DISTRIBUTION" OF GLOSSINA PALPALIS. 27 



humeral callus on each side small, ovoid, or nearly circular, and 

 especially conspicuous when the insect is viewed from above and 

 slightly from behind ; femora pale, the dark area much reduced. 



The types of this variety — which are from the Katumbela 

 River, Angola, and were collected in November, 1904, by Dr. F. 

 Creighton Wellman, in whose honour the form was named — are 

 in the British Museum (Natural History). Writing from 

 Benguella on February 5th, 1905, Dr. Wellman said: — "I took 

 about eighty specimens of these Tsetse-flies in four days along 

 the banks of the Katumbela River, two days from the coast, in 

 the height of the rainy season." 



Besides occurring in Angola the variety welhnani is appa- 

 rently also found in other localities, as in the Gambia, the 

 Katanga District of the Congo Free State, in the Matondwi 

 Islands in Lake Tanganyika, and elsewhere. It may be added 

 that the National Collection contains a considerable number of 

 specimens from various localities, including the Gambia, Gold 

 Coast, and Northern and Southern Nigeria, which would appear 

 to be intermediate between typical Glossina palpalis, Rob.-Desv., 

 and G. palpalis var. welhuani, Austen. 



Distribution op G. palpalis, Rob.-Desv. 



The area occupied by Glossina palpalis, as at present known, 

 includes the whole of West Africa, from the mouth of the 

 Senegal River (about 16° N.) to Angola (where the variety 

 wellmani apparently predominates), and extends eastward into 

 the southern Bahr-el-Ghazal. Proceeding southward, the eastern 

 boundary of the species follows the valley of the Nile, and 

 includes the eastern shores of Lakes Victoria (in the East Africa 

 Protectorate and German East Africa) and Tanganyika (in 

 German East Africa), and their affluents ; from the southern 

 end of the latter lake the boundary trends south-west, approxi- 

 mately following the frontier between North-Eastern Rliodesia 

 and the Congo Free State, and passing through the Katanga 

 district of the latter country into Angola. G. palpalis appears 

 not to occur on Lake Nyasa. 



Bionomics. 



Owing to the limited space available in this volume it has been 

 found altogether impossible to attempt to give a resume of present 

 knowledge of the bionomics of Glossina p)alpalis, concerning 



