' LEPIDOPTERA 189 



EE. Fore wing without a free 3d A, hind wing with 2 anal veins. Cu (in 

 our species) apparently 3-branched. 

 F. Fore legs normal in size, used for walking. Usually 1 radial vein lost. 

 G. M2 arising from middle of end of discal cell. Head very narrow, the 



antennae slightly encroaching on the eye. p. 281 Lyc^enid^e 



GG. M2 arising from upper angle of discal cell or even (usually) 

 stalked with R3-5. Head wider, the eye a complete circle, p. 265. 



Pieridae 



FF. Fore legs reduced, often brush-like (except some 9's), not used for 

 walking. Fore wing with all veins (except 1st A and 3d A) almost 



always preserved, p. 268 Nymphalid^e 



CC. Antennas not swollen toward tip, or if so (Sphingidae, Agaristidas, etc.) with 



frenulum well developed. 



D. Hind wing with Sc and R closely parallel or fused beyond where R leaves 



the discal cell. (Closer than they are along the discal cell); base of M 



not preserved in cell. 



E. Wings long and narrow, fore wing 4 x as long as wide; wings interlocked 



by rows of spines near inner edge of fore wing and costa of hind wing. 



p. 207 



. .^GERIID/E 



EE. Wings relatively broader, hind wing but little longer than broad. 

 Wings not interlocked. 

 F. Hind wing with three anal veins, 1st A being preserved, p. 212. 



Pyralidid^e 



FF. Hind wing with 1 or 2 anal veins. Body extremely stout, projecting 



far beyond the wings which are narrow, p. 218 Sphingidae 



DD. Hind wing with Sc and R widely separated beyond end of discal cell 



(Sc rarely wholly lost) ; or (some Cossidae) with base of M fully preserved, 



forked in cell. 



E. Fore wing with M2 arising more than one-third of the distance from M3 to 



M 1 , so that Cu appears to be 3-branched. 



F. Hind wing with Sc and R touching, closely parallel or fused no 



second quarter of discal cell, then diverging before end of discal cell. 



G. Base of Sc sharply angled, and connected by a more or less distinct 



humeral vein to base of frenulum. Usually slender moths, p. 223. 



Geometridae 



GG. Sc gently curved at base, not connected to frenulum-base. Stout 

 moths. 

 H. Radius pectinate (with Ri, 2, 3, 4 given off successively from the 

 stem that leads to R5); frenulum rudimentary, p. 255. . Bombycid^e 

 HH. R3 and 4 most closely associated; frenulum functional, con- 

 spicuous in male. p. 227 Notodontid^e 



FF. Sc and R of hind wing diverging sharply almost from base. 



G. Hind wing with- two anal veins, upper discocellular vein (the portion 

 of vein bounding the discal cell between the points where R s 



and Mi leave it) short and transverse, p. 246 Citheroniid.e 



GG. Hind wing with only one anal vein or upper discocellular vein 



long and longitudinal (usually both), p. 249 Saturniid,e 



EE. Fore wing with M2 associated with Cu-stem, Cu therefore apparently 

 4-branched. 

 F. Sc and R of hind wing fused for second fourth of discal cell or more. 

 G. Vein 1st A preserved in both wings. 



H. Wings light colored, tongue absent, p. 197 Megalopygidae 



HH. Wings largely blackish, tongue strong, p. 197. . . Pyromorphid/E 

 GG. Vein 1st A lost in both wings (fore wing with 1 anal, hind wing 



with two) . p. 242 . Arctiim: 



FF. Sc and R more shortly fused, or not at all. 



G. Vein 1st A, preserved in one and usually both wings. 



H. Vein 1st A, a well-marked tubular vein (i.e., an ordinary vein) 



on fore wing, at least toward margin. 



I. Spurs of tibiae longer than width of tibia;, normally over twice as 



long, if somewhat shorter with base of media (in cell) simple, 



dividing the cell into two parts. 



J. Fore wing with R3 and 4 stalked (forking over apex) or 



united, in the latter case with only two radial veins running 



