COLEOPTERA. 



77 



diversities of form. The forms of coleopterous antennae 

 and tarsi are various, and constitute type forms for nam- 

 ing antennae and tarsi of other insects. (Fig. 32.) 



With the exception of the blister beetles, all the 

 Coleoptera have complete metamorphosis. They lay eggs, 

 which hatch into larvae or grubs; these increase in size 

 and moult several times, then pupate; and, after a time, 



* *r 



FIG. 33. Metamorphosis of a beetle.; Cyllene pictus. A, larva; B, pupa; 

 C, imago. X 3. (Folsom.) 



emerge from the pupal case, adult beetles. (Fig. 33 .) The 

 blister beetles, where their life history is known, also lay 

 eggs; but the larval stage is much extended, and after 

 the different moultings the insect assumes different larval 

 forms suggestive of other beetles in their larval stages. 

 (Fig. 34.) The first larval form is peculiar to the blister 

 beetles, and is given the name of the triungulin larva; the 

 second larval form is much like the larva of a ground 

 beetle ; the third moult reveals a new larva somewhat like 



