37. Baccha grahami, sp. n..
♀ Length of body 9 to 10 mm., of wing 8 to 9 mm
A very elegant species near picta, but at once distinguishedvery by the very different very wing-pattern, yellow basally, with a broad median brown band, and hyaline apically, with a brown band at the tip.
Head as in picta, both in shape and coloration;
antennae orange-yellow with;
eyes apparently with a single brown band;
occiput bearing complete fringe of rigid and glittering yellowish hair.
Thorax wholly yellow, with only three parallel black stripes in the centre;
the yellowish-grey erect hair on the back and scutellum is thick and twice as long as in picta.
Squamulae and halteres as in picta.
Abdomen shaped as in picta; it is wholly yellow, with a black ring at the end of the second segment.
a black longitudinal stripe from the base of the third segment to the end of the abdomen, and a short oblique black streak on the hind corners of the third and fourth segments;
hair rather long, that on the spatulate portion also long and dark.
Legs with the coxae entirely pale yellow, without any dark marking.
Wing as broad as in picta and of simular shape; third vein only slightly sinuous, and the seventh likewise, the anal cell therefore almost regular at the apex; Wings yellow from the base to the small cross-vein, leaving the alula and the hind border of the axillary cell almost hyaline; the median brown dand begins at the fore border a little before the end of the auxiliary vein and goes perpendicularly to the hind margin, where it ends at the apex of the third posterior cell; subcostal cell filled up with brown to the extreme end; apical brown band running from the end of the first to the end of the fourth vein; the hind border of the wings is infuscated from the tip to the end of the auxillary cell. The veins are black, but yellow in the yellow portions of the wing.
Type ♀ and another specimen from Obuasi, Ashanti, vi-viii 1907 (Dr. W. M. Graham) Named in honour of the collector, who has discovered so many intresting new species of West African Diptera.
unless otherwise stated