Adapted from original description (Vockeroth 1969)
MALE.
Head: Facial tubercle rather broad, weak, indistinct above. Face, front, gena, and about lower fifth of occiput yellow, face with a rather narrow brown medial vitta which encompasses antennal bases, laterally slightly white pollinose, gena obscurely brownish below eye. Occiput and vertical triangle as in quadricornutum. Frontal triangle, and face to just below antennal bases, black pilose; remainder of face, and gena, white-haired. Antenna yellow-orange, basoflagellomere dark brown above; arista black.
Thorax: Scutum black, in holotype only obscurely vitatte (perhaps wetted), in paratype with dull bluish medial and submedial viitae, the former narrow anteriorly and broader posteriorly; between and beside the bluish vittae the scutum is densely opaque brown pollinose, only the extreme lateral margin of dark area opaque black. Scutum laterally with broad entire pale yellow vitta, not broader than humerus and only slightly broader than notopleuron, from about middle of notopleuron separated from mesonotal margin by a narrow opaque brown stripe which broadens posteriorly and covers about outer half of postcallus. Scutellum yellow with brown subshining basal triangle which is basally considerably broader than dark mesonotal margin, the yellow margin of almost uniform width throughout, extreme anteroventral angles of scutellum dark brown. Pleuron black, subshining, slightly grey pollinose, the yellow markings as in quadricornutum or even more extensive so that the medial third of the posterior anepisternum and anterior half of anepimeron are pale brown, the katepisternum except broad dorsal margin is blackish, the metaepisternum has a broad blackish streak extending anteroventrad from spiracle, and the rest of the pleura is yellow. Mesonotal pile on dark portion of disc dark brown to black with intermixed pale pile, on yellow margin yellow on anterior end of notopleuron, otherwise brown, becoming black on postcallus. Scutellar pile black, coarse and sparse, those on margin almost bristle-like. Pleural pile white. Subscutellar fringe black, sparse, absent on only about median 1/6. Dorsal katepisternaml pile patch triangular, only narrowly separated from the very small lower patch. metaepisternum without pile in front of spiracle. Metasternum with a few long pile. Wing with alula normal, gradually broadened almost to its apex. Wing with bare areas much as in quadricornutum but with cell R slightly more extensively, and cell CuP slightly less extensively, microtrichose. Stigma and subcostal cell brown. Legs brownish, coxae yellow to pale brown, femora and tibiae darkened apically, metatibia dark brown, tarsi blackened. Pile of legs mostly rather short and sparse, metafemur with slightly longer and stronger setose black pile anteroventrally and posteroventrally near apex.
Abdomen narrower than thorax, parallel-sided, with weak but broad margin on terga 3 and 4. Terga discoloured in both available specimens, mostly blackish with reddish tint and not clearly separated into shining and opaque areas, yellow markings as follows: narrow lateral margins of tergum 1; a pair of subbasal, broadly separated maculae on tergum 2 which broaden slightly laterally to join the very narrow obscure entire lateral yellow margin of the tergum; a narrow, entire, slightly arcuate, subbasal yellow fascia on each of terga 3 and 4; obscure lateral margins of tergum 5. Terminalia dark reddish-brown to black, sternum 8 with large shining area near base, terminalia otherwise dull. Sternita yellowish, without distinct markings.
Terminalia greatly enlarged; sternita 5 to 8 with only a very few short pile but with micropubescence long. Sternum 8 very large and protuberant but otherwise normal. Tergum 9 greatly elongated anteroposteriorly, the posterior portion extending far beyond the apices of the cerci, greatly broadened and produced dorsally into two stout, recurved, scarcely tapering, bluntly rounded processes. Cerci symmetrical. Surstylus attached along most of anterior half of lower margin of tergum 9, divided by a rather narrow and shallow ventral emargination into a narrower and flatter anterior lobe with thickened antero-ventral angle and a broader, convex, almost circular anterior lobe, the posterior lobe laterally with a dense patch of very long strong spine-like setae, the anterior lobe with similar but less closely spaced setae; the two surstyli of almost exactly the same shape but the anterior lobe apparently slightly larger in the left surstylus. Sternum 9 broadly and deeply emarginate so most of ventral surface is absent; apicolateral process broadened and curved dorsomediad to join the very short surstylar apodeme. Superior lobe directed caudad, moderately slender and compressed, the apical third turned sharply dorsad, with two strong anterior setae near base but otherwise bare. Aedeagal base cylindrical, ventral surface very short, dorsal surface much longer because of an anterodorsal prolongation, apical margin very slightly flared ventrally and laterally. Distal portion of aedeagus depressed, moderately broad, broadened apically, with an anteroventrally directed flange just beyond base of anterior surface, posterior surface sclerotized on about basal half, then greatly expanded as a semicircular, semimembranous, caudally curved lobe with minutely fimbriate lateral margins.
FEMALE.
Very similar to male, differing as follows: upper third of front subshining black, the black area extending narrowly forward along inner eye margins to about anterior 1/5 of front but broadly separated by a bright yellow inverted "V" from a large black supra-antennal triangle, the latter with subshining margins and strongly shining but poorly demarked base. Terga 2 to 4 with slightly less than posterior half of posterior black areas shining, submetallic; tergum 5 with more than half of posterior black area shining, remainder of dark areas opaque. Tergum 2 with yellow maculae apparently only narrowly separated. Tergum 5 with subbasal yellow fascia similar to that of tergum 4 but distinctly broadened laterally and apparently reaching the base of the tergum medially.
unless otherwise stated