fiASED ON A STUDY OF THE MALE GENITAL ARMATURE. 



23 



juxta. Vesica {v) minute and rudimentary. Jiixta or penis sheath (j), relatively 

 narrow, the upper surface represented by two strips of chitin, which ciu-ve 

 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 Glossiiia palpaUs, 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. fachinoides. 



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 intcrgrade 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 doi-so-ventrall}- ; inner lateral bristles long but shortening 



