vi] LARVAE AND THEIR ADAPTATIONS 75 



unlike most of their allies, live exposed on the foliage 

 of plants, where they feed by preying on aphids. 



Fig. 22. Ox Warble-fly (Hypoderma bovis), a, female ; b, full-grown 

 maggot from back of ox, dorsal view ; c, egg; rf, empty puparium, 

 ventral view ; e, young maggot from gullet, ventral view. Mag- 

 nified (lines show natural size), a- d, after Theobald, 2nd 

 Ecport Econ. Zool. (Brit. Mus.). 



