The Proctotrypoid Parasites 



insects with which it is thus associated from the fact that the 

 trochanters are not divided; that is to say, they appear to be 

 formed of but one segment. They are very curious creatures 

 with an extremely long and slender abdomen, and look like 

 Ichneumon flies. This elongation of the abdomen occurs only 

 in the female sex. The male has a more normal abdomen. In 

 their early stages they are probably parasitic upon the larvae of 

 beetles. Pelecinus polyturator is our commonest species, and 

 Professor Forbes states that he has bred it from May beetle larvae. 



S3 



