short. Two rod-shaped apodemes.

Female. Similar to male. Mid femur with minute yellow anteroventral and posteroventral setulae. Abdominal segment 7 strongly sclerotised, dark brown; segment 8 weakly sclerotised, tergite 8 with deep notch posteriorly. Cercus yellowish brown.

Etymology. The specific name “ zamba ” means “forest” in Lingala.

Distribution. D.R. Congo.

Remarks. Drapetis zamba sp. nov. is most similar to D. congoensis sp. nov. The main differences between these species are given in the key.

Figures

FIGURES 19 – 22. Drapetis zamba Grootaert et Shamshev sp. nov. 19. Right epandrial lamella; 20. Epandrium with cerci; 21. Right surstylus and right cercus; 22. Left surstylus.