12 1 
Derivation of the Avifauna <?/Narcondam and Barren Island. 
Species introduced 
Possibly 
Certainly 
Probably 
Volunt. 
In- 
volunt. 
Volunt. 
In- 
volunt. 
Volunt. 
In- 
volunt. 
From India or Indo-China 
7 
4 
5 
,, Andamans or Malaya 
9 
5 
. 
7 
By N.-E. Monsoon 
4 
I 
2 
,, S.-W. Monsoon 
7 
2 
4 
Total ... 
12 
6 
The butterflies must all of necessity be examples of involuntary 
immigration, and though not of necessity all immigrants under the in¬ 
fluence of winds, have probably in most cases been driven thither by 
one or other of the monsoons. 
Leaving out of account those of Barren Island, two of which have not 
been specifically identified while a third has not had the particular local 
race determined, and considering only those of Narcondam, we see that 
one —Leptosia xiphia —has of necessity come from the north-east, and one 
Ixias andama?ia —has of necessity come from the south-west; all the 
others may have arrived under the influence of either monsoon. 
Meagre as our knowledge of the Fauna of these islands is, we 
seem justified in concluding that the predominance of an Andamans 
element in it is altogether due to the fact that they are nearer the 
Andaman Group, from the direction of which a strong monsoon blows 
for the greater part of each year. At the same time it is clear that 
the opposite monsoon, though blowing with less force and over a 
wider sea, is not altogether inactive, but on the contrary must be held 
accountable for the introduction of certain species which, though they 
have reached these islands from Indo-China, have not yet succeeded in 
passing beyond them to the Andaman Group proper. The precise ex¬ 
tent of either influence it would however be premature, in the present 
state of our knowledge, to attempt to assess. 
From the Annals of Botany, vol VI, No. 22, July 1892. 
214 
On the Synonymy of Anthocoma flavescens Zoll.—By D. Train. 
A Labiate genus, Anthocoma, was proposed by Zollinger in 
247 
