318 . ELEMENTARY ENTOMOLOGY 



KEY TO THE FAMILIES OF LEPIDOPTERAi 



A. Lepidoptera with slender antennae, the tips of which are expanded or 



dilated. Mostly diurnal in habits. Butterflies and skippers. 

 B. Dilation of antennae terminated by recurved hook. Wing venation 



as in Fig. 261. Skippers. (Page 174) HESPERIDAE 



BB. Dilation of antennae not terminated by recurved hook. 

 C. First pair of legs normal, or simply reduced in size. 



D. First pair of legs reduced in size. Wing venation as in Fig. 448. 



(Page 178) LYCAENIDAE 



DD. First pair of legs normally developed. 



E. Front tibia without pads ; claws toothed ; cubital of fore- 

 wing three-branched. Fig. 452. (Page 1 78) . PIERIDAE 

 EE. Front tibia with pads ; claws not toothed ; cubital of fore- 

 wing four-branched. Fig. 449. Swallowtails. (Page 175) 



PAPILIONIDAE 

 CC. First pair of legs atrophied, without claws ; wing venation as in 



Fig. 451. (Page 179) NYMPHALIDAE 



A A. Lepidoptera with antennae of various forms but never enlarged at tip. 



Mostly nocturnal in habits. Moths. 

 B. Hind-wings with not over two complete anal veins. 



C. Second and third median veins arising together; m 2 " not arising 



from center of discal cell. 



D. Humeral vein present in hind-wing, arising at base of costal. 

 Fraenulum absent. Fig. 446. (Page 21 6) . LASIOCAMPIDAE 

 DD. Humeral vein absent ; fraenulum present. 



E. Subcosta and radius of hind-wing fused to near apex of 

 discal cell ; ocelli present. Tiger moths. Fig. 450. (Page 



207) ARCTIIDAE 



EE. Subcosta and radius of hind-wing distinct, or but slightly 



fused. 



F. Diurnal moths with simple antennae and contrasting 



coloration. Wood nymphs .... AGARISTIDAE 



FF. Nocturnal moths with simple or pectinate antennae and 



without contrasting coloration. 

 G. Ocelli absent; antennae pectinate. Tussock-moth. 



(Page 203) LIPARIDAE 



GG. Ocelli present; antennae usually simple. Owlet 



moths. Fig. 445. (Page 199) . . . NOCTUIDAE 



CC. Second and third median vein not arising together, arising from 



center of discal vein. 

 D. Fraenulum present. 



E. Subcosta and radius of hind-wing connected near base by 

 crossbar. Hawk moths. (Page 208) . . . SPHINGIDAE 



1 This key has been adapted from keys of Holland, Smith, Bunter, and others. 



