8U 



accompanied externallj by a diffuse, wavy, brown shade. From the dark 

 shade, two diverging, conspicuous, black streaks follow the base of the median 

 veins, forming a rude =». Two similar, but parallel, black streaks follow (lie 

 origin of the two lower subcostal veins; beyond are two scalloped submar- 

 ginal lines; a marginal row of black triangular spots. Fringe whitish. Hind 

 wings whitish, with four waved lines, the two submarginal ones acutely zigzag. 

 A slight diseal dot. Beneath, the Tore wings are somewhat dusky ; the hind 

 wings pale-whitish, with a faint ochreous tinge. The diseal dots are more 

 distinct than above on both wings, with a common, sinuous, extradiscal line, 

 and a submarginal, fainter, double line, most distinct on the c.osta. Legs 

 whitish: fore legs dark in front. Abdomen whitish gray, with paler narrow- 

 rings. 



Length of body, $ , 0.43, 9,0.41: of tore wings, <?,0.45, 9,0.46; expanse 

 of wings, 1.12' inches. 



Quebec, Canada (Belanger); London, Canada (Saunders); Mount Wash- 

 ington. N. H., July 7 (Morrison and Sanborn); Catskill, N. Y. (Mus. Comp. 

 Zool.). 



Larva — "The eggs are laid about the 17th of July, and the young 

 caterpillars emerge about the 27th. They feed on mountain-ash or rowan- 

 tree (Pyrus aucupana), and, when full-fed, spin together a division of the leaf 

 of the food-plant, and change to a chrysalis." — Newman's British Moths, 76. 



This seems to be a truly mountain-species, not yet having occurred in 

 the lowlands. It is closely allied to E. dilutata, but is considerably smaller, 

 with more distinctly triangular wings and well-pectinated antennae; those of 

 the latter species being simple. The markings, which in their general 

 arrangement are closely similar to those of E. dilutata, differ in the extra- 

 discal line being straight on the costa, while there are more lines on the hind 

 wings. 



The present species differs from E. perliweata and 12-lineata in its much 

 larger size, the strongly-pectinated antennas, the straight extradiscal line, and 

 in the distinct V, &c, on the middle of the wing, though this is indicated in 

 both of the diminutive species. From E. dilutata it differs in its smaller size 

 and pectinated male antennae. 



There is not much variation among my specimens, which arc all well 

 preserved. In one specimen, collected by Mr. Morrison, the row of black, 

 short streaks, half-way between the extradiscal line and the edge of the wing. 



