Wyatt, N.P. (1991) Notes on Citrogramma Vockeroth (Diptera: Syrphidae) with descriptions of five new species. Oriental Insects 25, 155-169.
Citrogramma flavigenum Wyatt
Species similar to Citrogramma henryi, but without the black macula on genal groove, ventrad to eyes. Citrogramma flavigenum has gena yellow, scutellum with a diffuse brownish macula not always present, metafemur black, and pro- and mesofemur black on basal 1/4-1/3. Citrogramma flavigenum differs from C. pennardsi and C. schlingeri by the angle between eyes, which is less than 90° in C. flavigenum.
Citrogramma flavigenum differs from C. citrinoides by the coloration of pro- and mesofemur, being completely yellow in C. citrinoides. Lunule is yellow in C. citrinoides, but dark in C. flavigenum.
Adapted from original description (Wyatt 1991).
Head with a small but sharply defined facial tubercle, face only moderately produced. Face and frons almost entirely yellow, but brownish on facial tubercle and with a blackish lunule. Antennae blackish on basal two segments, basoflagellomere brown with only a small orange area in the ventral basal corner. Eyes with angle of separation of inner margins relatively narrow, slightly less than a right angle; confluent for a distance that is slightly shorter than that between point of eye margin separation and antennal bases, when viewed from above. No black area present between lower eye margin and mouth.
Thorax with dark scutum almost uniformly dusted brown, becoming blacker laterally adjacent to lateral yellow vitta; pile mostly black but with a few pale hairs intermingled medially. Pleura yellow, except posterior anepisternum black on anterior 1/2 and anepimeron black. Scutellum yellow with diffuse darker median area, pile entirely black. Halteres completely orange, calypter pale creamy yellow with fringe mostly pale, but darker on basal half. Legs: Tibiae and femora of pro- and mesolegs yellow but black on basal 1/3 of femora. Otherwise legs black except for dull orange on pro- and mesobasitarsi. Long posterior pile on pro- and mesofemora, and on anterior of metafemur black. Wing membrane with pale golden brown hue, more richly so on stigma; membrane completely covered in microtrichia.
Abdomen black with yellow markings as follows: tergum 2 with a pair of large "golf club" shaped maculae, laterally narrowed and extended forwards to anterior corners of tergum; tergum 3 with a broad fascia incised medially and laterally on its posterior margin; tergum 4 similarly marked but fascia less incised posteriorly; tergum 5 with a broad fascia somewhat narrowed medially.
C. flavigenum is very similar to C. chola and it would not be a surprise if finally they are considered synonyms.
Body length: 10.0 mm.
Species found in southern India, in the states of Tamil Nadu, Karnataka and Kerala.