The Butterflies of Chile. 281 



also how chiliensis can be separated from the next 

 species, I have figured a male and female from the 

 east side of Lake Nahuelhuapi, the farthest point south 

 which I visited. These were flying on grassy pampas 

 where the rainfall is very much less than in Chile and 

 the snowfall and cold of winter much greater, and thei^ 

 markings show a good deal more resemblance to those of 

 monticolens. It is possible that this form may prove 

 distinct from ehiliensis. 



20. Cosmosatyrtts monticolens. (Plate XV, figs. 7 ^, 8 ^,) 

 Satyriis monticolens Butler, Trans. Ent. Soc. Lond., 

 1881, p. 484, PI. XXI, fig. 1. 



I first found this at the head of the Lolco Valley on the 

 road to Lonquimay^ at about 5000 feet, and was at once 

 certain from its flight that it was a species new to me. 

 Instead of a slow short flight among bushes like that of 

 chiliensis, it has a rapid straight flight of 20 to 50 yards 

 backwards and forwards over wet subalpine meadows always 

 amongst grass and stones, and was in consequence much 

 harder to catch. It was afterwards found between the 

 Alumine Lake and Pulmari on similar ground at about 

 4500 feet, and also near San Martin on a mountain side at 

 GOOO feet. It varies considerably, and I have figured a 

 pair from Pulmari to show the differences between it and 

 chiliensis. These agree fairly well with Butler's type, 

 which came from the mountains above the Baths of 

 Chilian, where it had not yet appeared at the end of 

 December. 



Cosriiosatyi'us ivilliamsiamos. 



Arge williamsianus, Butler, Cat. Sat., p. 159, PI. IV, 



fig. 1 (18G8). 

 (Ends antarcticns, Mabille, Nouv. Arch. Mus. (3), i, 



p. 142, PI. X, figs. 5, 6. 



The type of williamsianus in the British Museum is a 

 female in bad condition from Port Famine, Patagonia, and 

 has been compared with the type of CEncis antarcticus, 

 which appears to be identical. I believe that it is very 

 nearly allied to, if not identical with, m.onticolcns ; the 

 shape of the wings and the white veins on the hind-wing 

 below being similar, and the difference not more than one 

 might expect in the species when starved and dwarfed by 

 an ungenial climate. 



