276 



ZOOLOGY 



Order Coleoptera 



Beetles The beetles, usually easily recognized by the hardened 



anterior wings, called elytra (singular elytron), which in 



a/ ~b c 



From Bulletin 67, U. S. National Museum 



FIG. 04. A " ladybird " beetle (Me gilla) : a, larva; b, pupa; c, adult beetle (enlarged). 

 The figure at the right of the illustration is a rove beetle (Philonthus), enlarged. 



the majority of species cover the abdomen and conceal 

 the membranous posterior wings. The posterior wings 

 are folded when at rest. The mouth is mandibulate ; 

 that is, adapted for biting, as in the Hymenoptera and 

 Orthoptera. The metamorphosis is complete. The 



antennae usually have ten 

 or eleven joints. 



A small group of minute 

 insects, parasitic on bees 

 and other insects, has been 

 separated as an order Strep- 

 siptera, but it may be con- 

 sidered a suborder of 

 Coleoptera. 



Order Rhynchota (or 

 Hemiptera} 



From Bulletin 6 T , U. S. National Museum ^^ ,^ ^ cicadas, 



FIG. 95. A bug, Leptoglossus oppositiis, .. . j 



one of the Hemiptera. plant llCC, Scale inSCCtS, and 



