534 
MR. A. G. BUTLER ON THE BUTTERFLIES OF MALACCA. 
enough, is found both in Java and the Australian Region, whilst a dwarfed form of it is 
taken in the Philippines ; yet D. nerina , although more widely distributed than D. bolina , 
exhibits even less individual variation. 
The fact of two species of Terias , discovered in the New Hebrides, turning up in 
Malacca, is somewhat startling ; but it is quite possible, in a genus where only a prac- 
tised eye can at once detect the specific differences, that the same form of imago may 
have been simultaneously developed in both localities ; moreover, breeding might (as it 
often does) reveal constant and well-marked distinctive characters whereby the earlier 
stages could at once be separated. 
The following Note, which appears to me to be worthy of the consideration of natu- 
ralists, has been communicated by my friend Mr. W. L. Distant, who was for some years 
resident at Province Wellesley : — 
“ All catalogues of the Penang fauna must be accepted with some qualifications. The 
dependencies of Penang and Province Wellesley are usually made more or less into one 
zoological province, especially as regards the insects. This I found to be the case when 
collecting there a few years ago, all collections being then made indiscriminately from 
both localities. 
tc The island of Penang is about 20 miles long by 9 miles broad, comprising an area 
of about 107 square miles. A group of granite hills occupies about two thirds of its 
extent, running through its centre from north to south, bounded by a plain on their 
eastern and western sides. These hills are densely covered with a beautiful forest on all 
sides ; and their highest point, West Hill, is about 2600 feet above the sea. 
“Province Wellesley is situated on the Malayan peninsula, and is separated from 
Penang by a strait from 2 to 10 miles broad ; it is about 35 miles in length, averaging 
8 miles in width. Although it possesses many hills of a considerable elevation (yet not 
equalling those of the island of Penang), its general character is more of a plain, in which 
jungle tracts and cultivated lands of rice and sugar-cane are its characteristics. Man- 
grove swamps, often of great extent, exist in the neighbourhoods of its many creeks and 
rivers. 
“ There is little doubt that, when the floras and faunas of these two districts are 
worked out separately and distinctly, a common character will be found to pervade them 
both, but that many species will be found locally distinct and constant. Species may be 
expected to exist in the lofty wooded regions of Penang that are absent in the plains and 
less elevated hills of Province Wellesley. At present, however, when mixed collections 
are made from both regions, the habitat ‘ Penang ’ must be accepted as not representing 
the insular fauna alone, but comprising also that of a portion of the Malayan 
peninsula.” 
