10 



and Dr. Roubaud, who collected small and very light-coloured specimens 

 at Bani, states that the same forms may be met with to the west of 

 the Niger between Bumba and Kirtashi (13-14 N. Lat.). The form 

 of G. palpalis found in the valley of the Lower Casamance is inter- 

 mediate between the two extreme types. Roubaud mentions that 

 G. fuscipes which, as we have already stated, is now recognised as 

 the eastern form of G. palpalis is represented in the Museum National 

 D'Histoire Naturelle in Paris by a large number of specimens, collected 

 by Cronier on the volcanoes of the Kivu, in Belgian Cone:o, at an altitude 

 of 5,000 to 5,500 ft. 



Dr. Roubaud considers that great importance attaches to the question 

 of geographical races of Tsetse-flies in connection with the transmission 

 of trypanosomiases. 



Glossina caliginea, Austen. The distinctive characters of this 

 species, which in general appearance is very like G. palpalis, are 

 summed up by its author as follows. " Allied to and resembling 

 Glossina palpalis, Rob.-Desv., but browner, and usually somewhat 

 larger ; head distinctly broader, front if anything slightly narrower, 

 at least in < ; dark portion of dorsal surface of abdomen browner 

 (dark sepia-brown, instead of clove-brown or blackish-brown), paler 

 area on second segment, instead of being confined to a usually narrow, 

 median triangle, broad and more or less quadrate or irregular in 

 outline, its lateral margins being generally ill-defined ; hypopygium 

 of < buff or ochraceous-buff, instead of grey as in typical G. palpalis ; 

 pollinose dorsum of seventh abdominal segment in both sexes often 

 cream-buff, and consequently yellower than in G. palpalis ; extreme 

 hind margins of preceding segments (except posterior angles) never 

 lighter. " 



Up to the present G. caliginea, which is very rare, has been met with 

 only in Southern Nigeria, Gold Coast (two or three specimens) and 

 Cameroon (H. Gldser). 



Glossina pallicera, Bigot. The following diagnosis is given by 

 Austen : " Ground colour of dorsum .of thorax olivaceous or olive- 

 grey, with well-developed, dark sepia-brown, longitudinal markings 

 of usual type ; dorsum of abdomen mummy-brown or dark sepia- 

 brown, first segment and a narrow, median, cuneate area on second 

 (not always extending to hind margin) buff ; in $, portion of second 

 segment immediately adjacent to and on each side of cuneate area, and 

 a corresponding region on third and fourth, or third, fourth and fifth 

 segments, sometimes with exception of hind border in each case, 

 usually cinnamon-coloured, therefore paler than lateral portions of 

 these segments ; third joint of antennae pale (cream-buff to ochraceous 

 buff), clothed with long and fine, pale yellowish hair, forming a con- 

 spicuous fringe on front and hind margins ; hind tarsi dark brown 

 above, last two joints clove-brown." 



G. pallicera, which exhibits " an exceedingly close resemblance in 

 general appearance to an unusually light-coloured G. caliginea," is 

 " apparently one of the rarest of the Tsetse-flies at present known " 

 (Austen). The " area of distribution " of this West African species 

 " extends, at any rate, from the Sierra Leone Protectorate to French 

 Congo " (Austen). Professor Laveran has stated that in the latter 

 country a specimen of G. pallicera was taken in January or February, 

 1907, on the Benue River (Mayo-Kabbi region), by Dr. Ducasse. 

 " In Ashanti, according to Dr. Graham, the species appears to be 

 'extremely local ' ' (Austen). G. pallicera has also been recorded 

 from Cameroon (H. Gldser ; Newstead and Evans, 109a), Liberia, 



