488 



but tlie wing is ochreous, with a distinct yellowish tinge, and is densely 

 speckled with brown, uniformly on both wings. 



Length of body, ^, 0.45-0 55, 9, 0.45; of fore wing, cf, 0.70-0.72, 

 9, 0.60-0 70; expanse of wings, 0.95-1.35 inches. 



Brunswick, Me., June 25 to July 10, not common (Packard) ; sides of 

 Mount Washington, N. H., July (Morrison); Natick, Mass., June 29 (Stratton) ; 

 Albany, N. Y. (Lintner) ; South Carolina (Sachs); Victoria, Vancouver's 

 Island, July (Crotch, Mus. Comp. Zool.) ; Sanzalito, Cal. (Behrens). 



This widely-distributed species may be known by the uniform rust- ash 

 color, with the broad darker mesial band sending the three attenuated teeth 

 along the venules, and by the irregular lilac band on the under side of the wing. 

 It is liable to be confounded, from the thinness of the wings and the style of 

 coloration, with the species of Therina. 



I can find no differences between our specimens from New England, 

 California, or Europe, that would even indicate climatic varieties. The Cali- 

 fornian ones do not at all vary from New England examples. In the European, 

 the band is a little narrower on the inner edge, the sinus being shallower; 

 but, in the coloration, there is absolutely no difference. In size, the Europeans 

 are larger than the Eastern American, and like the Califbrnian, the latter 

 slightly exceeding any of my European examples. Expanse of wings of the 

 New England specimens, 0.95-1.26; European, 1.2f;-1.30; Vancouver's 

 Island and Californian, 1.40 inches. These facts confirm what has been 

 seen in other species, that European and Pacific-coast examples of the same 

 species are usually larger than New England or Atlantic-coast specimens. 



The only important variation observed is a variety figured on plate 9, 

 fig. 55, from Natick, Mass. It is a male, and smaller than usual, with the 

 wings opaque, the mesial band confused with the outer, part of the wing, 

 and narrower than usual, and there is a broad diffuse shade on the hind 

 wings. 



Larva — "Mr. Merryfield has described the general color of the cater- 

 pillar as purplish-brown, varied with ochreous ; the head is bifid, light ochre- 

 ous-brown, especially in front; a brown ochreous stripe, lightest at the upper 

 edge, along the upper part of the side of the fifth segment. On each segment 

 from the filth (inclusive) backwards, is a pair of very small points, which are 

 light in front and dark behind, besides smaller points just behind the spira- 

 cles. A pair of large warts on the back of the ninth segment, a pair much 



