101 



rluced, more distinct on the costa ; the discal dot on the hind wing quite 



distinct 



Length of body. <?, 0.50, 9, 0.55; of lore wing, $ , 0.64, 9,0.68; 

 expanse of wings, l.oO inches. 



California (Edwards and Behrens) ; Victoria, Vancouver Island, July 

 (Crotch, Mus. Comp. Zool.) ; San Francisco, Cal. (A. Agassiz, Mas. Comp. 

 Zool.). 



Differs from H. sordidatam the quite different arrangement of the bands, 

 which are of a peculiar smoky color, not reddish, and appearing as if trans- 

 lucent ; by the outer edge of the wing not being smoky ; and by the rectan- 

 gular apex. The wings in some specimens have a decided reddish tinge to 

 the brown. Two specimens from Vancouver Island are exactly like, the 

 Californian ; in another, the ground-color of the wings is Scotch-snuff colored. 

 Rubbed specimens show the bands very distinctly. 



A peculiar, green female, rece'ived from California through MT. Behrens, 

 differed so much from the others that it was described as distinct under the 

 name of Hydriomena viridata. I append a description of this interesting 

 variation. It was in a perfect state of preservation, and closely allied structu- 

 rally and as regards size to the ordinary form, the palpi being long, and ex- 

 tended as far in front of the head as the latter is long; the outer edge much 

 as usual, being less oblique than in some other species; the third subcostal 

 interspace is narrower than in the other specimens. Head, thorax, and 

 fore, wings deep sea-green, mixed with dull, dark, smoky-ash, and some 

 yellowish-green and a few black scales. Palpi with no green scales, but 

 black and pale ash, being darker below than above. Antenna; finely ringed 

 with white and blackish. Fore wings of a sea-green ground-color, with 

 numerous fine, transverse strigae, crossed by five clear, smoky-ashen, sinuous 

 bands, finely edged with black ; the basal very short and narrow, close to the 

 base of the wing ; the second line is narrow, ends farther from the base of 

 the wing on inner than on costal edge, and is angulated outward conspicu- 

 ously on median vein. The third band is close to, and parallel with, the sec- 

 ond, and twice as wide ; it is bent outward on the median and submedian 

 veins. A fourth, faint, narrow band, close to third. The fifth, or submarginal 

 line, is twice as broad as third, and 'very remote from the latter (which is 

 within the middle of the wing) ; it is nearly straight on the inner edge, 

 though curved outward just below the costa, while the outer edge is deeply 



