, r )4 HYMENOPTERA. 



of that, which would at the same time be death to 

 themselves, they leave the vital parts and princi- 

 pal viscera untouched, feeding only on that fatty 

 substance with which the body of the caterpillar 

 is plentifully provided. This substance furnishes 

 nourishment enough for the larvae to exist till 

 they have attained their full size ; and when they 

 are ready for their usual transformation they 

 pierce the skin of the caterpillar with their teeth, 

 and creeping out in various places spin them- 

 selves a silken covering, in which they pass the 

 chrysalis state. In the mean time the languid 

 and shrivelled caterpillar, with its body like a 

 sieve, after having yielded all its substance to 

 its parasitical companions, is in a short time 

 relieved from its sufferings by death. 



The insects of this genus are for the most 

 part remarkable for the continued vibration of 

 ,their antennae, 



SPECIFICATION. 



Ichneumon manifestator. Ich. corpore atro im- 

 maculate), abdomine sessili cylindrico, pedibus 

 rufis. Linn. Syst. Nat. 1. p. 934. Gmel. p. 2691. 



