404 ' PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



neig-hborin^ low plants. At the Half Way House on the Pikes Peak 

 Railroad, at a similar altitude to the places where this species occurred 

 so abundantly farther up the range, no specimens were seen and the 

 birches were uninjured. The species, therefore, seems to be local in 

 its appearance. Prof. C. P. Gillette spoke to me of this species as 

 one that he had long observed to be destructive to the birch. 



The larva lives under a delicate web which it spins over the surface 

 of a leaf, Keld above the surface by the curl of the leaf. It eats the 

 parenchyma on the upper side, skeletonizing the leaves, which become 

 brown and dry. 



CEROSTOMA RUBRELLA Dyar. 



Larva. — Flattened, the dorsal section rounded triangular, strongly 

 tapering at both ends. Head small, elongate, held nearly flat, with 

 broad high clypeus, vertex under joint 2; pinkish, mottled over the 

 lobes with large, pale brown spots; clypeus and epistoma, withantenine 

 and anterior thoracic feet whitish, somewhat mottled; ocelli and tips 

 of antenna dark; width 1 mm. Body thickest at joints 5 and 6; shields 

 nearly concolorous, not contrasted. Slate gray, dorsal line 3^ellowish 

 brown, pale yellow edged, a little irregular and clouded, faintly cutting 

 the cervical shield, which is pinkish graj", edged with neat black tuber- 

 cles; stigmatal fold obscure, faintly shaded in yellowish and brown. 

 Feet normal, pale. Tubercles small, black, distinct, whitish ringed; 

 iv and v separate, iv a little dorsad; on joint 3 ia and ib approximate, 

 separate on joint 4; iia + lib, iv + v. Set« distinct, brownish. A few 

 white lateral dots and some stigmatall}'; segments obscurely about 

 6-annulate. 



Solitary on the backs of the leaves, perfectly exposed and spinning 

 no web; on Berber is reiyens^ Boulder Creek Canyon; also in other can- 

 yons, but less commonly. Larva? active, jumping oti' the leaves when 

 disturbed. 



The moths resemble the European Cerostonui radlatella Donovan, 

 which has been recorded also from America. They are similar in 

 shape and size, and are like one form of that variable species in color- 

 ation. But they are not variable, my 12 specimens being absolutely 

 uniform, besides which the larva and food plant are difl'erent. I have, 

 therefore, thought them deserving of a distinct name. 



Palpi clothed with black and a few white scales, longer at the end of 

 the second joint; face black and white scaled; vertex with long red 

 brown vestiture, basal joint of antenna? and neck narrowly white; 

 antennte white and black banded below. Thorax and fore wings above 

 smooth red brown with bronze reflection, an obscure lighter ray from 

 the base along the submedian vein, distantl}' edged above with a few 

 black scales which are more distinct on the outer half of the wing. 

 Abdomen and hind wings silky blackish, as arc all the wings below, 

 the costa of fore wings only narrowly pale. Legs and abdomen below 

 pale gray, shining. Expanjsc, 14 mm. 



