Citrogramma solomonensis Wyatt, 1991:162

Species with a black facial vitta, wing entirely microtrichose, scutum with broad lateral yellow vitta, scutellum yellow with a black macula, katepisternum with a dorsal large yellow macula, and pro- and mesofemur yellow. Citrogramma solomonense is similar to C. hervebazini but C. solomonense has yellow gena with a black macula on genal groove, halter entirely yellowish, notopleuron and supra-alar area yellow pilose, and small male genitalia.

Citrogramma solomonense Wyatt, 1991.

Wyatt, N.P. (1991) Notes on Citrogramma Vockeroth (Diptera: Syrphidae) with descriptions of five new species. Oriental Insects 25, 155-169.

Adapted from original description (Wyatt 1991).

MALE.

Head: Face and frons yellow, with a black median vitta extending from mouth to antennae and above to form a supra antennal black triangle on the frons. Sides of face with distinct whitish dusting adjacent to eye margins, lateral pile of face entirely pale. Facial tubercle moderately produced, face somewhat swollen on lower half. Antennae orange with basal two segments and dorsal margin of basoflagellomere darkened, arista entirely dull orange-brown. Eyes bare with upper facets enlarged, especially close to inner eye margins. Eyes confluent for a distance that is slightly less than that between the point of eye margin separation and the antennal bases, when viewed from above.

Thorax with pale median area of scutum submetallic bluish grey, more or less distinctly divided into three vittae. Pile of scutum pale along yellow lateral vitta and on median submetallic area, otherwise black. Yellow area of pleurae interrupted by sharply defined black areas on the anepimeron and on the median third of the anepisternum. Scutellum pale yellow with a broad basal sharply defined black triangle. Halteres entirely orange, squamae whitish except darkened on posterior third, fringe mostly dark. Legs: Pro- and mesolegs with tibiae and femora entirely orange-yellow; tarsi, trochanters and coxae blackish; metaleg completely blackish. Wing membrane pale brown, completely microtrichose, stigma more richly golden-brown.

Abdomen black with paired yellow maculae on tergum 2 broadly overlapping the lateral margin of the tergite; terga 3 to 5 with almost uniformly broad yellow fasciae; almost occupying half the tergal length of terga 3 and 4. Hypopygium black.

Body length: 10-10.5 mm.

Citrogramma solomonense was firstly described from Solomon Islands, but it has been also collected in Papua New Guinea (Boungainville and New Britain islands).