216 AN INTRODUCTION TO ENTOMOLOGY 



BB. Either without a distinct head, or without jointed legs, or incapable of 

 locomotion. 

 C. Forms that are legless but capable of locomotion; in some the head is 

 distinct, in others not. Here belong many larvae representing several of 

 the orders, and the active pupse of mosquitoes and certain midges. It is 

 impracticable to separate them in this key. 

 CC. Sedentary forms, incapable of locomotion. 



D. Small abnormal insects in which the body is either scale-like or gall- 

 like in form, or grub-like clothed with wax. The waxy covering may be 

 in the form of powder, or large tufts or plates, or a continuous layer, or of 

 a thin scale, beneath which the insect lives. (Coccidse). p. 350.HEMIPTERA 

 DD. Pupae, the inactive stage of insects with a complete metamor- 

 phosis; capable only of a wriggling motion, and incapable of 

 feeding. 

 E. Obtected pupae, pupae in which the legs and wings are glued to the 

 surface of the body; either in a cocoon or naked, p. 571 . Lepidoptera 

 EE. Coarctate pupae, pupae enclosed in the hardened larval skin. 



p. 773 DiPTERA 



EEE. Exarate pupae, pupas that have the legs and wings free; either in 

 a cocoon or naked. This type of pupa is characteristic of all of the 

 orders in which the metamorphosis is complete except the Lepidop- 

 tera and Diptera. 



The order Protura does not occur in the foregoing table because 

 it has only now, in this edition (1936), been placed among the 

 Hexapoda. Since the members of the order are uncommon insects 

 rarely met with it did not seem advisable to incur the added expense 

 of rearranging and reprinting a large part of the table. 



