Drapetis denticulata, Grootaert & Shamshev, 2014

Grootaert, Patrick & Shamshev, Igor, 2014, New Tachydromiinae (Diptera: Empidoidea: Hybotidae) from different types of forests along the Congo river (D. R. of the Congo), Belgian Journal of Entomology 18, pp. 1-34 : 1-34

Drapetis denticulata sp. nov.

( Figs 4–6 )

ETYMOLOGY. The specific epithet refers to the denticulate inner left surstylar appendage.

TYPE MATERIAL. Holotype, ♂: D. R. CONGO, Kinshasa, 3 June 2012 (Park, Hotel Invest Presse), (reg. 32001, leg. P. Grootaert, MS reference Drap 5) ( RBINS). Mid leg in tray Congo 2 at F1 was extracted for DNA and a COI barcode is available at GenBank.

DIAGNOSIS. Small species with brown antenna and palpus; legs robust, largely yellow, hind femur brownish yellow towards apex, mid and hind tibiae (except base) and tarsi of all legs brownish; hind tibia without bristles; halter with yellow knob.

DESCRIPTION.

Male. Occiput black, pollinose, viewed laterally rather subshining; with longer setae brownish; inner verticals long, inclinate. Ocellars of different length, anterior pair moderately long, inclinate and cruciate; posterior pair very short, lateroclinate. Frons narrow, above antennae narrower than anterior ocellus, widened toward ocellar tubercle, subshining. Antenna brown; postpedicel conical, with lower margin convex; 2.0 times as long as wide; stylus apical, long, 4.3 times as long as postpedicel. Proboscis brown. Palpus brown, small, rounded, bearing scattered setulae, subapical seta short, thin.

Thorax black, shining, larger bristles brownish. Prothoracic episterna without long upturned seta just above fore coxa, with several setulae on upper part. Postpronotal seta not prominent. Anepisternum (= mesopleuron) with numerous setulae on upper part. Mesonotum with 2 notopleurals, 1 postsutural supra­alar, 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 robust, largely yellow, hind femur rather brownish yellow towards apex, mid and hind tibiae (except base) and tarsi of all legs brownish (somewhat darker on hind leg). Coxae and trochanters with unmodified setation. Fore femur with rows of minute anteroventral and posteroventral setulae, 1 long thin seta near base and some longer and stronger setulae dorsally on subapical part. Fore tibia lacking prominent bristles (except subapicals). Mid femur with rows of minute anteroventral and posteroventral setae, 1 moderately long subapical seta anteriorly. Mid tibia lacking ventral spinules and prominent setae (except subapicals). Hind femur with 2–3 moderately long anteroventrals subapically and some short erect dorsal setae near base. Hind tibia lacking prominent setae, with longer setulae dorsally; apical projection small, rounded. Tarsi of all legs unmodified, with unmodified setation.

Wing normally developed, finely infuscate. Costal bristle moderately long, brown. Costal index: 44/15/23. Vein R 2+3 rather strongly curved. Veins R 4+5 and M 1+2 divergent near wing apex, both slightly bowed. Crossvein bm­cu somewhat oblique. Crossvein r­m before middle of cell bm. Halter with yellow knob and darkened stem.

Abdomen. Tergite 1 pale, otherwise tergites brown; tergites 2–3 of subequal width (viewed laterally), with ordinary setae; tergite 4 broadest, with squamiform setae laterally; tergite 5 very narrow dorsally, with ordinary setae; tergites 6–7 of subequal width, with ordinary setae, tergite 7 with short posteromarginal setae. Sternites well sclerotised, undivided, sternites 3–6 broadly convex posteriorly, bearing scattered setulae. Gland­like structure present between tergites 4–5. Terminalia ( Figs 4–6 ) moderately large, brown. Cerci separated; right cercus moderately broad, digitiform, with ordinary setae of different lengths; left cercus somewhat narrower but longer than right cercus, with ordinary setae of different lengths. Epandrium completely divided. Right epandrial lamella elongate ovate, with ordinary setae; right surstylus elongate, narrowed toward apex, with short ordinary setae. Left epandrial lamella fused to hypandrium, lacking setation apically; left surstylus large, subglobular, with ordinary setae. Phallus short. Two rod­shaped apodemes.

Length (mm). Body 2.2, wing 1.8.

Female unknown.

COMPARISON. The new species is similar to D. congoensis Grootaert & Shamshev, 2013 differing primarily by largely yellow hind femur (cf. hind femur entirely brown in D. congoensis ).

DISTRIBUTION. D. R. Congo.

Figures

Figs 4–6. Drapetis denticulata sp. nov., 4. Right epandrial lamella, lateral view; 5. Terminalia, dorsal view; 6. Left surstylus, lateral view.