HOW TO KNOW THE IMMATURE INSECTS 



46b. Antennae short; 10th abdomincd segment without diverticles. 

 Fig. 226 Genus Eurypogon, DASCILLIDAE 



Some 500 rather widely- 

 distributed species are 

 known for this family. They 

 are found in damp places 

 and are small sized. The 

 adults are dull colored and 

 of rather soft texture. 



Fig 226. a, Eurypogon niger Melsh; b. 

 Half aspect of head; c, 9th and 10th ab- 

 dominal segments. 



47a. 8 pairs of abdominal spiracles, all projecting, either cribiform or 

 biforous but of a deviating sinuous type. 

 Fig. 227 Family CHELONARIIDAE 



Only one species of this small 

 family is known in the United 

 States. 



Fig. 227. Chelonarium sp. 



47b. Abdomii^ol spiracles vary from 1 to 8 pairs, either onnuliform or 

 regularly biiorous, never sinuous. 

 Fig. 228 Family DRYOProAE 



The larvae of Dryops is stated to live 

 in damp earth beneath stones. The 

 larva of one species of Psephenus is 

 said to resemble a trilobite except that 

 its lateral margins are notched. More 

 than 400 species are known. The aduhs 

 are named "long-toed water beetles." 



48a. 9th abdominal segment operculafe, vertical and terminal. 



Fig. 229 Family RHIPICERIDAE 



Fig. 228. Heimis aeneus Muller. 



This small family of "cedar 

 beetles" are dull colored and 

 of medium to large size. Their 

 life history is not well known. 



Fig. 229. Zenoa picea Beauv. 



93 



