69 



CHAPTER VI. 



THE GLOSSINA FUSCA GROUP. 



SYNOPSIS OF SPECIES. 



1. Third joint of antennae fringed with fine 



hair on anterior and posterior margins ; 

 fringe on anterior margin conspicuous 

 under a hand-lens magnifying 15 dia- 

 meters (nominal), when head is viewed 



in profile 2 



Third joint of antennae with fringe of fine 

 hair on anterior margin so short as to be 

 scarcely noticeable under a hand-lens 

 magnifying 15 diameters (nominal), when 

 head is viewed in profile (longest hairs in 

 fringe in length not exceeding one-sixth 

 of width of third joint) ; palpi long and 

 slender 3 



2. Longest hairs in fringe on front margin of 



third joint of antennae, in length equal 

 to from one-fourth to one-third (not 

 exceeding one-third) of width of third 



joint ; palpi of moderate length tabaniformis, Westw. 



Longest hairs in fringe on front margin of 

 third joint of antennae in length equal 

 to from one-half to three-fourths of width 

 of third joint ; palpi noticeably long and 

 slender nigrofusca, Newst. 



3. Pleurae drab-grey or Isabella-coloured, hind 



coxae buff or greyish-buff fiisca, Walk. 



Pleurae dark grey, hind coxae mouse-grey, fuscipleuris, sp. nov. 



Glossina fusca, Walk. 



(Plate VIII.) 



Stomoxys fuscus, Walker, List Dipt. Ins. in Coll. Brit. Mus., Part III, 

 p. 682 (1849). 



Glossina fusca, Walker, "Entomologist," Vol. VI., p. 328 (1873) (ncc 

 Austen, Monograph of the Tsetse-Plies, pp. 95-97, Plate VI (1903)) ; 

 Newstead, Annals of Tropical Medicine and Parasitology, Series T. M., 

 Vol. IV, No. 3, pp. 370, 373 (December 20, 1910). 



(^ , 9. — Length, ^ (12 specimens) 9"G to ITG mm., 9 

 (24 specimens) 10'5 to 11*8 mm. ; width of head, ,^ 3 to 



