Corononcodes Speiser, 1920

Barraclough, D. A., 2001, A review of the South African species of Corononcodes Speiser (Diptera: Acroceridae), African Invertebrates 42, pp. 95-104 : 97

Key to the South African species of Corononcodes Speiser

1 Ocellar tubercle prominently developed, height about half to three-fifths that of head. Gena conspicuous in profile, depth subequal to length of scape. Lower calypter with dense white pruinosity covering entire surface. Wing with vein R 4+5 reaching margin [eastern Northern Cape] ..................................... coronatus Speiser, 1920

- Ocellar tubercle less strongly developed, height about one-fifth to one-quarter that of head. Gena ranging from barely visible to fairly prominent in profile, depth at most two-thirds length of scape. Lower calypter either without white pruinosity or this broadly present on outer margin only. Wing vein R 4+5 not reaching margin ................................................................................................................... 2

2 Eye with pile reduced in both sexes, length of vertical band of hairs at dorsomedial extremity at most 1.5 times width of scape apex. Gena barely visible in profile. Male flagellum noticeably shorter than eye depth in profile [Eastern Cape] .............................................................. homalostemma Barraclough, 1984

- Eye with pile over entire surface of eye or restricted to a vertical band of hairs at dorsomedial extremity, with length of band about 3.0 times width of scape apex. Gena slightly to fairly prominent in profile. Male flagellum noticeably longer than eye depth in profile ............................................................................................... 3

3 Eye with pile covering virtually entire surface; pile on eye and occiput yellow to pale brown ( Figs 1 & 2 ). Gena fairly prominent in profile, depth 0.5–0.7 times length of scape ( Figs 1 & 2 ). Proepisternum haired ventrally. Scutal region between postalar calli and anterior to scutoscutellar suture haired. Wing veins mainly medium to dark brown. Vein M 3 incomplete, not originating from basal crossvein ( Figs 4 & 5 ). Lower calypter without pruinosity on upper surface.Haltere knob medium brown. Tibial spur comprising row of 7–10 tooth-like projections, with one better developed than the others [western Northern Cape] ..................................... dimorpha sp. n .

- Eye with pile restricted to a vertical band of hairs at dorsomedial extremity, length of band more than 3.0 times width of scape apex; pile on eye and occiput white ( Fig. 3 ). Gena slightly visible in profile, depth 0.2–0.3 times length of scape ( Fig. 3 ). Proepisternum bare ventrally. Scutal region between postalar calli and anterior to scutoscutellar suture bare. Wing veins mainly cream. Vein M 3 complete, originating from basal crossvein ( Fig. 6 ). Lower calypter with white pruinosity on outer margin of upper surface. Haltere knob white or pale yellow. Tibial spur comprising mainly a single, large, hook-like structure [KwaZulu-Natal Drakensberg] ................................................................................ manningi sp. n .

Figures

Figs 1–3. Corononcodes species, head profiles, showing details of all vestiture (note eye pile). 1. C. dimorpha sp. n., male. 2. C. dimorpha sp. n., female. 3. C. manningi sp. n., male.

Figs 4–6. Corononcodes species, wing, showing shape and venation. 4. C. dimorpha sp. n., male. 5. C. dimorpha sp. n., female (note: anal region folded upwards). 6. C. manningi sp. n., male.