fiBNteST li. AUSTEN — NEW AFRICAN lliPPOBOSCIDj;. 1?1 



markings, the much greater hairiness of the dorsum of the thorax, and the 

 greater coarseness and outstanding character of the hair on the hind femora. 



Larva. — A larva of this species in the British Museum (Natural History), 

 deposited by a Q taken by Dr. Van Someren at Mohokya, Toro, Uganda 

 Protectorate, in February, 1911 (presented by the Entomological Research 

 Committee), is of the usual Hijjpohosca-iry^Q, i.e., ovoid or flattened globular in 

 shape, and cream-buff" in colour, with, at the narrower (posterior) extremity, a 

 very conspicuous black cap, which exhibits two prominences separated by a 

 broad vertical groove. The dimensions of this specimen are : — length 4 mm., 

 greatest breadth, 3'5 mm. 



Hippobosca hirsuta var. neavei, var. u. 



(^ Q. — Length, J' (6 specimens) 6 to 6'5 mm., Q (4 specimens) 6'75 mm. 

 (non-gravid) to 9 mm. (gravid) ; width of head (both sexes) 2 mm. to 2"2 mm. ; 

 width of front (both sexes) just under 1 mm. to 1 mm. ; length of wing, c? 6" 75 

 to 7-6 mm., Q 7*2 to 7-75. 



Apart from being on the whole somewhat smaller in size, as indicated hy the 

 dimensions given above, agreeing in all essential respects except shape of median spot 

 on scutellum, ivith typical form ; median spot on scittellum — instead of being large, 

 rounded in front, and flattened behind — small and shaped as shown in Fig. 1, b, 

 that is, more or less triangular, with apex of triangle resting on hind margin. 



Head: anterior portion of plate on vertex usually brown or brownish. 

 Thorax : scutellum on each side of median spot, except basal angles, generally 

 ochraceous or ochraceous-buff" rather than dark brown. 



Noeth-Eastern Rhodesia (Luangwa River Valley) : type of c^, type 

 of Q , and two other cj" (^ from the junction of the Mpamadzi and Luangwa 

 Rivers, 24. VIII. 1910 ; two c^ (S , two QQ from the Upper Luangwa River, 

 3. VIII. 1910; one c5', one Q from the Mid Luangwa River, 12. VIII. 1910 

 (.S*. A. Neace : presented by the Entomological Research Committee). 



The whole of these sjjecimens were taken on Waterbucks, and there seems no 

 reason to consider them as representing anything more than a variety of the 

 Hippobosca infesting the same animal in Uganda, which is here regarded as the 

 typical form. 



Genus Olfersia, Wied. 

 Olfersia dukei, sp. n. 



Q. — Length (1 specimen) 7 mm, ; width of head 2 mm.; width of front at 

 vertex 1-4 mm. ; length of wing 9'4 mm. 



General coloration black or clove-brown ; sides of front (frontal margins or paru- 

 frontals), plate on vertex, and dorsum of thorax (except humeral calli) shining black 

 or blackish clove-brown ; abdomen, dorsal surfaces of middle and hind legs, and 

 dorsal surface of front femora clove-brown; anterior two-thirds of inner borders of 

 sides affront clothed loith fairly long yelloivish hair, unth as usual a single longer 

 black hair in front and behind ; loings sepia-coloured. 



Head : shining plate on vertex transversely elongate, anterior angles rounded 

 off", length of hind margin at least two and a half times as great as depth of plate 



