GLOSSINA, STOMOXYS, AND HAEMATOPOTA. 



can liardly take place. Tlie members of both genera are greedy 

 blood-suckers, and often torment liuman beings and domestic 

 animals very greatly. Although 

 Sfomoxifs also has a prominent pro- 

 boscis, it is not ensheathed in tlic 

 palpi, and is consequently nuich 

 more slender in appearance than the 

 proboscis of Glossina. The species 

 of the former genus are usually 

 greyish, greyish-black, or blackish 

 flies, and since their wings when in 

 the resting position, instead of closing 

 one over the other, diverge at an 

 angle (see Fig. 2), like those of Mnsca 

 flomestica, it is easy to distinguish 

 them from Tsetse-flies. Haematopota, 

 on the other hand, a genus of small 

 horse-flies (Family Tabanidae) abun- 

 dantly represented in Tropical Africa, 

 resembles Glossina somewhat closely when at rest. Although 

 the species of this geiuxs are of much the same elongate shape 



Fig. 2. 



Stoi)w.v}i>i calcitrant:, L., in resting 

 attitude, showing the position of 

 tlie wings. (Partly diagrammatic. 

 X 4.) 



l-'ig. 3. 



Haematopota vittata, Lw. (Tropical Africa), in resting attitude, showing the position 



of the wings. (Partly diagrammatic, x 4.) The wing markings arc omitted. 



as Tsetse-flies, their wings in the resting position do not close 

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



