SPECIES OP TABANUS. — PART I. 285 



triangukr depression at each end of transverse suture drab-grey and clothed 

 with black hair ; pleurae and pectus light grey (upper portion of mesopleura 

 drab-grey), clothed with greyish white hair. Abdomen : dorsum of first segment 

 grey on basal angles, and with a small patch of pale yellowish hair in middle hue, 

 just beyond scutellum ; distal angles of dorsum of first segment, and sides and 

 distal angles of dorsum of five following segments clothed with pale yellowish 

 hairs, which on second to sixth segments inclusive extend inwards along hind 

 margins ; dorsum of second segment grey at extreme base ; hind margins of 

 second and following segments isabella-coloured or smoke-grey ; dark portion of 

 dorsum clothed for most part with minute black hairs, but on second to sixth 

 segments inclusive also clothed in and adjacent to middle line with minute, 

 appressed, pale yellowish or ochreous hairs, which on the second segment of a 

 specimen from the Anglo-Egyptian Sudan form a pale median triangle, the base 

 of which rests on the hind margin while the apex extends to the grey anterior 

 border ; paired spots (described in diagnosis above) clothed with minute, 

 appressed, pale yellowish hairs, and situate on dorsum of second to fifth (or 

 sixth) segments inclusive, one spot midway between middle line and lateral 

 margin on each side ; on the second to the fourth segments inclusive the spots 

 are not in contact with either the front or the hind margins, but on the fifth 

 segment (and also, when present, on the sixth) they usually touch the front 

 margin ; when elongate, the spots usually have their longer diameters at right 

 angles to the middle line of the abdomen, in which case there is often an 

 indistinct greyish connection between the spots belonging to the same pair ; 

 occasionally the spots on the second segment are slightly oblique (in the case of 

 the specimen from the Anglo-Egyptian Sudan referred to above the spots on the 

 second and third segments are obliquely ovalj ; venter light grey, clothed, 

 except last segment, with whitish hair, hind margins of second and following 

 segments, except last, cream-coloured. Wings hyaline, veins (except costa and 

 lirst longitudinal, which are mummy-brown) pale cinnamon ; stigma elongate, 

 raw-sienna-coloured or paler, inconspicuous. Squamae pale isabella-coloured. 

 Ilultercs : stalks cream-bufF, darker at extremities ; knobs cream-coloured, 

 isabella-coloured above. Legs : front coxae drab-grey, middle and hind coxae 

 grey, all coxae, like all femora and tibiae, clothed with silvery-white hair, which 

 in case of tibiae is mixed with black hairs ; femora and tibiae ochraceous-bufl', 

 femora greyish pollinose, sometimes more or less grey, hind tibiae ciliated on 

 outer side with silvery-white hairs mixed with black hairs ; front tarsi dark 

 brown, not noticeably expanded, first joint (except distal extremity) and extreme 

 bases of the three following joints usually cinnamon-coloured ; middle and hind 

 tarsi pale cinnamon or buff, tips of joints mummy-brown, last joint usually 

 entirely or almost entirely mummy-brown, sometimes dark brown. 



Nyasalaxd Pkotectorate and the Axglo-Egyptian Sudan : type and 

 sixteen other specimens (five of them presented to the National Collection by the 

 Entomological Research Committee) from the Lufira River, North Nyasa, 

 Nyasaland Protectorate, 6. viii. 1909, " on crocodile " {Dr. J. B. Davey) ; one 

 specimen from Dufile, Mongalla Province, Anglo-Egyptian Sudan, 19. vi. 1911, 

 " on cattle " {U. H. King). 



