Arctiidse 



is pure white. Tiie body of the specimen on our plate is 

 greasy, and hence too dari<, 



(2) Diacrisia latipennis Stretch, Plate XVI, Fig. 6, $ . 

 (The Red-legged Diacrisia.) 



The coxx and femora are pinlc or reddish. The insect is 

 common in Pennsylvania, and the Atlantic States generally. 



(3) Diacrisia rubra Neumoegen, Plate XIV, Fig. 32, $ . 

 (The Ruddy Diacrisia.) 



The habitat of this species is British Columbia, Oregon, 

 and Washington. 



(4) Diacrisia vagans Boisduval, Plate XIV, Fig. 33, $ , 

 Fig. 34, ?. (The Wandering Diacrisia.) 



Syn. pteridis Henry Edwards; bicolor Walker; rufula Boisduval; 

 punctata Packard ; proba Henry Edwards. 



The insect illustrates the phenomenon of sexual dimor- 

 phism, the males and females being unlike in color. The 

 species-makers have had some sport with it, as shown by the 

 synonyms. 



Genus HYPHORAIA Hubner 



This is a sub-arctic genus, circumpolar in its distribution 

 in the Northern Hemisphere. Three species occur in our terri- 

 tory, one of which we figure. 



( I ) Hyphoraia parthenos Harris, Plate XVI. Fig. 20, $ . 

 (The St. Lawrence Tiger-moth.) 



Syn. boreaiis Moeschler. 



The moth, which is one of the most beautiful in the 

 family, is comparatively rare in collections. It occurs in 

 northern New England, and the valley of the St. Lawrence, 

 westward to Manitoba. It is occasionally found in the Catskills. 



Genus PLATYPREPIA Dyar 



One species is found in our region. It is somewhat variable 

 in the style and number of the spots upon the wings. 



(i) Platyprepia virginalis Boisduval. Plate XV, Fig. 18, 

 $ . Fig. 19. ? . (The Ranchman's Tiger-moth.) 



Syn. ochracea Stretch; guttata Boisduval. 



A very beautiful insect, quite common in Colorado. 

 Wyoming, and Montana, and thence ranging westward to 

 northern California and the region of Puget's Sound. 



128 



