690 WILLIAM T. M. FORBES 



Caterpillar (fig. 439) with a caudal process about as long as head, with sub- 

 equal hairy warts on meso- and metathorax and second segment of abdomen, and 

 minute ones on eighth segment. 



1. D. arcuata Walker. Typically cream-white, the area before the postmedial 

 line with fine brown wave lines; postmedial in a smooth curve from just beyond 

 middle of costa to apex, then in an even curve to outer third of inner margin, 

 with a blackish shade below it at apex; discal dot fine, black. Hind wing similar 

 toward inner margin, pale on costal half. Summer form genicula Grote (H 41:22), 

 straw yellow, and less strongly striate, the upper leg of the postmedial line 

 often lost. 30 mm. (H. 41:23.) 



The forms are not entirely seasonal and intergrade. 



May and June; August. Caterpillar on birch and alder. 



Pennsylvania to Indiana and north. New York: Plattsburg, Peru, Old Forge, 

 Mt. Marcy, Lewis County, Lancaster, Ithaca, McLean, Trenton Falls, Rhinebeck, 

 Big Indian Valley, Poughkeepsie, New York City, Staten Island; general on Long 

 Island. 



3. FALCARIA Haworth 



(Edaptera Packard; Drepana, in part) 



Similar to Drepana, but with the outer margin regularly scalloped (fig. 438), 

 the deepest scallops on C^ and Cu 2 (not as usual between veins); and hind wing 

 slightly waved. Caterpillar with strongly enlarged warts on meso- and meta- 

 thorax and on eighth segment of abdomen; caudal process about as long as the 

 height of the head. 



1. F. bilineata Packard. Typically -cream-white, heavily striate with brown 

 (in the late-summer variety levis Hudson, bright yellow and hardly striate); 

 with two parallel and nearly straight oblique brown lines, the outer cutting the 

 lower angle of the cell; discal dot minute. 28 mm. (H 41:7.) 



Caterpillar on birch. 



New Jersey and north. New York: Plattsburg, Wilmington, Albany, Brooklyn, 

 Staten Island. Variety levis Hudson is known definitely from Plattsburg, Wil- 

 mington, Alpine, Saratoga, Westchester County, and Brooklyn. 



4. ORETA Walker 



(Drepana, in part; Dryopteris) 



Eyes relatively large; palpi rudimentary; tongue invisible; antennae deeply 

 laminate, not pectinate. Fore wing falcate (fig. 437), extreme apex rather blunt, 

 on R,; outer margin more abruptly notched below it. R 2 arising from the acces- 

 sory cell, which is extremely long; hind wing without frenulum, with a rudi- 

 mentary humeral vein arising from the much-thickened base of Sc. 



Caterpillar with a prominent unpaired hump on metathorax; caudal process 

 twice as long as head. Pupa as described in the superfamily, showing the short 

 tongue and large eyes. The two nominal species are doubtfully distinct. 



1. 0. rosea Walker. Pinkish or purplish brown, striate with darker brown, 

 out to postmedial line ; subt'erminal region bright yellow ; outer margin dark 

 brown; hind wing with outer third yellow and only apex dark brown; antemedial 

 line obscure, darker, distinct, and parallel to postmedial on lower part of wing; 

 postmedial from three -fourths way out on costa, acute -angled on costa, and then 

 oblique in, to two-thirds way out on inner margin. Subterminal line sometimes 

 indicated by blackish dots. Under side similar. Variety marginata Walker is 



