BASED ON A STUDY OF THE MALE GENITAL ARMATURE. 17 
and distinctly membranous in character. Juxta, or penis sheath, membranous, 
but supported by selerites 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 spathuliform portion of the 
harpes, by the shape of the inferior claspers, and the great width between the 
superior claspers. 
Glossina nigrofusca, Newstead.* 
3 Glossina grossa, Newstead (nec Bigot), Ann, Trop. Med. and Parasit., LV, 
py s¢ di 1910), 
Glossina nigrofusca, Newstead, l.c., 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 harpes (2), and the broad dark sclerite arising from its anterior 
portion at the base of the vesica (v). 
Whether the dark colour 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 the fusca group. 
Length, 11-12 mm.; length of wing, 11-11.50 mm. 
Thorax very dark brown to blackish brown, with very narrow pale longitudinal 
stripes, scarcely broader than the pale transverse suture. Abdomen blackish 
brown, 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 
infuseated band. 
Ma.r.—Head dusky brown to dusky buff; posterior surface dusky grey, 
sometimes darker towards the upper 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 
infuseated. Thorax very dark brown to blackish brown, with very narrow pale 
longitudinal stripes, the suabmedian 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. 
19127 B 
