(. Teya" #) 
occurring at great elevations in the Andes and Chili, has a 
striking resemblance to Synchloe Dutleri, a species which 
accompanies Baltia in Ladak. If similar conditions of envi- 
ronment do not produce similar effects, how can these extra- 
ordinary cases of resemblance in remote and disconnected 
areas be accounted for ? 
But the Chilian Satyrid@ are the most numerous and peculiar 
of these mountain forms. Of seventy-two species recorded by 
Butler from Chili, no less than thirty-two are Satyrid, 
including several endemic genera, which resemble if they are 
not congeneric with /pinephele, Frebia, and Hipparchia, of the 
northern region. 
Argyrophenga and Aryyrophorus are two genera of most 
striking coloration, on account of the metallic silvery colour 
of the upper surface, whose only near ally is the still more 
remarkable A. antipodum of New Zealand. 
Next I may notice some species of Aryynnis which, though 
of a type different to anything in the North Temperate region, 
as A. inca and A. cytheris, have not been generically separated, 
and four or five species of Colias, a genus which occurs from 
Kcuador to the Straits of Magellan. 
Of butterflies found on the eastern side of extra tropical 
South America, I know none of Northern type except Colias 
lesbia, and a species described as (nets antarcticus, Mab., 
which I have never seen. Muryades, however, is a genus 
of very remarkable structure, haying an extraordinary 
horny excrescence on the abdomen of the female, analogous 
to that found in Parnassius, in Luehdorfia from N. EK. Asia, 
and in Hurycles from Australia, These four genera are the 
only ones in which this appendage is observed, though there 
is something like it in Pareba. I showed in my paper on 
‘ Parnassius ’ * that this organ was developed during copula- 
tion, but its function still remains unknown. 
With regard to the butterflies of the Neotropical region I 
shall say nothing, as I know too little of them, and they are 
better left to those who haye made this region a special study. 
Mr. Salvin, the highest authority on the subject, does not 
see his way to subdividing it on the butterflies without going 
* Proc. Zool. Soc. 1886, p. 6, et seq. 
