7i 
impossible to get flies which had been allowed to gorge themselves to 
again feed within from three to five hours’ time, although they would 
do so readily eight hours after a first feed. 
It has already been stated that G. palpalis may buzz loudly 
while flying. When at rest, often just after feeding, it sometimes 
produces a shrill, high-pitched note. A wingless fly was watched with 
a pocket-lens while sounding in this way. The tips of its halteres 
were seen to be depressed downwards and forwards, but the 
mechanism by which the note was produced was not ascertained. 
Glossina palpalis, var. welhnani, Austen 
Localities :— On the Congo River, between Nyangwe and 
Kasongo ; on the Gambia River, near its mouth, at Oyster Creek. 
Circumstances of capture :—So far as was observed the habits of 
these flies were quite similar to those of Glossina palpalis. 
Glossina morsitans, Westwood 
Localities: Specimens have been received, through Monsieur 
Brohez, only from the Katanga district. The exact locality and the 
circumstances under which they were caught are not certain, but they 
were probably taken along the Luvua River near Pueto. Dr. Hosselet 
definitely reports that this fly is everywhere present in the zone of 
Uele, but we have seen no specimens. 
Glossina fusca, Walker 
Larva ( dissected from body of parent but fully matured ).— This 
consists of twelve strongly defined segments; surface finely tesselated, 
the individual tesserae being circular, flat, and shiny. Form, rather 
short ovate. Mouth-hooks relatively large, black, rather widely 
separated, but not porrected. Anal segment or “ black hood ” very 
coarsely rugose, the space between the converged points of the tumid 
lips one-third the diameter of one lip. Colour white, with a trace of 
lemon-yellow ; hood or anal segment black. 
Length 5-50 to 6 mm.; width 3 to 4111m. 
Pupa much more tumid and ovate than that of G. palpalis, 
especially so posteriorly. The tumid lips are also more depressed, 
and being continuous at their bases and only slightly divided 
posteriorly form a deep siphon-like tube or crateriform process, so 
