BASED ON A STUDY OF THE MALE GENITAL ARMATURE. 23 
juxta. Vesica (v) minute and rudimentary. Juxta or penis sheath (/), relatively 
narrow, the upper surface represented by two strips of chitin, which curve 
outwards distally, their apices being distinctly lobe-like ; basally these strips 
meet and form a single tube. On either side of the juxta is a short tubular 
process, and attached to the lower or distal opening of this is a folded membrane 
which is thickly studded with minute spines. 
Fig. 9. Male armature of Glossina palpalis, R. D.; ventral view. 
The most marked character of the armature of this tsetse-fly is the curious 
form of the inferior claspers, and this is the only structure in which it differs 
specifically from the armature of the male of G. tachinoides. 
Glossina palpalis var. wellmani. Austen. 
A large series of preparations of this variety has been examined micro- 
scopically, with the result that the genital armature has been found to be quite 
identical with that in typical examples of G. palpalis. This form is distinguished 
from normal G. palpalis by its smaller size and slightly different thoracic 
markings. These differences, however, are not sub-specific, but merely varietal in 
character, for the var. wellmani occurs in company with the typical form in 
various localities, and in a good series every intergrade can be found, 
Glossina caliginea, Austen. 
Genital armature of the male (fig. 10).—Superior claspers (sc) curving inwards 
and calliper-like ; tooth at distal extremity very long and falciform, the length 
nearly equal to one-third the length of the clasper, strongly curved ventrally as 
well as laterally, so much so that its actual length is difficult to determine when 
viewed dorso-ventrally as shown in the illustration ; remaining portion of clasper 
very broad and flattened dorso-ventrally ; inner lateral bristles long but shortening 
