Drapetis congoensis 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 : 14-15

Drapetis congoensis Grootaert et Shamshev sp. nov.

( Figs. 13–15 )

Material examined. HOLOTYPE, 3 labelled: D.R. CONGO, Kona , 13 May 2010, primary swamp forest (reg. 30038, leg. P. Grootaert; MS name Drap2); Holotype / Drapetis congoensis / Grootaert et Shamshev sp. nov. [ RBINS].

Diagnosis. Recognised by brown antennae, conical postpedicel, brownish yellow palpi; hind femora entirely brown, hind coxae and tibiae with basal three-quarters yellowish brown; abdominal tergites lacking squamiform setae but with patch of dense microtrichia laterally.

Description. Male. Length: body 1.2 mm, wing 1.1 mm. Occiput black, pollinose, viewed laterally rather subshining; with black setation; inner verticals long, inclinate. Ocellars of different length, anterior pair short, inclinate and cruciate; posterior pair moderately long, lateroclinate. Frons narrow, pollinose. Antenna brown; postpedicel conical; 2.3 times long as wide; stylus apical, long, 2.7 times long as postpedicel. Proboscis yellowish brown. Palpus brownish yellow, small, rounded, bearing scattered setulae, subapical seta short, thin.

Thorax black, shining, larger bristles brown. Prothoracic episterna without long upturned seta just above fore coxa, with several setulae on upper part. Postpronotal seta not prominent. Anepisternum (= mesopleuron) with several setulae on upper posterior corner. 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, 3 pairs of prescutellars long (becoming longer toward scutellum).

Legs quite robust, largely yellow, hind femur entirely brown, hind coxa and hind tibia on about basal 3/4 yellowish brown. 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 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. Costal bristle moderately long, brown. Costal index: 21/9/21. Vein R2+3 strongly curved. Veins R4+5 and M1+2 divergent near wing apex, both slightly bowed. Crossvein bm-cu perpendicular. Crossvein r-m before middle of cell bm. Halter brown.

Abdomen. Tergite 1 narrow, divided medially; tergites 2–3 of subequal width, with unmodified setation; tergite 4 broader, dark brown, without squamiform setae but with patch of dense microtrichia laterally; tergite 5 very narrow, with unmodified setation; tergite 6 nearly as broad as tergites 2 and 3 but very weakly sclerotised, with scattered setulae; tergite 7 nearly as broad as tergite 4, with short posteromarginal setae. Sternites well sclerotised, sternites 3–4 broadly divided medially, bearing scattered setulae. Gland-like structure present between tergites 4–5. Terminalia ( Figs. 13–15 ) rather large, brown. Cerci narrowly fused; right cercus digitiform with 2 long apical spines and 2 shorter spines basally, otherwise with numerous unmodified setae of different lengths; left cercus rather digitiform, curved, somewhat longer than right cercus, bearing 2 short subbasal spines, with numerous unmodified setae of different lengths; hypoproct not prominent. Epandrium completely divided. Right surstylus hardly separated from epandrial lamella ( Fig. 13 ), covered with unmodified setae. Left epandrial lamella fused to hypandrium, with 2 short setae apically. Left surstylus ( Fig. 15 ), represented by 2 sclerites, dorsal sclerite long, digitiform, with 2 spine-like subapical setae and some unmodified setae. Phallus short. Two rod-shaped apodemes but ejaculatory apodeme long ( Fig. 14 ).

Female. Unknown.

Etymology. The name refers to its occurrence in the D.R. Congo.

Distribution. D.R. Congo.

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

Figures

FIGURES 13 – 15. Drapetis congoensis Grootaert et Shamshev sp. nov. 13. Right epandrial lamella; 14. Epandrium with cerci; 15. Left surstylus.