Fig. 1. The larva of a flea. The body consists of thirteen 

 segments and is legless. On the fore part of the head 

 are the antennae and on the upper part of the head is 

 shown the knife-like edge of the egg-breaker. The mouth- 

 parts are adapted for biting. On the last segment of 

 the body are the two caudal stylets. 



