18 



the posterior margin of the hind coxae below being distinctly longer 

 and finer." 



At the time of its description, in 1911, the only known specimen of 

 this species was a solitary <$, taken in the Ituri Forest, north-eastern 

 Belgian Congo. From subsequent investigations, however, it would 

 appear that, although by no means common, the species is very widely 

 distributed, and besides being found in Belgian Congo it is now known 

 also to occur in Uganda and Kenya Colony. In Uganda it was taken 

 on the north-east side of Lake Albert, in 1906 (Dr. A. Hodges), 

 and subsequently in the following localities : Durini River, Toro, 

 6.iii.l911, "in forest " (Dr. R. van Someren) ; Daro or Durro Forest 

 Toro, alt. 4,000-4,500 ft., 25-29 x.1911 (Dr. S. A. Neave) ; Buamba 

 Forest, Semliki Valley, alt. 2,300-2,800 ft. (Dr. S. A. Neave). 

 G. fuscipleuris also occurs in Upper Lukuga, Belgian Congo, between 

 the River Lualaba and Lake Tanganyika (55). In Kenya Colony, 

 the species was met with " in some numbers " on the Amala River, 

 Southern Masai Reserve, alt. 5,000 ft., 27.vii. and 2.viii,1913, by the 

 late Captain R. B. Woosnam. It is possible that Newham's record 

 (104) of the occurrence of Glossina fusca in south-east Tanganyika 

 Territory really refers to the present species. 



Glossina nigrofusca, Newst. Of this Tsetse Austen writes : 

 " Resembling Glossina fusca, Walk., especially in the $ sex, but 

 distinguishable inter alia by the third joint of the antennae being 

 clothed with long and fine pale hair, forming a conspicuous fringe down 

 the anterior and posterior edges, the length of the fringe on the anterior 

 edge being equal to from one-half to three-fourths of the width of the 

 third joint/' 



As regards its distribution, the same authority remarks : " The 

 few specimens of this species received or recorded up to the present 

 time [1911] show that the range of G. nigrofusca extends at any rate 

 from Ashanti (where, according to Dr. Graham, it appears to be of 

 local rather than general occurrence) to the Congo Free State " (Belgian 

 Congo Kasongo). The species has since been stated to occur in the 

 Ivory Coast (Bouet and Roubaud. 13). 



Glossina tabaniformis, Westw. " Large, dark brown, dusky- 

 winged species, closely resembling G. nigrofusca, Newst., in general 

 appearance, but distinguished by the palpi (and proboscis) being much 

 shorter, and by the length of the fringe of fine hair on the anterior edge 

 of the third joint of the antennae not exceeding one- third (instead of 

 being equal to from one-half to three-fourths) of the width of the third 

 joint " (Austen). 



The area of distribution of this species, as at present known, includes 

 the Ivory and Gold Coasts, Southern Nigeria, Cameroon (H. Closer), 

 and French and Belgian Congo. In French Congo, G. tabaniformis 

 was met with by Dr. Roubaud in Sangha, Ogove, Lefini and Alima ; 

 in Belgian Congo a $ was taken at Leopoldville in 1903, and subse- 

 quently two or three other specimens were met with by Dr. Schwetz 

 (132) in north Katanga (see below, p. 56). In October, 1920, Schwetz 

 encountered the species in large numbers in south-western Belgian 

 Congo, in the Kikwit Forest on the Kwilu River. 



GROUP IV. 



The special characters of this, the Glossina brevipalpis Group are 

 given by Austen as : " Wings pale (pale Isabella-coloured, or light 

 drab), palpi short." 



