LEPIDOPTERA OF NEW YORK AND NEIGHBORING STATES 51 



75. R and M x of hind wing closely approximated or stalked; tongue usually present 

 (fig. 152) 76 



75. R and M! well separated at origin, usually half as far as at margin (fig. 137) ; 



1st A usually preserved at margin 79 



76. Wings Leavy and stiff, close-scaled; normally with all veins present and sepa- 



rate, RS running to outer margin, 1st A lost; maxillary palpi absent. 



Thyrididae (p. 521) 



76. Body and wings light, and soft-scaled; maxillary palpi perceptible, folded 77 



77. R, and R; stalked or united, both running to costa (fig. 155) ; 1st A lost. 



Gelechiidae (p. 255) 



77. R and Rj separate, or forking over apex, all veins present; 1st A strong 78 



78. Fore wing blunt, maxillary palpi of folded type Xylorictidae (p. 250) 



78. Fore wing falcate, maxillary palpi minute, but porrect. 



Yponomeutoidea (Cerostoma) (p. 341) 



79. RS running to costa (fig. 141) (Ecophoridae (p. 230) 



79. Rj running to outer margin or fore wing with not more than nine veins arising 



from cell 80 



80. R, and Rg stalked, forming over apex; ocelli minute or absent (fig. 138). 



(Ecophoridse (p. 230) 



80. R, and RS separate (fig. 200), or ocelli very large Yponomeutoidea (p. 335) 



81. Antennae with eye -cap, when folded back covering major part of eye 82 



81. Antennae with rudimentary eye-cap or none 83 



82. Palpi small and drooping or absent Lyonetiidae (p. 148) 



82. Palpi reaching beyond middle of front A few Gracilariidae (p. 161) 



83. Head with long, bristly vestiture covering vertex and face; tongue and maxil- 



lary palpi absent. . .* A few Tineidae (p. 116) 



83. Face at least smooth-scaled 84 



84. Hind wing with radial stem central, sending off a branch to costa near middle 



(Rj+s) and one to dorsal margin nearer apex (fig. 131). 



Douglasiidae (p. 224) 



84. R-stem not sending a branch to costa, or with the branch close to apex (fig. 



181, etc.) 85 



85. Hind wing lanceolate, at least a sixth as wide as long, with the R-stem running 



through its center (fig. 134) 86 



85. Hind wing with R-stem closely associated with Sc toward base, or lost; or wing 



linear with veins crowded (figs. 180, 186) 88 



86. Maxillary palpi distinct, porrect A few Gracilariidae (p. 161 ) 



86. Maxillary palpi obsolete 87 



87. Cu-stem of hind wing at least two-branched (fig. 129); cell usually formed; 



palpi usually upturned beyond middle of front Cycnodiidae (p. 218) 



87. Cu-stem of hind wing simple, free; palpi small, drooping (fig. 134). 



Heliozelidae (p. 225) 



88. Fore wing linear, with three or four simple veins only (fig. 221). 



Heliodinidae (Cycloplasis) (p. 356) 

 88. Fore wing lanceolate with branched veins but no cell (fig. 133). 



Heliozelidae (Coptodisca) (p. 225) 



88. Fore wing with formed cell 89 



89. Fore wing with only four veins running to costa, and five or six to inner margin 



(fig. 202), or hind wing with Mj widely separated from R at origin, often 

 stalked with M 2 Some Yponomeutoidea (p. 335) 



89. Fore wing with five veins running to costa or only three or four to inner margin ; 



R and M, approximate or stalked to hind wing 90 



90. Vertex rough or with a rough anterior crest 91 



90. Entire head smooth-scaled Lavernidae (p. 318) 



91. Accessory cell small or more often absent (figs. 115-120) hind tibiae less hairy, 



often smooth or bristled Gracilariidae (p. 161 ) 



