Citrogramma fascipleura (Curran, 1931):352

Citrogramma fascipleurum has a shaped triangular black macula on scutellum, pro- and mesofemur entirely yellow and metafemur black; but it is very similar to Citrogramma gedehanum and C. difficile. Differences with C. gedehanum and C. difficile are few: facial and notopleural pilosity black, and posterior anepimeron yellow in males. The females of C. fascipleurum have yellow lunule and the posterior anepimeron is yellow. The distribution of C. fascipleurum overlaps with that of C. difficile.

Holotype is not in very good condition with abdomen glued to a label and right wing broken. The female from Mt Dulit, previously identified as C. difficile (Wyatt 1991), has been identified as C. fascipleurum (Mengual 2011) because both specimens share the same pleuron pattern with anepimeron yellow except a dorsal black macula on anterior section. The other morphological character that distinguishes them from C. difficile is the presence of black pile on notopleuron.

Synonyms: Syrphus fascipleura Curran, 1931a: 313 (key), 1931b: 352 (descr.); Citrogramma fascipleura of Knutson et al., 1975: 311 (cat. cit.) ; Wyatt 1991: 155 (cit.), 158 (ident. key); Citrogramma difficile of Wyatt, 1991 (in part).

Citrogramma fascipleura (Curran, 1931).

Curran CH. 1931b. Records and descriptions of Syrphidae from North Borneo including Mt Kinabalu. Journal of the Federal Malay States Museums 16, 333-376.

Adapted from original description (Curran 1931).

MALE.

Head: Face and gena yellow, gena blackish above and thinly grayish pollinose. Face at oral margin less prominent than at base of antennae; middle of face swollen, but with a low, nasiform tubercle, scarcely concave above. Frontal triangle reddish-yellow, more orange in front. Vertical triangle small, greenish-black, brownish pollinose and black pilose. Occiput yellow pollinose, clothed with shining yellow pile except above. Pile of the face yellow except above, of the frontal triangle and anterior half of the gena, black. Antennae brownish-red, basoflagellomere broadly black above, one-fourth longer than wide, convex below, evenly rounded apically; arista blackish.

Thorax: Scutum opaque, the median third greenish-gray, bordered laterally and posteriorly by black, the lateral margins broadly pale yellow. Dorsal two-thirds of pleura pale yellow, except posterior anepisternum black on anterior 2/3 and anterior anepimeron black. Pile reddish-yellow; black on the opaque black part of the scutum. Scutellum yellow with a large, subtriangular brown macula resting on the base and rounded apically; pile wholly black, including the ventral fringe. Legs: Anterior four legs reddish-yellow, the tarsi black; metalegs wholly black. PIle black except on the bases of the femora. Wings cinereous hyaline; stigma yellowish-brown. Squamae yellow, with dark border and more or less black or brown fringe.

Abdomen black and reddish-yellow. Tergum 1 bordered laterally and anteriorly with yellow. Tergum 2 with a pair of large, subtriangular pale maculae which are rounded inwardly, oblique on the outer edge and produced broadly to the anterior corners, their posterior, gently convex edge at the posterior third of the tergum. Pale fascia on third tergum gently concave in front, separated from the base of the segment by more than half its median width, but almost reaching the base where it extends broadly over the lateral margins; fascia narrowest in the middle. Pale fascia on fourth tergum similar to that on the third but a little narrower, situated closer to the base of the segment and extending more broadly over the lateral margins. Sides of fifth tergum broadly reddish except on the narrow base. Pile black, on the sides of the first tergum and the disc of the second in front of the black fascia, reddish-yellow. Sterna reddish-yellow, the second and following sterna very broadly black apically.

Species collected in Borneo, Sabah and Sarawak Provinces (Indonesia).