FLIES. 357 



from between the segments of the caterpillar and 

 pupate in the case beside the remains of their 

 victim. We opened the case of our caterpillar, and 

 counted 143 cocoons left by the flies. They were 

 a reddish brown, consisting of the seed-like pu- 

 parium or last larval skin. 



These flies have large squamge which completely 

 cover the halteres, and the cell of tlie wing, marked 

 "Cell a," is either completely closed or almost 

 closed (Plate 44, Fig. 6.) Sharp records 

 that a certain species of tachinid fly para- 

 sitises the silkworms, the egg being laid on 

 the mulberry leaves, and is then taken into 

 the body of the silkworm with its food. Others 

 are said to lay eggs on the food supply of Bembex: 

 Avasps. i 



