Adapted from original description (Vockeroth 1969).
MALE.
Head: Facial tubercle rather strong, distinct above and below. Face, lateral margins of front, gena, and about ventral fifth of occiput yellow, face with a narrow black median vitta which narrows to a point just above oral margin and extends dorsad between antennae to join a wider black frontal triangle which extends about 2/3 length of front and has a triangular lower portion sharply demarked and shining. Occiput and vertical triangle as in quadricornutum. Front, and face beside antennal bases and along lower part of tubercle, black pilose; remainder of face, and gena, yellow pilose. Antenna yellow-orange, all segments dark brown on about dorsal half; arista dark brown.
Thorax: Scutum with disc opaque black (probably wetted - see description of female below); laterally with broad yellow vitta from anterior margin of postpronotum to scutellum, behind suture separated from lateral margin by a narrow obscure brownish lateral vitta which does not extend onto postalar callus. Scutellum yellow with brown basal triangle which is not wider than black portion of scutum, yellow scutellar margin wider laterally than posteriorly, extreme anteroventral angles of scutellum black. Pleura mostly pale yellow, a broad vertical vitta on middle of anepisternum and lower portions of katepisternum and meron (hypopleuron) reddish, the anterior haired portion of anepimeron and posteroventral corner of hypopleuron (metaepisternum) blackish. Scutal hairs mostly yellow, those on lateral brownish postsutural margin brown, those on postcallus and immediately in front of scutellum black. Scutellar hairs black, coarse and sparse, those on margin almost bristle-like. Pleural hairs pale yellow. Subscutellar fringe black, sparse, almost complete. Dorsal katepisternal pile patch triangular, extending ventrad to join very small ventral patch. Meron without hairs in front of spiracle. Metasternum with a few long hairs. Wing with alula normal, gradually broadened almost to its apex. Wing membrane with rather extensive bare areas as follows: extreme base of cell R1 most of first basal cell from base of spurious vein to level of posterior crossvein, second basal cell except posterolateral portion and extreme apex, most of basal half and narrow anterior margin of alula, a moderate area in front of basal half of vein A2, and a narrower area behind vein A2. Stigma dark brown, subcostal cell brown. Legs with coxae and basal portions of pro- and mesofemora yellow, pro- and mesolegs becoming progressively darker apically, their tarsi black; metatrochanters yellow on basal half, brown on apical half; metafemora brown at extreme base, metaleg otherwise black. Mesofemur with rather strong black posterior hairs, subequal to femoral diameter, on apical 2/3; metafemur with strong black anteroventral and posteroventral hairs which become stronger and almost bristle-like near apex, those on about apical sixth of posteroventral surface particularly strong and dense and about half as long as femoral diameter; hairs of legs otherwise rather short and sparse.
Abdomen narrower than thorax, very slightly constricted, narrowest at end of segment 2, with narrow but distinct margin on terga 3 to 5. Markings of terga as in bicornutum but yellow band of tergum 4 more strongly broadened laterally. Anterior margin of tergum 2 and about posterior fifth or slightly less of terga 2 to 4 shining, remainder of terga apparently dull. Sterna yellowish, rather discoloured.
Genitalia greatly enlarged. Sternites 5 to 8 with only a very few short hairs but without elongate micro-pubescence. Sternite 8 with a very long, rather slender, sub cylindrical dorsal process, with a short stout posterodorsal process and with a short stout anterolateral process. Tergite 9 not greatly enlarged but elongate anteroposteriorly and produced caudad beyond apices of cerci to form a rather broad, slightly depressed, bluntly rounded lobe on each side, the lobes curved slightly ventrad and meeting basally behind the apices of the cerci. Right cercus very slightly longer than left cercus. Surstylus attached along posterior part of anterior half of ventral margin of tergite 9. Left surstylus clearly divided into posterior and ventral lobes; posterior lobe compressed, shallowly emarginate apically, and with long moderately strong setae apically and on outer surface; ventral lobe thickened basally, compressed and oblique apically, broadly rounded at apex, with a few short setae on outer surface and many short stout curved setae on inner surface; anterior margin of surstylus, at junction of lobes, broadened and concave. Right surstylus similar to left but with posterior lobe tapering to an oblique truncate bare apex, the setae long but weak and all concentrated on and below a distinct lateral tubercle near base of lobe; ventral lobe much larger than in left surstylus, curved caudad with anterior margin very long and distinctly thickened except at apex, the setae of outer surface longer and more abundant, those of inner surface as in left surstylus. Sternite 9 very broadly and deeply emarginate so ventral surface is completely absent, in profile extremely broad especially anteriorly, apicolateral process curved posteromediad to join surstylar apodeme. Superior lobe broadly articulated along posterior portion of ventrolateral margin of sternite, moderately compressed, its base elongate but very low, attached posteriorly to posterolateral surface of aedeagal base, produced abruptly posteroventrad at anterior end into a long slender process with compressed, laterally curved, bluntly rounded apex; distal half of process with a few very short setae on outer surface. Right superior lobe absent in only available specimen, presumably broken off. Aedeagal base triangular in profile, rounded dorsally but with distinct posterodorsal groove, broadened and widely open anteroventrally except along upper margin, the opening almost filled by base of distal portion of aedeagus. The latter distinct from, but rigidly fused to, aedeagal base, strongly sclerotized throughout, curved anteroventrad and then posteroventrad, subcylindrical but with anterior angle somewhat flattened, and distal portion slightly compressed, the extreme apex strongly flared posteriorly and laterally, with slightly irregular margin and with distinct triangular anteroventral emargination.
FEMALE.
Very similar to male, differing as follows: black supraantennal mark extended broadly dorsad to ocellar triangle so that lateral yellow markings are separated from one another. Dark portion of disc of scutum with broad lateral margin mostly opaque black, subshining, and slightly brownish only presuturally, with broad, posteriorly convergent, sub-median vittae shining blue-green, and with broad median vitta subshining brown. Pleura mostly yellow, only anterior part of anepimeron and lower parts of katepisternum and meron obscurely reddish. Abdomen not constricted, almost parallel-sided, broadest at end of tergum 3. Abdominal markings bright and sharply defined; tergum 5 with markings similar to those of tergum 4 but with fasciae much narrower; shining areas of terga bluish, almost metallic. Terga 6 to 8 black, strongly shining.
Citrogramma sedlacekorum Vockeroth, 1969.
Vockeroth, J.R. (1969). A revision of the genera of the Syrphini (Diptera: Syrphidae). Memoirs of the Entomological Society of Canada 62, 176 pp.
unless otherwise stated