LEPIDOPTERA OF NEW YORK AND NEIGHBORING STATES 49 



50. Hind tarsus ordinarily much more slender, the tibia with long spurs; M 2 usu- 



ally 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; hood surrounding spiracle 

 (fig. 16), except in some slender species Some Noctuidae (p. 42) 



51. Tympanic hoods enlarged dorsally, showing from dorsal side as two rounded 



bosses on the first segment of the abdomen, separated by a third of the 

 width of the abdomen; brilliantly marked species Pericopidae 



51. Tympanic hoods less conspicuous dorsally; separated by half the width of the 



abdomen .52 



52. White or yellow species with palpi not reaching the middle of the smooth- 



scaled front, and four-branched Cu in both wings; hood above spiracle, con- 

 spicuous Arctiidae (Haploa) (p. 42) 



52. Species with longer palpi, three -branched Cll in hind wings or gray ground 



color; and lateral hood Most Noctuidae (p. 42) 



53. Fore wing with raised scale-tufts; small species with Sc and R ordinarily fused 



to near middle of cell but free at base Nolidae (p. 43) 



53. Fore wings smoothly scaled 54 



54. Sc and R of hind wings fused at a point about middle of cell or connected by a 



cross vein, or closely parallel Most Lyman t riidse 



54. Sc and R fused from base to middle of celL 



Most Lithosiidae and Menopsvmus (Noctuidae) (p. 42) 



54. Sc sharply divergent from R at base, then angulate and becoming closely 



approximate or fusing with it A few GeometridJe (p. 41) 



55. Legs lost, moth never leaving cocoon Psychidae ($s in part) (p. 140) 



55. With normal legs 56 



56. Cocoon seedlike, with a valve at one end (being formed of the larval case), the 



moth normally not leaving it; moth less than 6 mm. long. 



Psychidae ($s in part) (p. 140) 



56. Cocoon normally felted of the larval hair, or rudimentary and underground; 



moth more than 6 mm. long 57 



57. Ocelli present A few Arctic Noctuidae (p. 42) 



57. Ocelli absent 58 



58. Abdomen closely scaled, or spined, or with bristling, dark gray hair. 



Geometridae (a few $s) (p. 41) 



58. Abdomen smoothly clothed with fine light woolly hair; moth not normally 



leaving the cocoon, which is composed of the larval hair. 



Liparidae (a few $s) (p. 42) 



59. Maxillary palpi conspicuous, folded in resting position (fig. 49). 60 



59. Maxillary palpi straight and porrect (fig. 3), or rudimentary 64 



60. Antenna with large eye-cap, larger than eye 61 



60. Eye -cap rudimentary or absent; fore wing with large cell and branched veins. .62 



61. Fore wing with branched veins, normally with a small, four-sided cell (figs. 



52-57) Nepticulidae (p. 79) 



61. Fore wing with three or four simple veins only (fig. 113) . .Opostegidae (p. 160) 



62. Head entirely smooth, R B , when distinct, running to costa (fig. 114). 



Oinophilidae 



62. Head with a few erect hairs; Rj present and running to outer margin (fig. 

 202) Yponomeutidae (Acrolepia) (p. 343) 



62. Head tufted, at least on vertex ; R 5 running to costa 63 



63. Wing membrane aculeate (fig. 30) ; Sc of hind wing with a strong basal fork 



(the lower fork being R t ), or considerably swollen at base, R and Sc usually 

 sharply divergent from base; vertex very rough (figs. 43-45). 



Moat Incurvariidae (p. 72) 



