ARTHROPOD A— INSECTA. 445 



Tertiary species have been obtained from the OHgocenic of Colo- 

 rado and Wyoming (Homoeogamia ventriosa Scudder, Zetobora 

 brunneri Scudder), from Florissant, and Paralatindia saussurei 



Scudder from the Green River beds of Wyoming. 



Order ISOPTERA Brulle. 

 (Termites, white ants.) 



Small or moderately sized insects, integument slightly chitinized, 

 power of flight small or wanting; wings when present delicate, 

 almost alike, with small rudimentary but defined anal area. C and 

 Sc shortened, simple, often fused ; R originating near the base, 

 with more or less pronounced branching; M independent through- 

 out, more or less branched ; Cu with numerous branches directed 

 towards the posterior border; regular cross-veins absent, but a 

 very delicate net-like supplementary neuration wrinkles the surface. 

 350 Recent, 6 Quaternary and 61 Tertiary species are known. 



The termites (Termitidce) have numerous American representa- 

 tives in the Oligocenic of Colorado {Parotermes, three species; 

 Eiitermes, four species; Hodotermes, two species, etc.). 



Order COLEOPTERA (Linn.) Degeer. 

 (Beetles.) 



With thick chitinous fore wings, the nervation of which is obso- 

 lete ; these are the elytra, which cover the thinner folded hind 

 wings, the nerves of which are connected only at intervals. C 

 faint, M generally much reduced, Sc, R and Cu always well de- 

 veloped but slightly or not at all branched ; secondary ribs promi- 

 nent. In the hind wing, M is not strongly developed, R and Cu 

 are well developed and mostly forked; anal veins generally well 

 developed. 



The total number of Recent species of Coleoptera is about 172, 

 500; of Quaternary 373, 95 of which are American, 75 of these 

 having been obtained from the interglacial and post-glacial beds of 

 the Scarboro Heights region in Ontario; of Tertiary species 2,285 

 have been described, 340 of these being American. 



The division of the Rhynchophora is represented in the Cretacic 

 (Comanchic?) of Greenland (Curculiopsis cretacea Heer, Archio- 



