162 



HINTS ON THE ANCESTRY OF INSECTS. 



advanced stage in E), and the bilobate tail (s). Figure 194 (w, 

 mouth; at, rudimentary antennae; md, mandibles; d, tongue-like 

 appendages ; st, anal stylets ; the subject of this flgure is of a 

 different species from the insect previously figured, which, how-: 

 ever, it closely resembles) shows the first larva stage after 

 leaving the egg. This strange form, the author remarks, would 

 scarcely be thought an insect, were not its origin and farther 

 development known, but rather a parasitic Copepodous crusta 

 cean, whence he calls this the Cyclops-like stage. In this cou 



nt at md 

 193. Development of Platygaster. 



dition it clings to the inside of its host by means of its hook-like 

 jaws (md), moving about like a Cestodes embryo with its well 

 known six hooks. The tail moves up and down, and is of but 

 little assistance in its efforts to change its place. Singularly 

 enough, the nervous, vascular, and respiratory systems (tra 

 cheae) are wanting, and the alimentary canal is a blind sac, 

 remaining in an indifferent, or unorganized state. How long 

 it remains in this state could not be ascertained. 



