580 WILLIAM T. M. FORBES 



not reaching it; a yellow marginal stripe, edged with gray, and sometimes other 

 yellow streaks and shades between the white spots. Hind wing white on outer 

 half, fuscous on basal half, the boundary a straight perpendicular brown band 

 followed by a lead-colored line; postmedial region irregularly black-dusted. Ocel- 

 late marginal spots confluent, with excentric blue pupils, lying below the veins; 

 preceded by a white band and followed by a series of bright yellow bars. 12 mm. 

 (claudialis auct., not Walker.) 



July. 



District of Columbia to Illinois and Missouri, and south. 



II. M 2 lost, cell longer (fig. 347) ; larra in a iceb on submerged stones; with tracheal 

 gills (Argyractis Hampson, in part). 



3. E. bifascialis Robinson. White, lightly dusted with black; base of costa dark- 

 shaded; a broad dark vertical fascia just before middle, followed by a parallel dark 

 line; apical .region with three broad dark fasciae, tapering and converging to anal 

 angle, the first broader, darker, irregular, and bisected by an oblique white or silver 

 crescent. Markings sometimes almost wholly yellow, sometimes gray-brown, with 

 more or less yellow scaling, especially in the two outermost bands. Hind wing 

 with a broad transverse lead-gray fascia in the middle, ending abruptly at the fold, 

 preceded by a shorter yellow fascia, and the latter usually by a lead-gray bar; an 

 oblique black bar halfway between cell and apex; in the variety kearfottalis Dyar, 

 divided into two striae. A marginal waved lead-colored line, partly broken into 

 spots, preceded and followed by alternating black spots; the inner on the veins and 

 much the larger, the outer alternating with yellow liars. 12-15 mm. 



August and September.. The variety is only known from the Southwest. 

 New York to Wisconsin and south. New York : Waddington, Honeoye Falls, 

 Ithaca. 



4. E. fulicalis Clemens. Fore wing gray-brown ; an antemedial shade, oblique 

 inward, and a median line parallel to it; a short white bar before anal angle; a 

 pale shade in end of cell; a white perpendicular line from costa at two-thirds, and 

 a similar subterminal line, converging to a point above anal angle; a bright yellow 

 terminal line, edged with brown. Median area more or less powdery. Hind wing 

 white with a broad curved blackish antemedial band, followed by a finer line 

 parallel to its outer edge; postmedial region broadly dusted with black scales; 

 marginal markings as in E. bifascialis, preceded by a fine line of black scales. 

 1018 mm. (angulatalis Lederer, confusalis Walker). 



Larva on rocks, as described under the genus; moth in June and early July. 



Common and general in distribution. New York: Peru, Waddington, Lan- 

 caster, Niagara Falls, Jamestown, Honeoye Falls, Ithaca. 



There is considerable variation in detail, and more than one species may be 

 included. The names fulicalis and angulatalis apparently apply to large, rather 

 pale and evenly brownish-gray specimens, with a continuous fine black line before 

 the marginal lunules of the hind wing; and confusalis, to a small form with much 

 yellow shading, a fine black line on the hind wing, widely broken in the middle, 

 and a straighter dark median fascia. 



52. DIATHRAUSTA Lederer 



Palpi porrect, fairly long, triangularly scaled (fig. 351); maxillary palpi 

 triangular, hind wing with one median absent; otherwise like Nymphula. 



1. D. reconditalis Walker. Brown-blacK; faint yellowish antemedial and sinuous 

 postmedial lines (white on lower half of hind wing) apparently running directly 

 from the discal dot to above the anal angle; the reniform, orbicular, and clavi- 

 form, and the discal dot of the hind wing represented by quadrate hyaline white 



