Related to Mixogaster breviventris Kahl but with longer and much narrower second abdominal
Adapted from original description (Curran 1932).
Head reddish yellow; a large macula on either side of the lower part of the front, a triangle extending from the ocelli to the vertex and the occiput, except above and below, black; the ocellar area sometimes surrounded by a large brown macula. A median facial vitta and a supra-antennal rectangle wine-red, the lunule black. Occiput cinereous pollinose. Pile yellowish, black on the front, the sides of the front sometimes broadly yellow-haired above, the middle with a broad, transverse bare fascia. Face almost perpendicular, with a convexity just below the antenne, the lower half very gently convex. Basoflagellomere as long as the face, twice as long as the basal two segments combined, rather strongly constricted on the sub-basal third; scape and basoflagellomere brown, the pedicel and basal half of the basoflagellomere reddish yellow; arista reddish yellow, much shorter than the basoflagellomere. Front a little wider than the face.
Thorax: Scutum brown, the sides broadly yellow; pile reddish yellow, mostly black on the dark portion behind the suture. Pleura brownish red; the mesopleura mostly, a very large katepisternal macula, and most of the meron yellow. Pectus and metanotum brownish black. Scutellum wholly yellow, with short, sparse, reddish-yellow pile. Legs reddish yellow, the coxae, trochanters, and broad bases of the femora brownish. Pile reddish yellow. Wings with luteous tinge, yellowish brown in front of the vein R4+5, the apex darker, the costal cell paler. Apex of the cell R4+5 almost transverse, the cell DM about as long behind as anteriorly, vein M1 conspicuously curved inward and somewhat angular on its middle portion, sometimes emitting an appendix of vein into the cell DM; usually appendix of vein projecting into the cell R4+5 from the fourth vein a little before the end of the cell DM. Calypter linear, brown. Halteres reddish.
Abdomen black, ferruginous, and yellow. First and second segments fused, ferruginous, the first broadly yellow on the sides, the second with the apex broadly yellow; third segment with the apical third or more, yellow; the fourth with a broad, apical, pale band. Genitalia broadly yellow apically, brown above and below. Pile black, reddish yellow on the pale portions and the broad apex of the abdomen. Venter concolorous with the dorsum. Second abdominal segment narrowest at the middle, gently widening toward either end, third widening from the base to the apical third, the fourth with almost parallel sides. Second and fourth segments of about equal length, much longer than the third.
Face less distinctly convex above; third antennal segment somewhat shorter and broadened on less than the apical half; second abdominal segment shorter and widening from near the base, the fifth segment with a yellow posterior border.
Body lenght: 9-12 mm.
Species with a very reduced distribution; only known from Cuba.