114 ZYGiENIDvE AND BOMBYCID.E 



above in G. Iremuli/olia, in which also the veins are clothed with almost 

 concolorous scales, whereas in G. Mildei they are clearly separated by 

 their reddish color from the dusky outer marginal band. 



It differs from G. Americana, Harris, in wanting the pale band and 

 crescent shaped pale spot on the primaries, and by its smaller size ; 

 from G. ferrugiiiea, Packard, it may be distinguished by the presence 

 of greyish shades on the wings ; from G. Cait/ornka, Packard, it may 

 be separated by its smaller size, the forewings having a length respect- 

 ively in the 5 of 0.60 and 0.75 inch, and by the strong ferruginous 

 tint of the primaries ; and lastly from G. Alascensis, Packard, the only 

 remaining American species, by the color of the wings beneath, which 

 are not " uniformly dark chesnut brown, much as above ; with the 

 outer band distinct, and with large triangular dusky spots between the 

 venules," but are quite pale at the base, with the 7niddh band distinct, 

 while the outer half of the wing is slightly hoary on a reddish ground, 

 with the veins scarcely distinguishable by difference of color. 



At the suggestion of my friend Mr. James Behrens who took the 

 type of this insect, in Alameda County, I have retained his manuscript 

 name of G. Mildei, so called after the well-known Professor Milde of 

 Lubeck in Germany, to whom the Entomologists of the Pacific Coast 

 are indebted for many courtesies. 



