48 LEPIDOPTERA OF NORTH AMERICA. 



crossed near its base by a short black bar. The emarginations of 

 the wings are margined with white. 



Body black ; thorax thickly covered with brownish fulvous hairs. 



The above described butterfly so nearly resembles the Argynnis 

 idalia, that at first sight it may easily be taken for a mere 

 variety. The want of a double row of white spots on the upper 

 surface of the lower wings, although a remarkable difference, would 

 not perhaps constitute a specific mark ; yet, when we come to 

 examine the under surface, instead of the twenty-four or twenty- 

 five spots of white, which are observed over its whole surface, we 

 find but two near the margin, and six large ones occupying nearly 

 the whole of the base, and radiating from the axilla, we cannot 

 hesitate to pronounce it distinct and certainly new. 



The larva is unknown. The interesting fact of so large a species 

 of butterfly being found at this time in New Jersey, and having 

 heretofore escaped the researches of all entomologists, has led me 

 to offer this short communication for publication in the Proceed- 

 ings. It was found by me in July of this summer, on Succasunna 



Plains, near Schooley's Mountain, in Morris County. 



FISHER. 



Most probably a variety of A. i Julia. (Morris.) 



12. A. ossianus Herbst. Boisd. et Lee. p. 157. Figured in Boisd. Icon. 



Hist. pi. 19. Herbst. pi. 270. A. trichlaris Hiibn. 



Small ;' upper side fulvous, inclining to yellowish. 



Under side of the primaries deeper fulvous; summit washed with 

 ferruginous ; the lunules of the extremity are scarcely indicated. 



Under side of secondaries reddish ; all the spots are nacred, 

 except the transverse ray, which precedes the ocellated ones ; mar- 

 ginal lunules small, not very triangular, bordered by a brown arc. 



The nacred spots of the under side of the female are more dull 

 and smaller than in the male, and the transverse black points of 

 the primaries are nearly all pupilled. 



Labrador. 



13. A. polaris Boisd. Boisd. et Lee. p. 159. Figured in Boisd. Icon. Hist. 



pi. 20. 



Size of A. myrina. Primaries have nearly the same design as 

 A.frigga, of Europe. The base is less obscure, and the points 

 which precede the terminal edge are smaller. 



Under side of secondaries ferruginous brown. The base is 



