440 
Mr. J. J. Walker on 
but more arid and of less elevation ; it includes some 
excellent little bits of collecting ground, the best of 
wbicli, however, was unfortunately destroyed just as I 
was leaving for England. 
Of the 125 species of butterflies hereafter enumerated, 
114} have been taken or personally observed by myself, 
the remainder having been either detected by myself in 
local collections (of which I have examined several at 
Hong-Kong), or else existing in the chief collections at 
home, with the Hong-Kong locality attached. Three 
species {Amathuda jphidi'pjpus j Argynnis childreni, and 
Papilio xuthus) are inserted with much doubt, no 
specimens of these, so far as I am aware, being extant 
in any collection from Hong-Kong, though they are all 
supposed to have been seen by observers who were 
familiar with the insects. A few obscure Hesperiic/se are 
still unnamed, and one or two of these may belong to 
new or undescribed species, but I have not ventured to 
describe them. 
The accompanying table of geographical distribution 
will serve to show the general relations of the Hong- 
Kong butterflies with those of the surrounding regions. 
The essentially tropical character of the entire butterfly- 
fauna of the island, like that of its flora, will be evident 
from the fact that only three species (Danais chrysippus, 
Vanessa carduij and Lycsena hoetica), all of very exten- 
sive or almost world-wide distribution, are common to 
Hong-Kong and Europe, while only twenty-seven 
species, less than one-fourth of the whole number, extend 
to North China, Japan and the Amur region. The large 
percentage of species common to Hong-Kong and the 
Himalayas is very remarkable, but is probably in part 
due to the extreme richness in tropical forms of the 
latter region. The number of species common to Hong- 
Kong and the Philippine Islands, which are separated 
by at least 450 miles of deep sea, is even greater than 
those occurring in the not very distant sub-tropical 
regions of Central and Western China, between which 
and Hong-Kong are no very formidable physical barriers, 
though these two regions belong to two diSerent river- 
systems. So far as 1 am aware, only three species 
{Euploea superha. Chrome eumeus, and Gerydus chinen- 
sis) appear to be peculiar to Hong-Kong and the 
adjacent parts of south-east China, while the last- 
