African Pldehotmuc Diptera. 225 



elephant-fly, but I shot an elephant in the vicinity, and saw 

 no biting flies at all on or near it." 



Tabanus denshainii is allied to T. nyasa, Ricardo (Ann. & 

 Mag. Nat. Hist. ser. 7, vol. vi. 1900, p. 161:— syn. 71 tar- 

 salis, Adams, Kansas Univ. Sc. Bull. vol. iii. (xiii.) 1905, 

 p. 151), the type of which is from British Central Africa. 

 7\ nyasce, however, is distinguished by its more hyaline 

 wings, less deeply suff'used veins, the costal border to end of 

 first vein being merely tawny instead of dark brown, absence 

 of infuscation at the base of the upper branch of tlie third 

 vein, much larger lateral abdominal spots, narrower median 

 triangles on the abdominal segments, and paler femora and 

 tibiae. 



Tabanus welbnanii, sp. n. 



? . — Length (6 specimens) 11*25 to 12-3 mm. ; width of 

 head 4 to 4-5 mm. ; width of front at vertex 05 mm. ; 

 length of wing 10 to ITS mm. 



Front narrow, yearl-grey above ; thorax clove-brown, with 

 a jjair of pearl-i/rey stripes scarcely extending beyond trans- 

 verse suture, and a narrow transverse band of silvery pile on 

 hind border / abdomen seal-brown, third and fourth segments 

 each V)ith a greyish-white median spot, bluntly triangular or 

 semioval in outline, and clothed with shining, appressed cream- 

 coloured hair. 



Head clove-brown, front, face, jowls, and occiput grey 

 pollinose, face and jowls clothed with white hair; frontal 

 callus and subcallus (? denuded) dark brown, the former 

 elongate quadrate, extending from eye to eye ; jyalpi dark 

 brown, slender, clothed with whitish hair ; first and second 

 joints of antennae slate-grey, clothed above with minute 

 black hairs, first joint also with whitish hairs below, third 

 joint narrow, elongate, clove-brown, slightly ferruginous at 

 extreme base. Thorax : grey dorsal stripes conspicuous 

 when viewed from behind, the interspace also greyisli, 

 divided by a narrow median light brown stripe, each grey 

 stripe with a light brown outer edging; ground-colour of 

 transverse posterior band (including greater portion of post- 

 alar ealli) pearl-grey ; pectus and pleurie greyish pollinose, 

 clothed with whitish hair; scutellum bluisli-grey pollinose, 

 upper i)ortion of hind margin brownish. Abdomen : median 

 spots with their bases resting on hind margins of segments, 

 spot on third segment not reaching to front margin ; sides 

 of first segment, and posterior angles of second, third, and 

 fourth segments grey, clothed with whitish hair ; hind 

 Ann. <& Mag. N. Hist. «er. 8. Vol. i. 1.^ 



