6 GLOSSINA AND H.EMATOPOTA. 



"degs" in various parts of Great Britain, resembles Ghssina 

 somewhat closely when at rest. The species of this genus, of 

 which no less than twenty-two have been recorded from various 

 parts of Africa, are of much the same size as the larger Tsetse- 

 flies,* and are of the same brownish colour and elongate shape. 

 In no case, however, is the abdomen marked with dark bands on 

 a light ground, while the wings in the resting position do not 

 close one over the other, but diverge slightly at the tips and are 

 also somewhat tediform, i.e. they meet together at the base like 

 the roof of a house (Fig. 4). The antennae, too, afford a further 



Beematojiota sp., from Zululand, in resting attitude, showing the position 

 of the wings. (X 4.) The wing marliings are omitted. 



means of distinction. While the antennae of Tsetse-flies, as of all 

 Muscidse, are drooping, those of Hsematopota project horizontally 

 in front of the head, and being of some length are readily .seen. 



Where Tsetse-flies ^^^^ ^^ ^^^^^ P^^'*^ ^^ Africa in which the 

 Tsetse occurs it is not found everywhere, but 

 is confined to definite tracts which are known 

 as " Fly -belts." We are still somewhat in 

 the dark as to the factors that determine 

 the limits of these " belts," but, although 

 the Tsetse is undoubtedly dependent upon 

 the blood of wild animals for its continued 



* The average length of an African Hsematopota is 5 lines (11 milli- 

 metres) ; average wing-expanse 11 lines (24 millimetres). 



are usually found : 



their fondness for 



river banks and 



the neighbourhood 



of water, and 



avoidance of open 



plains : swarms met 



with in 



certain places. 



