GENUS EREBIA 189 



or confounded with the next species, so they are put close together 

 for comparison. 



259. Satyrus Silvestris. 



Plate XXIV^ : Figures 259, a. 



Fig. 259, Male, Truckee, Cal., 1890; Author. 



a, Male, underside, Truckee, Cal., 1890; Author. 

 This has been called a variety of the preceding, Charon, but it 

 is abundantly distinct. The whole butterfly is darker, and espe- 

 cially on the underside the difference is well marked. I have fig- 

 ured the underside of the male of each species, and have placed 

 them as close together as possible, for the purpose of compari- 

 son. The underside of Silvestris is a homogeneous dusky or 

 brownish-black, quite different from any other Satyrus. 



260. Satyrus Sthenele. 



No figure. 



This species is now considered extinct. It was taken on Lone 

 Mountain, to the westward of the city of San Francisco, in the 

 early days of that city, and was at that time common ; but eventu- 

 ally it disappeared, at about the same time as another species, 

 Lycrena Xerces, and it has not returned, although the Xerces, 

 after being absent about thirty years, has reappeared. So it is 

 probable that Sthenele will in time also come back again, at some 

 nearby place, if not in that particular spot. 



The description is: "Expanse, 1.2 to 1.5 inches; brown; fore 

 wings with two white-pupilled ocelli, circled with yellow ; hind 

 wings without spots ; under side ashy-gray, deepest at base ; fore 

 wings with two large pupilled ocelli circled with yellow : hind 

 wing crossed by broad angular band, and marked near anal angle 

 with two little ocelli." 



Genus EREBIA. 



The species comprising this genus are all rather small in size, 

 very dark brown in color ; usually eyed on one or on both wings. 

 Most of them are arctic in habitat, or found on the high mountains 

 in the temperate regions. 



There are none of them now known on the immediate West 

 Coast, and only one in the Yellowstone Park and Alaska, though 



