110 [June 



Thorax stout, pilose. Prothorax gaily colored. Patagia nut very dis- 

 tinct. Primaries broader than usual, triangular; breadth more than 

 one-half as great as their length. Costa convex throughout, especially 

 towards the apex, which is subrectangular, hardly obtuse : outer mar- 

 gin oblique, nearly straight; inner angle distinct. The nervules are 

 wider apart, and the median nervules are bent downwards towards the 

 internal angle more than usual. 



Secondaries broad triangular, reaching beyond the abdomen in both 

 sexes farther than usual. Costa long, hardly convex ; apex a little pro- 

 duced, rounded ; outer margins hardly convex, parallel with the costa. 



Legs moderately stout. Abdomen rather slender, in % tapering 

 gradually to a slight anal tuft. 



Though the Californian P. modesfa is so much smaller than the 

 two other species that we would suspect naturally they were generi- 

 cally distinct, there is nothing of sufficient importance to separate the 

 three species which approach closely the genus Epicallia. 



In none of the species ai"e the primaries crossed by gaily colored 

 bands, but there is generally present a bright costal patch, while the 

 hind wings are crossed beyond the middle, by a yellowish band. 



Platarctia parthenos. 



Arctia parthenos Harr., in Agassiz, Lake Superior, j). 390, vii. fig. 4. (1850). 

 Walk., Cat. Lep. B. M. III. p. 608. (1855). 

 Clem., Proc. Acad. Nat. Sc. Phil. p. 529. (Nov. 1860). 

 Morris, Synopsis Lap. N. Amer. Appendix, p. 337. (1860.) 

 Saunders, Synopsis Can. Arctiadse, p. 4. (1863). 



Soft brown and orange yellow. Head rubicund between the antennae. 

 Base of the pronotal pieces yellowish white. Primaries with four yel- 

 lowish white costal spots, 3rd largest and followed below by the discal 

 dot, and another larger spot on the inner margin ; 4th costal spot suc- 

 ceeded by two spots, the lower on the internal angle. A long fascia 

 nearly parallel to, and lying just under the base of the m. nervure. 



Secondaries; blackish with a median band of approximate large 

 orange spots of which the costal one is double. Within this last spot, 

 the costa is orange, widening at the base. Thorax reddish beneath ; 

 femora beneath rubicund, near the tips ringed with vermillion, while 

 the legs generally are black. Base of the abdomen reddish, below and 

 on the sides rubicund. Beneath paler; costa and nervules red; most 



