DTJEING THE EECENT AECTIC EXPEDITION. Ill 



Euph'osyne and A. Selene, which we know, from habits, &c., to 

 be perfectly distinct ; yet each of these has modified forms in 

 northern and alpine districts. 



Chetsophanus phl(eas, Linni, var. Feildeni. 



Differs from typical phlosas (and also from americaiius) in the 

 brilliant copper-colour of the upperside of the anterior wings 

 being much less fiery and more subdued, and with brassy reflec- 

 ^tion (especially in the (S), so that the colour might almost be 

 termed brassy rather than coppery ; the spots normal in number 

 and position, but smaller ; the dark border is narrow and silky 

 greyish black with grey fringe, the dark costal margin scarcely 

 indicated : in the posterior wings the ground is of the same silky 

 greyish black as in the border of the anterior, the pale submar- 

 ginal band pale orange, with occasionally the faintest indications 

 of bluish spots above it. Beneath, the anterior wings are grey- 

 ish orange (with the ordinary spots), the border and the pos- 

 terior wings pale cinereous ; on the latter wings the dark dots 

 are very faintly indicated, and there is also only the faintest in- 

 dication of the red submarginal band. Expanse 28-29 millims. 



Three examples (2 6,1 $) from lat. 81° 45' {Feilden). 



I was at first inclined to place this very distinct variety as a 

 form of americanus ; but the posterior wings are more tailed than 

 in any examples I have seen of that species, though scarcely so 

 much so as in ordinary pliloeas. The common origin of both spe- 

 cies can scarcely be doubted. No species of Bumex was found in 

 these high latitudes ; but Oxyria reniformis occurred at all the 

 stations, and in all probability serves as the food-plant. 



Scudder has recently (Bulletin Buffalo Soc. Nat. Sciences, 

 vol. ii. No. 3) broken up Chrysoplianus into a multitude of genera in 

 a manner that appears to me likely to add to the perplexity of the 

 student rather than to be of any assistance : pliloeas and mnericanus, 

 according to his system, fall into the genus Heodes (Dalmau) . 



The other Arctic species {C. Boreas, Kirby) differs greatly, and 

 belongs to another group. 



Ltc-exa Aquilo, JBoisduval. 



One 2 froni lat. 81° 45' (Feilden). A known Arctic species, 

 extending from Newfoundland northward. Described by Curtis 

 (in Boss's voyage) as Polyommatus Franldinii. Scudder places 

 it and allied species in the genus Agriades (Iliibner). 



