African PMthoUimic Diptern. 427 



mimite silvery hairs, second joint dull cinnamon-rufous, 

 third joint fairly hroad, reddish brown, ferruginous at base, 

 last four aiinuli clove-brown. Thorax: dorsum greyish in 

 front between grey longitudinal stripes, which, as well as 

 lateral margins, are clothed with minute, appressed, pale 

 chrome-yellow hairs, remaindei- of dorsum clothed with dark 

 brown hair; a light brown median stripe indistinctly visible 

 in front between grey stripes ; i)riealar calli fawn-coloured 

 (as in T. ivellmanii and T. sharpei, Austen), fringed, behind 

 with long dark brown hair ; pectus and. pleurae greyish 

 pollinose, clothed with whitish hair. Abdomen: sides of first 

 segment greyish pollinose ; median spots with their bases 

 resting on hind margins of segments, spot on third segment 

 not reaching to front margin ; venter, except last two 

 segments, greyish pollinose, clothed with minute, appressed, 

 silvery hairs, hind margins of third and three following 

 segments ci-eam-coloured. IVhiys with a decided brownish 

 tinge ; stigma tolerably well-defined, brown ; squamce 

 brownisli. Halteres cream-buif, knobs seal-brown above and 

 below. Let/s : femora dark greyish brown ; tibise except 

 tips cream-butt"; front tarsi and tips of front tibiae clove- 

 brown, second, third, and fourth joints of front tarsi strongly 

 expanded ; middle and hind tarsi and tips of middle and 

 hind tibioc seal-brown; femora audtibicC (except tips) clothed 

 with whitish hair. 



Northern Nigeria : a single specimen from Jemaa, Nassa- 

 rawa Province, N. Nigeria, 25. iv. 1907 [Dr. R. F. Williams), 

 " on horse." 1 have much pleasure in naming this new 

 species in honour of its discoverer, wiio bus most kindly 

 presented tiie type, together with a number of other blood- 

 sucking Diptera collected by him in Nassarawa Province, to 

 the National Collection. 



Tubanus ivillianisii is closely allied to T. ivfllnianii, Austen 

 (Ann. & Mag. Nat. Hist. ser. 8, vol. i., March 1908, p. 225), 

 which is found in Angola, and with which it agrees in size, 

 coloration, markings, and general appearance; it is distin- 

 guished from 2\ ivellmanii by the shape and coloration of the 

 palpi and basal portion of the third joint of the antenniv, 

 the terminal joint of the palpi being less slender and fawn- 

 coloured instead of dark brown or blackish slate-coloured, 

 while the l)asal portion of the third joint of the antennae is 

 noticeably broader ami reddish brown instead of clove-brown, 

 as well as brighter lVrrugiiu)us at the base ; the front, too, is 

 a shade narrower. T. irillianisii is also near akin to 2\ uryen- 

 U'lis, 8ureouf (Bull. i\lus. Nat. d'llist. Nat. Paris, 1907, no. -A, 

 p. 201), from the (Jaboon, but (from a comparison with the 



