317 



11. P. ochrocomella Clemens. Basal third of fore wing nearly white, gray at the 

 extreme base, with contrasting blackish costa and thorax; outer two-thirds blackish, 

 more or less powdered with white and often heavily shaded over the end of the 

 cell, leaving the dark discal dots contrasting, and a darker bar halfway between 

 them and apex; the region beyond the antemedial fascia contrastingly dark. Dark 

 specimens have only the discal bar defined with whitish. The outer boundary of 

 the fascia is typically erect, but markedly curved in the usually darker var. 

 heidemannella Dietz. (Epigritia Dietz; E. palUdotincteUa Dietz.) 



Late July and August. 



Southern Connecticut to Pennsylvania. A pale form occurs in Missouri. 



8. DRTOPERIA Coolidge 

 (Dry ope Chambers, not Desvoidy) 



Exactly like Pigritia except for the separation of M, and M s in the fore wing. 

 Palpi minute in both sexes, a little smaller in the male; first, and often second, 

 joint with a triangular tuft below, rough-scaled, third joint shorter, and some- 

 times very small. 



Key to the species 



1. Immaculate ochreous 6. ochreella. 



1. A distinct antemedial fascia with zigzag outer boundary, followed by dark. 



2. Fore wing gray 1. grisella. 2. tenebrella. 



2. Fore wing more or less yellowish. 



3. Orbicular represented by a distinct dot 5. discopunctella. 



3. Orbicular obsolete 4. murtfeldtella. 3. fuscosuffusella. 



1. D. grisella Dietz. Light powdery gray, the costa darker, especially toward 

 base, the dark showing as powdering on a paler ground. Base dark; antemedial 

 fascia zigzag, not reaching costa, diffuse inward, outwardly defined by a contrast- 

 ing blackish shade which is strong at costa and forms a patch in the fold, but is 

 practically interrupted in the cell. Ground outwardly pale, powdery; the two 

 discal dots formed of the powdering, distinct but diffuse, and followed by a blackish 

 shade across the apex. 12 mm. 



April. 



Pennsylvania; Missouri; South Dakota. 



2. D. tenebrella Dietz is very close to the preceding species, of which it may be 

 a variety; apparently it is slightly paler, with the dark antemedial shade weaker 

 and not forming so distinct a spot below the cell. 12 mm. 



Pennsylvania; Kentucky. 



3. D. fuscosuffusella Dietz. Pale ochreous, with dark fuscous dusting and shading, 

 grayer than D. murtfeldtella. Antemedial fascia of white dusting followed by a 

 blackish patch on the costa, the patch rarely extended diffusely toward the apex; 

 a similar patch on inner margin. Outer part of wing normally dusted with white; 

 with weak discal dots. 11 mm. (Not seen.) 



St Louis, Missouri. 



4. D. murtfeldtella Chambers. Dull light ochre, shaded with pale brown; ante- 

 medial fascia pale, rather narrow, toothed at middle, heavily shaded with brown 

 except on the tooth, extending faintly across the brown costal edge. Base shaded 

 with light brown; subterminal region also shaded with light brown; and discal 

 dots faintly indicated by a red-brown shade, all somewhat dusted with whitish. 

 12 mm. (ochrocomella Dietz, not Clemens; erratella Dietz). 



Pennsylvania specimens are duller clay color, with dark shading and dusting, 

 the discal dots distinct, the antemedial dark shade excurved, interrupted and 



