ISTOETH AMERICAN EUCOSMINAE. 123 



I have seen no specimens of this species from the Shasta region 

 or any other California locality. In the Kearfott collection there 

 is a male labeled " Named by Walsingham," but it bears no locality 

 label. It diifers in a number of slight details of genitalia structure 

 from what we have been calling juncticilianu, and if the specimen 

 is from the type locality, the Rocky Mountain and eastern form 

 should be differentiated as a local race. For the present we may 

 assume that the common form represented in our collections is the 

 true juncticillana. 



Male genitalia figured from specimen in National Collection from 

 Tryon, North Carolina (" Fiske, 8-13-14"). 



Distribution according to specimens in National Collection, Ameri- 

 can Museum, and collection Barnes : Massachusetts, Maryland, Penn- 

 sylvania, New Jersey, North Carolina, Florida, Colorado, Wash- 

 ington, Manitoba, Ontario. 



Alar expanse. — 14-20 mm. 



Type. — In British Museum. 



Type locality. — Shasta County, California. 



Food plant. — Solidago. 



100. EUCOSMA EXCUSABILIS, new species. 

 (Fig. 158.) . 



Very like juncticilmna Walsingham, from which it only differs in 

 genitalia structure and the color of its palpi and head. The differ- 

 ences in the shape of the harpes are easily seen in the figures. 

 Walsingham's species has the cucuUus much narrower and the 

 costal angle of the cucullus much sharper than excusabilis. The 

 latter also has a more rounded, more constricted incurvation of the 

 neck of the harpe and a finer tufting of spines in the arch of the 

 neck of harpe than juncticiliana. Both species have the same pattern 

 and, except for the difference noted, the same color scheme. If 

 anything, excusabilis is a trifle the darker of the two, 



Male genitalia of type figured. 



Alar expanse. — 20 mm. 



Type. — In collection Barnes. 



Paratypes. — Cat. No. 24814 U.S.N.M., also in American Museum. 



Type locality. — Deer Park Springs, Lake Tahoe, California. 



Food plant. — Unknown. 



Described from three males from the Barnes collection, all from 

 the type locality. At first I took them to be only a form of junctici- 

 liana^ but the genitalia show that they represent a distinct species. 



