68 THYSANURA. 



similar but transient larval stages of many other insects, 

 such as the larvae of Orthoptera, of many of the Cara- 

 bidse and Hemiptera, etc. It will be seen that, as a 

 member of the same order as Campodea, it never 

 develops beyond a generalized stage, which is repre- 

 sented only in the larvse of more specialized insects. 

 It will also be seen that in the more generalized 

 orders of insects, like Orthoptera, Platyptera, Hemip- 

 tera, Neuroptera, and in the more generalized forms 

 of some orders, like the Coleoptera gentima as com- 

 pared with the Weevils, it is oftener represented in 

 the larvae than among the more specialized orders or 

 forms, like the Lepidoptera, Hymenoptera, and Dip- 

 tera. In these the development has departed very 

 widely from the ancestral type, the larvae having secon- 

 dary forms, such as caterpillars, grubs, and maggots, in 

 the youngest stages. 



