IX 



Larva and Pupa. — ^According to Bruce, tsetse 

 flies (or at least one species) do not lay eggs, but 

 extrude a yellow-coloured larva. After a few 

 hours this changes into a pupa. The pupa is 

 six mm. long and three mm. broad. It consists 

 of twelve segments. The twelfth segment is pro- 

 duced into two large lips, enclosing a pit, the site 

 of the respiratory stigmata in the larva. At the 

 anterior end is a longitudinal groove, through 

 which the fly eventually emerges. 



Fig. 96. Wing Venation of Glossina, and antenna with 

 Feathered Arista. {After Austen) 



Classification of Species 



(i) Hind tarsi entirely dark. 



(a) Abdominal segments : sharply defined pale 

 hind borders. Second segment : a conspicuous 

 square or oblong pale area in the centre. 



1. Gl. tachinoides. — The smallest tsetse fly 

 (8 mm,). $ smaller. In the ? the tarsi basally 

 somewhat pale. 



(6) Abdominal segments : hind borders, if 

 lighter, extremely narrow. Second segment : pale 

 area triangular. Larger species than (a). 



2. Gl. palpalis. — Darkest of all species of 

 Glossina. Third joint of antenna dusky-brown 

 to cinereous black. 



