698 BULi.ETIN UNITED STATES GEOLOGICAL SUEVEY. 



ash. Basal thiid of fore wiags tawny yellow, somewhat orange-colored 

 externally, outer edge of this colored portion directed regularly, oblique- 

 ly outwards from the costa to the inner edge, with three, black, venular 

 dots along this oblique border. In the ash space beyond is a distinct, 

 dark, discal dot, and the veins are black. A broad, marginal, tawny, 

 yellow band, the sides even and parallel. The costa, however, is cine- 

 reous to the apex. A marginal black line, and a fine dark line in the 

 cinereous fringe near the base. Hind wings of the usual hue. Abdo- 

 men luteous. Beneath, fore wings smoky, dusky towards the costa; a 

 pale, costal streak, not forming a submarginal pale line as in P. fenes- 

 trella. Legs dark ashen, whitish at ends of joints. 



" Length of body, $ , .50, 9 , .45 of an inch ; of fore wing, $ , .46, 5 , .45 of 

 an inch. California (Edwards)." — Packard^ I. c. 



I have examined the type (in bad condition) and three unset but fresh 

 specimens. The discal points are present, not absent, as Packard states. 

 This species agrees closely in form with fenestrella, but differs by the 

 ochery color of the basal and marginal fields of the primaries. 



I give here, for convenience of the student, two unrecognized descrip- 

 tions in this genus, by the late Dr. Clemens, in Proc. Acad. Nat. Sci. 

 Phila. p. 205, 1860. It must be confessed that Dr. Clemens's descrip- 

 tions in this group omit so many essential characters that it is doubtful 

 if the species he intends can be identified with certainty. 



"JN^. f ulmi-arrosorella. — Female. Grayish-fuscous. Fore wings with 

 a slender, dark fuscous angulated line, edged on the costa internally by 

 a pale grayish spot, and on the inner margin externally by another of 

 the same hue. The subterminal line pale gray, dark margined inter- 

 nally. Hind wings pale brownish, darker on the margin. 



"The larva is found on the American Elm in August. The head is 

 pale brown, dotted with dark brown. The body dark green, with a 

 dorsal, double line of pale green patches, and a slight subdorsal and 

 stigmatal line of the same hue. On the 1st, 2d, 4th, 5th and 10th 

 rings, are brown subdorsal points. It weaves a web on the surface of 

 the leaves, feeding beneath it. The pupa is contained in a web between 

 united leaves, in the vivarium. It becomes a pupa about the middle of 

 August, and an imago about twelve or fourteen days after transforma- 

 tion." 



^'N. undulatella. — Labial palpi, head and thorax grayish fuscous. 

 Fore wings grayish fuscous, with an angulated white line crossing the 

 disk, sometimes obsolete above the fold, margined with dark brownish, 

 and a subterminal line of the same hue dark margined on both sides. 

 At the end of the disk is a short blackish transverse line, slightly mar- 

 gined exteriorly with whitish. Hinder margin tipped with blackish, 

 cilia grayish fuscous. Hind wings grayish testaceous ; cilia paler. 



"Peaua., Canada and Mass. From Dr. Charles Girard, Washington, 

 D. C. 



