PUPA OF ZULULAND TSETSE. 



27 



produced on each side into a prominent tumid lip. These hps 

 enclose a deep pit, within which in the larval state were situated 

 the posterior stigmata or respiratory apertures (Fig. 7a). 



Pupa of Zululand Tsetse-fly, dorsal aspect (X 12); or, posterior extremity, 

 showing pit and right larval stigma, st (x 24) ; b, anterior extremity, 

 showing bifurcated longitudinal seam, which opens to permit the 

 escape of the imago (X 8). 



The pupa consists of twelve segments, divided by fine grooved 

 rings as if traced with the point of a needle. The first eleven 

 segments are smooth, but when examined under a low power 

 are seen to have a shagreen-like or tessellated surface. At 

 the anterior pole the seam which opens to permit the escape 

 of the fly is visible as a semicircular groove, running across 

 the first three segments in a lateral longitudinal direction, 

 and terminating on each side in a bifurcation on the fourth 

 segment (Fig. 7b). In the centre of the first segment (which is 

 much smaller than any of the others), at the anterior pole, a 



