123 



" The appearance presented by a pupa-case from which a Mutillid 

 parasite has emerged," says Dr. Lamborn, " seems to me characteristic 

 and unmistakable, though a contrary opinion has recently been 

 expressed (Eminson, quoted in Bull. Ent. Res., v, p. 382. Vide supra, 

 p. 121). On taking such a case in the fingers there is, owing to the 

 presence of the Mutilla cocoon within, a sense of greater solidity than 



Fig. 12. Stomatocerasmicans, Wtst., (j>, a small Hymsnopteron of the Family 

 Chalcididae, parasitic in the larval stage in pupae of Glosswa morsitans in 

 Northern Rhodesia and Nyasaland. (After Waterston, 160.) 



when a fly has emerged, and it is possible by gentle pressure to crumble 

 away the wall of the puparium so as to obtain the cocoon, a light 

 chestnut-coloured structure composed of several layers of a very tough 

 silky-looking material. The orifice of exit is usually much smaller and 

 has a serrate edge, instead of the larger clean-cut fracture produced by 

 the emergence of the fly, owing to the parasite having nibbled out a 



