168 ENTOMOLOGY FOR MEDICAL OFFICERS 



(a) Synopsis of the Species of the Glossina palpalis Group. 



1. Upper surface of abdomen buff, with very distinct sharply 



defined dark brown cross-bands, broadly interrupted in 

 the middle line, on the 3rd and following segments ; on 

 the 2nd segment the cross-bands are reduced to a large 

 dark spot on either side. In the tarsus of the hind legs 

 the extreme tips of the first 3 segments and the ex- 

 treme bases of the 2nd and 3rd segments may be pale. 

 Size small, the female being less — commonly very much 

 less — than 8-5 mm., and the male being still smaller 



G. tachinoides. 



2. Upper surface of abdomen dark brown, usually with a 



distinct appearance olfine cross-banding due to the fact 

 that the extreme hind margins of the 2nd to the 6th 

 segments are pale ; a small pale triangular area on the 

 2nd segment continuous with a fine pale median line on 

 the other segments. All the tarsal segments of the 

 hind legs entirely dark brown above. Third antennal 

 segment dark, not fringed with long hair. Female 

 always more — commonly very much more — than 8-5 

 mm. G. palpalis. 



3. Upper surface of abdomen dark brown, without any 



appearance of cross-banding. All the tarsal segments 

 of the hind legs entirely dark brown above. In size 

 approaching G. palpalis = 3. 



("Third antennal segment pale, clothed with long fine 

 hair which forms a wide fringe to its anterior and 

 posterior margins G. pallicera. 



I Third antennal segment not pale and not fringed with 

 long hair G. caliginea. 



In the males of the G. palpalis group, as Newstead has 

 shown, the large claspers are more or less claw-like in form 

 and are connected by a membranous curtain. 



(b) Synopsis of the Species of the Glossina morsitans Group : 

 after Austen. 



Last 2 segments of tarsus of front and middle legs with 

 sharply defined clove-brown or black tips = 2. 



