4 MESSRS. ROBINSON AND KLOSS ON 



publication is likely to fall will have some slight knowledge of orni- 

 thology. We have as far as possible made use of trinomials tln-ough- 

 out. In those eases in which binomials appear, it is not because we 

 are assured that a species does not vary, but merely because we are not 

 in a position to decide whether such is, or is not, the case. Nor are 

 we yet prepare! to subscribe to the theory that identical subspecies 

 may occur in widely separated localities between which other forms 

 occur. It is true that, especially in the case of certain South Indian 

 and Malayan forms, there are cases that appear to support this theory 

 but diligent examination will generally disclose points of difference, 

 even if extremely sliglit, which are generally constant. Similar 

 anomalies occur among certain bats and lemurs inhabiting islands on 

 opposite sides of the Malay Peninsula. 



We have been conservative in the matter of genera and have 

 not adopted several recent emendations, though we confess we have 

 no logical defence for not doinof it. 



We have described elsewhere i, on admittedly slight grounds, 

 certain new forms that have occurred to us in the writing of thie 

 paper and have, as it may appear to some people, possibly unreason- 

 ably, que.stioned the reality of others already described; but in all cases 

 Ave have given our arguments. 



It is hoped that the map accompanying this paper will prove 

 useful, while the following short description of some of tlie principal 

 collecting stations, as visited by us, may prove of interest (see also 

 Journ. Fed. Malay States Mus. x, Part 2, 1920, pp. 66-80). 



Places visited on the Pre^ient Exiieditimi : January !28 — 

 A}}ril 28, 1919. 



PULAU MOHEA OR PULAU TUPAI. 



A twin island with a shallow and narrow dividing strait. 

 The western island rocky and with till clitfs to the south and we.st : 

 the eastern island lower and more fli\t. Both islands lieavily 

 timl)ered in places. Situated on a coral bank of small extent in 20- 

 25 fathoms, about 20 miles off the coa.st of Trang. Very dry, with 

 water-cour.ses dried up at the time of our visit, though there is said to 



1. Journ. F. M. S. Mus. x, part .^, 1921, pp. 203-213. 



JOURX. NAT. HIST. SOC. SIAM. 



