2 DISTINCTIVE CHAEACTEES OF TSETSE-FLIES. 



It is probable that only those who have suftered from the 

 attacks of Tsetse-flies can recognise them when on the wing, but 

 in the resting position their identification is easy. In this attitude 

 they can be distinguished from all other blood-sucking Diptera, 

 with which confusion could possibly take place (especially from 

 those belonging to the genera Stomoxys, Fig. 2, and Haemafopota, 

 Fig. 3, which are most likely to be mistaken for them), by the 

 fact that the wings lie closed fl(d ovrr i>ne another down the hacJi, 



Via. 1. 



A Tsetse-fly, Glossina longipeiinu, Corti (Sonialiland), in i-esting attitude, 

 showing tlie position of tlie wings. (Partly diagrammatic, x 4.) 



like the blades of a pair of scissors, while the proboscis (i.e. the 

 proboscis ensheathed in the palpi) projects horizontalhf in front of 

 the head (see Fig. 1). 



Apart from the prominent proboscis and the mode of carrying 

 the wings when at rest, there is nothing in any way remarkable 

 or striking about the appearance of a Tsetse, and the descriptions 

 of most African travellers emphasise this fact. As already 

 mentioned, species of Stomoxys and Haematopota are most likely 

 to be mistaken for Glossina, and apart from these confusion 



