86 COLEOPTERA. 



lateral respiratory filaments on each segment. They 

 became fully grown in August, crawl out of the water 

 and spin an oval cocoon, within which the pupa re- 

 mains a month, and then appears as a beetle." ((, 

 436; 14, I., 105). 



Hydrovhuad/e. 



Aquatic beetles of an ovate or liemispherical and 

 convex form. Legs of moderate length, middle and 

 posterior pairs sometimes fitted for swimming. The 

 adult insects feed upon decaying vegetable matter. 



The eggs are placed in a silken nidus spun by the 

 female. Larv;e carnivorous. (1,437; '4- ^■> 122). 



SlLPHID/E {Carton, or Sexton Bci'tles.) 



These beetles may be recognized by the depressed 



A/*^ ' form of their heads and bodies, by their clavate anten- 



\ na;, and by a disgusting odor. They are found in the 



vicinity of carion, upon which they and their larvae 



feed. (14, I., 135). 



Note habits of the Burying-Bcetles, Necrophorns. 



Staph YiJNin.4i {Rovc-Bcctlcs). 



'-K 



Beetles with long bodies, and very short elytra, un- 

 der which the long wings are folded when not in use. 

 They are mostly minute. They feed upon decaying 

 animal and vegetable matter, and are common under 

 sticks, stones, and in the neighborhood of carion. The 

 adult insects have a habit, when frightened, of raising 



