174 ENTOMOLOGY FOR MEDICAL OFFICERS 



Glossina caliginea, Austen. 



This species is known at present only from Southern 

 Nigeria. It differs from G. palpalis chiefly in its slightly 

 larger size ; in the abdomen being darker, though the pale 

 area on the 2nd segment is larger ; and in not having the 

 hind margins of any of the abdominal segments definitely 

 pale. 



Glossina pallicera. Bigot. 



This species, which has been found in places from Sierra 

 Leone to French Congo, is said to be rare. It differs from 

 G. palpalis chiefly in having the abdomen muddy brown 

 without any pale definition of the hind margins of the 

 segments, and in having the 3rd segment of the antennae 

 " cream buff to ochraceous buff," and fringed with long, fine, 

 pale yellowish hair. 



Glossina tachinoides, Westwood. 



This is a small species, the length, according to Austen, 

 being from 6-8 to 8-4 mm. in the female and from 6 to 6-75 

 mm. in the male. It has been found in West Africa, from 

 Senegal to French Congo, in the French Sudan, in German 

 East Africa, and in Southern Arabia, being the only species 

 known to exist outside the African continent. It is easily 

 recognised among the .species having all the tarsi of the hind 

 legs dark, by its small size, and by the very distinctly banded 

 abdomen. The ground colour of the abdomen is buff, on the 

 dorsum of the 2nd segment there are two lateral dark spots, 

 and on the dorsum of segments 3 to 6 there are dark cross- 

 bands which are broadly interrupted in the middle line, and 

 fall considerably short of the lateral and hind margins of the 

 segments. 



Glossina morsitans, Westwood. 



According to Austen, this, the original and notorious 

 " tsetse-fly," is the most widely distributed of all the species 

 of Glossina, its northern range being bounded on the west by 

 Senegambia and on the east by Abyssinia, and its southern 

 range extending into Zululand. Within these limits the fly 

 is usually restricted to definite, more or less shady " belts," 



