Carreramyia megacephalus Shannon, 1925:213

Carreramyia was established for a Ubristes species with a furcate basoflagellomere in the male; females have a normal elongate basoflagellomere. Ubristes megacephalus also differs from other Ubristes species in having the vertex greatly enlarged and metabasitarsomere enlarged and quadrate.

Ubristes (Carreramyia) megacephalus (Shannon).

Shannon, R.C. (1925) An extraordinary adult myrmecophile from Panama. Journal of the Washington Academy of Sciences 15, 211-213.

Adapted from original description (Shannon 1925).

MALE.

A small golden yellow species with dark mesonotal markings.

Head very large, noticeably broader than high; eyes nearly twice as long as wide, very slightly approaching above; face very broad, widening upwards, to near top of eyes; ocellar tubercle very prominent, ocelli closely grouped; the triangle broader than long; scape slender, about as long as distance between antennal base and eye margin; pedicel very small; basoflagellomere nearly four times as long as scape, very broad basally and sheet-like, with an incision extending nearly to its base, dividing it into two branches, each branch tapering to a point; front and face golden yellow, a blackish line extending across ocelli from eye to eye which is clothed with black, short, coarse pile; a similar dark line looped around antennal base; facial pile very sparse, golden; mouthparts somewhat reduced.

Thorax very small, much smaller in dorsal aspect than frontal aspect of head; with three broad blackish stripes; scutellum yellow; thoracic pile very sparse, coarse, reddish yellow. Legs entirely yellow; pro- and mesolegs slender and with yellow pile; metalegs more or less swollen throughout; the tibia along the dorsal surface with densely matted, long black hairs. Wings hyaline; stigmatical crossvein present; spurious vein nearly obsolete; vein R4+5 simple; vein M1 nearly straight, slightly directed basally, making apex of cell R4+5 nearly quadrate.

Abdomen deep golden with sparse, coarse, golden pile; four-segmented, the fourth nearly as long as first three combined; hypopygium remarkably enlarged, globose, with coarse black hairs.

Shannon (1925) described this species as Microdon megacephalus, but Doesburg (1966) created a new genus for it, Carreramyia. Cheng and Thompson (2008) considered the taxon as a subgenus of Ubristes.

Body length: 7 mm.; wing: 5.5 mm.; third antennal joint: 2.75 mm.; width of head: 2.75 mm.; width of thorax: 2 mm. (Shannon 1925).

Holotype male collected in Panama.