THE CANADIAN ENTOMOLOGIST. 23 



northern Atlantic species, not yet found in the United States, but extending 

 from Anticosti and Southern Labrador to Lake Winnipeg and the 

 Saskatchewan. 



4. N. Lvgdamtts ( Polyommatus Lygdamus Doubl. Entom.) I have 

 never seen the female of this species, but the wings of the male are pale 

 glistening pruinose blue above, with a narrow, distinct, black border . 

 beneath, the species is peculiar for the large size of the ocellated spots, the 

 clearness of the dark slate brown ground color little obscrred by any 

 dusting. It is a Southern Atlantic species, ranging through the sea-board 

 States of the Union from the valley of the upper Susquehanna to Georgia. 



5. N. Oro, nov. sp. This species has been referred in collections 

 to the preceding species, with which it is no doubt closely allied, but from 

 which it differs in several particulars. The upper surface of the wings of 

 the male" is almost entirely destitute of the pruinose bloom of N. Lygdatnus 

 and is of a much more delicate, tenderer blue, which permits all the 

 spots of the under surface to be seen upon the upper side, a peculiarity 

 shared with it by the following species only ; the dark border of the wings 

 is also narrower than in N. Lygdamus, but equally well defined 

 though not so dark ; the grayish white fringe of the hind wings is not in 

 the least interrupted by blackish at the nervure tips, as it always is in 

 N. Lygdamus. The upper surface of the wings of the female is mostly of 

 the same blue as in the male, through which the spots of the under sur 

 face of at least the hind wings may be seen ; the apical fifth or sixth of 

 the fore wings is brown, generally merging gradually into the blue and 

 never sharply defined from it : so the anterior portion of the hind wings 

 is of the same brown as far as the subcostal nervure and its middle band, 

 and a narrow line of brown follows the hind border ; the apex of the cell 

 is marked by a very narrow, sub-obsolete, transverse blackish bar. Be- 

 neath, the wings closely resemble those of the Californian N.Antiacis, but 

 the extra mesial series of spots on the hind wings is more uniform, the 

 distance between the second and third spots (from the costal border) 

 being less than usual in this genus. \ have only seen this species from 

 Colorado. 



6. N. Behrii (Lyaena Behrti Edw. ; Lycmna PolypJiemus Boisd.) 



The upper surface of the wings of the male is of a blue, scarcely 

 differing from that of N. Oro, but is not quite so delicate and is slightly 

 darker, with all the veins slightly hoarv and so more than usually distinct; 



