352 Lepidopterologioal Contributions. 



this species is much larger, and is readily distinguished by the 

 obscure color of the upper surface, and the detailed differences 

 in the appearance of the metallic lines. The external margin 

 of the primaries is straighter, less roundedly exserted than in 

 N. pumila, with the angles more prominent. Owing to the 

 obscure color of the upper surface of the wings in N. borealis, 

 the contrast between the coloring of the upper and under sur- 

 faces is much more striking than in N. pumila. 



Taken on the 5th of July, 1864, by Mr. Grote, near Upper 

 Coldenham, Orange co., N. Y., about nine miles west of New- 

 burgh, on the Hudson. Several (eight or ten) specimens were 

 taken in the midst of a wood, while flitting over a mound free 

 from undergrowth and exposed to the rays of the sun. These 

 specimens have been partially distributed among collections in 

 Canada (Saunders) and Massachusetts (Treat), under the name 

 of N. pumila ; but, since a number of Southern specimens 

 have been received, a comparison of those remaining in our 

 possession shows the specific distinctness of our northern spe- 

 cies. So far as known to us this is the most northern habitat 

 yet given for the genus, and it is worthy of note, that the spe- 

 cies so found exceeds its southern associate in expanse ; our 

 specimens of 1ST. pumila, from Georgia, expanding 0.75 to 0.90 

 inches, while, generally, they exhibit the proportions of a 

 smaller insect. As is the case with N. pumila, there appear to 

 be no differences of coloration between the sexes in N.borealis. 



Compared with the figure of "Nymphidium Jessa," Boisd. 

 Sp. Gen. Lep., Plate 6 (2 B.), fig. 10, our species differs by its 

 more ferruginous color, the greater continuity of the transverse 

 black lines, the sinuosity of the inner metallic line, and by the 

 presence of the black interspacial dots, placed between the 

 two exterior metallic lines, as in N. pumila. In Boisduval's 

 figure, above cited, these lines are very propinquitons, even, 

 and the narrow space inclosed by them is bright brownish 

 orange, without any dots, while the inner metallic line is pre- 

 ceded, on both wings, by dark and large interspacial dashes, 

 entirely wanting in either N. pumila or N. borealis. 



