QHAPTOMTZA. 57 



on account of the good preservation of the material collected by 

 Dr. Graham, while the specimens on which I founded these species 

 were badly preserved. Bigot described the arista as bare ; but 

 this is an error, due to the fact that the hairs are easily abraded, 

 like those on the eyes ; in reality, the arista is shortly plumose, as in 

 the other species. 



G. penfaspila corresponds to the female, which is larger and in 

 which the third and fourth abdominal segments have the median 

 black spot divided into two by a narrow yellow line ; G. melanura 

 corresponds to the male, which is smaller and has only a triangular 

 black spot on the third segment, while the fourth is entirely black. 

 The mesopleurae have in both sexes a perpendicular yellow band, 

 attenuated below and in continuation with the sutural band. 

 The bristles on the thorax and scutellum, and the scutellum 

 itself are as in the following species. The four anterior legs, 

 including the front coxae, are entirely pale yellow ; hind legs with 

 black coxae, the femora with the apical half abruptly shining black, 

 the tibiae black, densely clothed with hairs, the tarsi yellow. The 

 first joint of the tarsus of the middle legs of the male is simple, 

 cylindrical, and almost as long as the other joints together. The 

 hind tibiae bear stout black bristles placed in a row along the ex- 

 ternal fore border, which are more developed in the female. In the 

 wings, the bristles on the second vein run from the base to its 

 bifurcation, those on the fourth vein are present only on the portion 

 before the cross- vein dividing the second basal from the discal cell ; 

 but these bristles seem to be also easily abraded. There are on the 

 wings three brown cross-bands; the first very short below the stigma, 

 not passing the second vein ; the second broader, extending beyond 

 the hind cross-vein ; the third smaller, passing the subapical cross- 

 vein. 



Five males and two females from Obuasi, Ashanti, v.-xi. 1907, 

 caught on window or in bush (Dr. W. M. Graham). 



51. Graptomyza xanthopoda, sp. n. 



2 . Length of body 6 mm. 



A small species, closely allied to the preceding one, but distin- 

 guished by having a bare fourth vein, less distinct median abdominal 

 spot, wholly yellow hind legs, and broadly spotted wings. 



Head shining black, the occiput almost without any tomentum ; 

 frons broad, flat, with a keel and a round small fovea on each side 

 in the middle ; the frons is clothed with almost yellowish hairs, 

 which become darker over the antennae, and is black with four 

 subquadrate yellow spots, two near the ocelli and two on the sides 

 of the slightly prominent supra-antennal tubercle, all these four 

 spots being in contact with the eyes : face shining yellow, mode- 

 rately produced, with yellowish hair, and three ill-defined brownish 

 stripes, one in the middle and one on each side ; peristoma yellow, 

 with whitish hair behind ; vertical fringe yellowish ; eyes clothed 

 with short whitish hairs ; antenna? black, the very elongate third 



