244 WILLIAM T. M. FORBES 



Key to the species 

 1. Black longitudinal mark reaching base of wing. 



2. Line heavy, the basal part strongly curved, and running from extreme base 



of costa across Sc and R 5. packardella. 



2. Line more slender, running straight out in fold 4. aurorella. 



1. Black mark, if present, not reaching base. 



2. A heavy irregular black bar over disc 3. merriccella. 



2. No definite black marking. 



3. With conspicuous black terminal dots, and dots on disc. 



2. megamicrella. 

 3. Evenly powdery gray; terminal dots absent, and dots on disc diffuse. 



1. inornata. 



1. S. inornata Walsingham. Powdery ash gray; outer half of fringe white with 

 gray-stained tips; usual marks indicated by a slight irregularity of the dusting. 

 Hind wing of the lighter ground color, the base of the fringe distinctly powdered. 



This species is easily confused with the next, but is apparently the only one 

 A-hich normally has CUj and Cu 2 stalked. 

 Ottawa, Ontario; Pennsylvania; Manitoba. New York: Ithaca, Karner. 



2. S. megamicrella Dyar. Whitish, powdered with light brown; a double ante- 

 medial black dot on cell and a distinct black lunated discal bar, in some specimens 

 broken in the middle; a rather distinct series of dark subterminal dashes run- 

 tting parallel to outer margin. Hind wing nearly white, with a faint continuous 

 pale gray line in base of fringe. Cu^ and Cu 2 of fore wing may be stalked. 

 18-25 mm. 



April and May. 



Massachusetts to Ohio. New York: Ithaca; East New York, Long Island.. 



3. S. merriccella Dyar. Closely similar to 8. packardella, but rather more dis- 

 tinctly striate, the black dash not reaching the base of the wing. 25-30 mm. 

 (H 48:38.) 



May. 



New Hampshire to western Pennsylvania. New York : Big Indian Valley, 

 Albany. 



4. S. aurorella Dyar. Light gray, dusted somewhat irregularly with dull brown. 

 Black basal dash fine, nearly straight, starting at base of costa, but running 

 almost wholly in fold; its outer end attached to a curved line running up into 

 cell, and often connected with the crescentic discal bar. Obscure dark dashes 

 in the subterminal region, and a postmedial dash in fold. Terminal dots strong. 

 Hind wing pale gray. 25-30 mm. 



New York to Manitoba. New York: Ithaca, Big Indian Valley. 



5. S. packardella Clemens. Gray, slightly streaked and dusted with brown. 

 A heavy black bar running from base of costa out along base of R, then curving 

 down into fold, and then up across cell to middle of costa. A slender branch run- 

 ning toward base of wing in fold, and a thicker one from where it crosses R 

 to lower angle of cell; the latter bar convex outward. Hind wing pale gray. 

 25 mm. 



June. 



Northern Atlantic States. New York: Ithaca, Big Indian Valley, Albany. 



10. ETHMIA Hiibner 

 (Psecadia Hubner; Anesychia) 



Molh similar to Semioscopis. 'Sensory area on antennae more extensive, cov- 

 ering half the antennae, even at the base. Palpus without any tufts on second 

 joint. Fore wing (fig. 142) narrower, with Cu t and Cu 2 widely, separated at 

 origin and nearly straight. Hind wing with R often preserved, M 2 rather nearer 



