4A. SYRPHID-E. 
a 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 seutellum is 
thick and twice as long as in picfa. Squamule and halteres as 
in picta. Abdomen shaped as in pieta; it is wholly yellow, 
with a black ring at the end of the second seoment, 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: Lees with the cox 
entirely pale yellow, without any dark marking. Wings as broad 
as in picta and of similar 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, 

Fig. 8.—Baccha grahami, sp.n. Q. X 5. 
leaving the alula and the hind border of the axillary cell almost 
hyaline ; the median brown band 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 ena ot the 
fourth vein; the hind border of the w ings is infuscated from the 
tip to the ead of the axillary cell. The veins are black, but yellow 
in the yellow portions of the wing. 
Type 2 on another specimen from Obuasi, Ashanti, vi.—viil. 
1907 (Dr. M. Graham). Named in hemear of the collector, 
who has ba ered so many interesting new species of West African 
Diptera. 
38. Baccha helva, sp. n. 
9. Length of body 13 mm., of wing 11 mm. 
Near picta, but more robust, without black stripes on the thorax, 
