ARTHROPOD A— INSECTA. 451 



Order RHAPHIDIOIDEA Handlirsch. 

 (Snake flies, etc.) 

 Neuropterous insects with slender abdomen, large head, and 

 greatly prolonged prothorax, which, with the contracted back of 

 the head, forms a long neck. Wings similar, of nearly equal size; 

 C marginal, Sc extending to the prominent pterostigma, R and Rs 

 divided distally into several branches ; M confluent basally with R, 

 much branched ; Cu repeatedly forked. Anal veins forming several 

 irregular cells, of moderate size, and never fan-shaped in arrange- 

 ment. Forty Recent and seven Tertiary species are known, five of 

 them from Florissant. Examples: Inocellia veterana Scudder, and 

 three other species; Rhaphidia? tranquilla (Scudder). 



Order NEUROPTERA (Linnsus) Handlirsch. 

 (Lace zvings, ant-lions, etc.) 



In the emended sense, the term Neuroptera includes only a 

 limited number of species (1,300 Recent, 27 Tertiary and Quater- 

 nary). The American fossil forms belong to the Osmylidce (Os- 

 mylus requietus Scudder, from Florissant), the H enter obidce 

 ( Bothromicromus lachlani Scudder, from Quesnel, British Colum- 

 bia, Oligocenic), Chrysopidce or lace-wing flies (Palaeochrysa 

 stricta Scudder, and Trihochrysa, 3 species, from Florissant, Colo- 

 rado). 



Mostly slender, often very small insects, with the power of flight 

 well developed; wings mostly similar, delicate; C marginal, Sc 

 extending nearly to apex of wing, generally with numerous branches 

 or cross-veins towards the costa; R close to Sc, forked near the 

 apex of the wing; Rs beginning generally near the base of the 

 wing nearly always with oblique backward directed branches, which 

 fork distally; M generally less strongly branched, Cu generally 

 more strongly so ; anal area not defined, with few irregular veins ; 

 cross-veins generally numerous ; pterostigma seldom developed. 



Order PHRYGANOIDEA Handl. 

 (Caddis flies.) 

 Moderately sized insects, with well developed similar, delicate 

 but hairy wings; logitudinal veins moderately branched, cross-veins 



