has Hu;ht patches inside this border, the other has none; beneath im- 

 maculate, densely dusted; the discal spots small, one in rosy edging, 

 the other in red-brown. 



At this present writing I have also before me four yellow females, 

 and six white ones, of Captain Geddes' collecting, but belonging to 

 Mr. Neumoegen. Of these yellow ones, none are uniform in color, 

 like the type; No. i has a flush of orange; 2 and 3, more orange; 4 

 decided orange on both disks. One has traces of sub-marginal series 

 of spots, to wit, a few scales in three lower interspaces on fore wings; 

 otherwise all are immaculate; all are thickly dusted; and the borders 

 of upper side vary from a few scales at apex and along margin to a 

 well defined broad border, with interior light patches; discal spots just 

 as before described. 



Of the six white females, two have slight borders, mere traces of the 

 inner and outer edges of a border; one has the half of border on mar- 

 gin distinct; the other three have full width borders, with interior 

 whitish spots; one of these has also a border to hind wings, made up 

 of separated patches lying at the ends of the nervules. No other 

 female, white or yellow, has shown a border to hind wing. Beneath, 

 all are heavily dusted; one has two little clusters of scales on fore wings 

 on lower two interspaces, otherwise all are immaculate; the discal spots 

 of all small, white, in either roseate or red-brown edging. 



After seeing this material from localities widely separated, from Mon- 

 tana, and British America as far north as Lat. 60°, I am of the opin- 

 ion that all the examples are members of one species, to wit, Christina. 

 The type male has deep orange disks. Astma is a well marked form 

 or variety; the disks orange-ochraceous, and one style of color grades 

 into the other. One of the Montana examples approached Christina 

 in coloring, but the usual Montana type appears to be not orange, but 

 ochraceous. All the males from the far North were deep orange. So 

 also were most of the males taken by Captain Geddes (about Lat. 

 50°, along Can. Pac. R. R. j, but a few showed a change towards the 

 Astrcea type. It is probable that in Lat. 60° thore is but a single 

 brood of the butterfly, and if that is the case, Christina is the winter 

 form. If in Montana there are two broods, Astra-a may be the second 

 brood, the species being seasonally dimorphic. But it seems to me 

 more probable that the case is like that of Satyrus Nephele, there being 

 a Northern form and a Southern forrii, and between the areas occupied 

 by the two, a belt of dimorphism. Nephele passes into this belt, and 

 on the other side of it emerges Alope (or the reverse takes place), as 

 I have clearly shown in But. N. A., Vol. 11. So Christina may rep- 

 resent its species in the far North, Astra-a in the Southern area, while 

 between the two is a belt in which both are found. The species passing 

 through this belt loses one form and emerges under the other. The 

 case of Occidentalis and Chrysomelas is perhaps one of the same nature. 



