UASED ON A STUDY OF THE MALE GENITAL ARMATURE. 17 



and distinctly membranous in fharactei'. Juxta, or penis sheath, membi-anous, 

 but supported by sclevites on both distal and proximal sides. Median process 

 (mp) short and not extending beyond the inferior claspers ; upper edge broader 

 than the support, with a deep median depression. 



The armature of G. fusca may be readily distinguished from those of its 

 allies by the curiously serrated edge of the broad spathnliform portion of the 

 harpes, by the shape of the inferior claspers, and the great width between the 

 superior claspers. 



Glossina nigrofusca, Newstead.*' 



(^ Glussina c/nissa, Newstead (nee Bigot), Ann. Trop. Med. and Parasit., IV, 

 p. 373 (1910). 



Glossina nicirofusca, Newstead, I.e., p. 370. 



This species is distinguishable from Glossina fusca by its generally darker 

 colour, the darker hind tarsi in the male, the narrow lines on the thorax and the 

 strongly pubescent character of the antennae ; also in the male armature, by the 

 form of the superior claspers (fig. 5), the large group of squamiform spines {s) 

 over the harjDes {h), and the broad dark sclerite arising from its anterior 

 ]iortion at the base of the vesica (w). 



Whether the dark coloiu' and the strikingly clear and narrow thoracic markings 

 are constant remains to be seen ; the strongly pubescent antennae, however, with 

 their recurved apices, may be taken as fixed characters. The structural 

 characters of the genital armature are markedly distinct from those of the other 

 members of \he fusca group. 



Length, 11-12 mm. ; length of wing, 11-11.50 mm. 



Thorax very dark brown to blackish bi-own, with very narrow pale longitudinal 

 stripes, scarcely broader than the pale transverse suture. Abdomen blackish 

 Itrown, with the second (largest) segment markedly paler. Legs dusky ; hind 

 tarsi either all dark, or with the last two segments black, the rest also rather 

 dark but gradually paling proximally ; hind and middle femora with a broad 

 infuscated band. 



Male. — Head dusky brown to diisky buff; posterior surface dusky grey, 

 sometimes darker towards the ujjper margins ; facial pit grey to ochreous grey ; 

 frontal margins shimmering creamy white or yellow white. Antennae with the 

 terminal segment strongly recurved, and clothed with long pubescent hairs, the 

 longest hairs on the dorsal edge being equal to about three-fourths the 

 width of the segment. Palpi long and relatively thin, brown with the tips 

 slightly darker. Bulb of proboscis pale, with the proximal portion faintly 

 infuscated. Thorax very dark brown to blackish brown, with very narrow pale 

 longitudinal stripes, the submedian ones being generally sharply and clearly defined 

 and scarcely broader than the pale transverse suture ; pleurae dark brown. 

 Abdomen blackish brown, with the second segment ochreous brown ; there is no 

 median stripe on the remaining segments, but a trace of ochreous brown is faintly 

 visible on the third, fourth and fifth ; lateral margins of all the segments 

 narrowly paler than the rest ; venter dusky ochreous : sides of the third, fourth 

 and fifth segments and also the hypopygium infuscated ; stigmata white. 



* See foot-note on p. 9. 



