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AA. Antennae pectinate. 
a. Wings moderately broad, containing large lunate spots. Psycomorpha. 
aa. Wings narrow. 
ft. Hind wings ovate, opaque. ....Acoloithus. 
6ft. Hind wings partly transparent. Ctenucha. 
Family 4 —Bombycid^:. 
A. Body rather slender. 
a. Antennae simple in both sexes; pilose below in the males. Utethesia. 
aa. Antennae simple, two strong setae at each joint. Callimorpha • 
AA. Body robust. 
a. Size medium, body not pilose. 
6. Male antennae, and sometimes the female, pectinate. 
1. Wings rounded, marked with angular black patches. Arctia. 
2. Fore wings pointed, deep ochre. Pyrrharctia. 
3. Fore wings pointed, female white. Leucarctia. 
4. Wings rounded, white, with a few spots ; abdomen ochre . Spiloroma. 
5. Fore wings long, leopard spotted. Ecpantheria. 
6. Small, white, without spots.. Hyphantria. 
1 7. Pale ochre, fore wings banded, shoulder tufts tipped with green. Halesidota. 
8. Antennae heavily pectinate, female wingless. Orgyia. 
66. Male antennae simple. 
c. Fore wings with subcostal vein trifid beyond discal cell. Empretia. 
cc. Fore wings with subcostal vein bifid beyond discal cell. IAmacodes. 
666. Male antennae pectinate. 
c. Female wingless, wings of male transparent. Thyridopteryx. 
cc. Female winged. 
d. Male antennae minutely pectinate, female minutely serrate. Datana. 
dd. Female antennae serrate. Notodonta. 
ddd. Male antennae not pectinate to apex. Edema. 
aa. Size large. 
6. Eye spots in both wings, antennae strongly pectinate. 
c. Eye spots transparent. 
d. Color brownish or ashy ochre. Telea. 
dd. Color green, hind wings tailed . Actias. 
ddd. Color reddish brown or ferruginous . Callosamia. 
cc. Eye spots opaque. 
d. Color grayish brown. Platysamia. 
dd. Color grayish olive.Samm. 
66. Eye spots in hind wings only, or wanting. 
c. Eye spots in hind wings... Hyperchiria. 
cc. No eye spots in wings. 
d. Antennae pectinate in the males, serrate in the females. Eucronia. 
dd. Antennae of males serrate about one-third their length, females simple. Eacles. 
ddd. Antennae of males pectinate more than half the length, females simple .Dryocampa. 
aaa. Size medium, body pilose. 
6. End of wings denticulate, antennae very short. Oastropacha. 
66. End of wings not denticulate. 
c. Color russety brown . Clisiocnmpa. 
cc. Color hoary, wings crossed by black reticulations. Xyleutes. 
Family 5 —Noctuid*. 
A. Thorax and abdomen without dorsal tufts; eyes naked. 
a. Fore wings with psi mark near hind angle. Acronycta 
aa. Fore wings without psi mark. Agrotis 
B. Thorax and abdomen with dorsal tufts. 
a. Tibae without spurs. 
6. Eyes naked. Hadena 
66. Eyes hairy. Mamestra. 
aa. Middle and hind tibae spurred. 
6. Fore wings narrow ; apex obtuse or acute, 
c. Eyes hairy. Ceramica. 
