125 



the course of the chase it ran repeatedly very near to the female, but 

 being off the fresh track did not detect it, the sense of sight being 

 evidently of very little help to it in the matter. 



" Various pairs have been kept in captivity in jars containing a 

 number of tsetse pupae buried in earth, in the hope that the females 

 would sooner or later parasitise them. This expectation seems likely 

 to be fulfilled, as on 30th May the first female, which emerged so long 

 ago as the 3rd of that month, was actually witnessed ovipositing in one 

 of the pupae .... At 5.45 p.m., on coming into camp from a 

 day's trek, I removed from inside a box, which had been closed all 

 day, a jar containing the Mutilla female, No. 1, and a number of 

 tsetse pupae, mostly buried in earth, though one or two were on the 

 surface. On the top of one of the latter the Mutilla was seen. It 

 remained still a few seconds, then precipitately vanished beneath a 

 lump of earth, as is their habit when alarmed. In a few minutes it 

 came out into the open again cautiously, and after examining with its 



Fig. 14. Syntomosphyrum glossinae, Wtst., Q, a minute Hymenopteron of the 

 Family Eulophidae, a hypefparasite of the larva of Mutilla glossinae, therefore 

 harmful. (After Waterston, 159.) 



antennae some pupae near the one on which I had first seen it, started, 

 with its head facing the tail end of the pupa, to whittle away with its 

 jaws at a point midway between the two poles with such energy as to 

 rock it. Its antennae were crossed and below its head. After five 

 minutes' work in the horizontal position it gradually raised itself 

 vertically, with its head down on the pupa, supporting itself against 

 the side of the jar, so that a full view of its movements with a lens 

 could readily be obtained. Extremely fine movements of the jaws in 

 and out took place with great rapidity, and with such delicacy that 

 unless one's attention had been attracted by corresponding movements 



