8(3 



acc(>iii|)Uiiie(l externally by a (lili'u.se, 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 the 

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

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

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

 A slight discal dot. Beneath, the fore wings are somewhat dusky ; the hind 

 wings pale-whitish, with a ftiint ochreous tinge. The discal 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 costa. Legs 

 whilisii ; fore legs dark in front. Abdomen whitish gray, with paler narrow 

 rings. 



Length of body, ^,0.43, 9,0.41; of Ibre wings, c?,0.45, 9,0.4(5; expanse 

 of wings, 1.12 inches. 



Quebec, Canada (B&langer); London, Canada (Saunders); Mount Wash- 

 ington, N. H., July 7 (Morrison and Sanl)orn); Catskill, N. Y. (Mas. Coinp! 

 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 {Fyrusaucupana), 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 antennas ; 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 difi'ers from E. perlineala and 12-Iiueata in its much 

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

 in (he distinct V, &c., on the middle; of the wing, though this is indicated in 

 l)oth of tile diminutive species. From E. dilutata it differs in its smaller size 

 and pectinated njale antenn;«. 



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

 preserved. In one s])ecimen, collected by Mr. Morrison, the row of black, 

 short streaks, half-way between tlie extradi-cal line and the edge of the wing, 



