1914] Forbes—The North American Families of Lepidoptera 61 
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Hind tarsus ordinarily not more than eight times as long as thick, often with 
reduced tibial spurs; M2 reduced only in Eubaphe; in the rest of full strength 
and associate with cubital stem; moths often stout; Sc very much swollen 
Ce STIS 9 ncletesicS U6 ar a Cace aR Go CIO oa eR RCO ED Racecar Eaa many ARCTIID® 
Hind tarsus ordinarily much more slender, the tibia with long spurs; M2 usually 
well separated from cubital stem, though nearer it than radial, and often 
weaker than the other veins; Sc not more than twice as thick as R in their 
basal portion; usually slender moths.................... some Nocrurpzs 
Tympanic bull enlarged dorsally, showing from dorsal side as two rounded 
bosses on the first segment of the abdomen; brilliantly marked species 
PERICOPIDA 
ymipanicyoulleenncCOnsplCUOUS| ene ee cirri cereal 49 
White or yellow species with palpi not reaching the middle of the smooth- 
scaled front, and four-branched Cu in both wings... . . Arctiupa (Haploa) 
Species with longer palpi, three-branched Cu in hind wings or gray ground 
GOO 5 155 ae Sie OL eRGne EMCI a noc Mt earuceties he cher pee most Nocruips 
Fore wing with raised scale-tufts, small, with Sc and R ordinarily fused to near 
middlerotecellMbuteireerat baSemes ses saeco ae oa cer erie eee Not 
Horeawinesismoothly scaled irene seers eet aie Sherr ners oil 
Se and R of hind wings fused for a point about middle of cell, or connected by 
AVCLOSSaV CLI A CR Cee teen ree ictal ne ea tate earn most LyMANTRIIDZ 
Se and R fused from base to middle of cell............... most LirHosirpa 
Legs lost, never leaving cocoon.................--- Psycurp (9s in part) 
\iviiilin, saoraanell eres 8 Ge pn nl tee e eel ons Gani ia Deny cleanin a ealols cla 53 
Cocoon seedlike, with a valve at one end (being formed of the larval case), 
the moth normally not leaving it........ Ae Nese ee Psycuip (@s in part) 
Cocoon normally felted of the larval hair, or rudimentary and underground. .54 
Abdomen closely scaled, or spined, or with bristling dark gray hair 
: GEOMETRID (a few 9s) 
Abdomen smoothly clothed with fine light woolly hair; moth not normally 
leaving the cocoon, which is composed of the larval hair 
LyMantTRupD&® (a few 9s) 
Fore wing with three or four unbranched veins only..................+-- 56 
Horexwine withysome)brancheds ves. s2e) ne ose ase ee acl cia esl 57 
JN” BV GRE NGN ASM 0) Sst sekok Bho pe bict Davin. xs CEG achcrEG aces erera SE ee OpostTEGID 
INOREVECADE Tie cette PR Rear eyes ona os eater ene HELIOZELID® in part 
A well-developed eyecap, fringed with overlapping scales; labial palpi small, 
cellislend erorkwanbin ghee rc aoe ie ee ae acres ere o.crake se 58 
Eyecap not developed,—at most with first joint of antenna large, a little hol- 
lowed on inner side, and fringed with a single row of bristles (pecten)...59 
Cell very small, less than a tenth area of wing, or wholly absent; membrane 
ENOTIGEWSE 8 'G.o oto cio-b ton ols EIS RO ERCEV ING © RONNIE TENS nT RO oe ane NeEpricuLip# 
Gell larcery membrane not aculeate:.25..----2+-+.5-:-+--5- >= LYONETIIDE 
Maxillary palpi twice as long as eye, folded, conspicuous......... PRODOXID# 
Maxillary spalpishortersthanveye.sor pOLrect aerate acide ska cicl-eralencrslerel- 60 
