4 MESSRS. ROBINSON AND KLOSS ON 



publication is likely to full will luivo some slight knowledge of orni- 

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

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

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

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

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

 may occui- in widely separated localities between which other forms 

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

 and Malayan f(jrms, there are cases that appear to support this theory 

 but diligent examination will generally disclose points of difference, 

 even if extremely slight, which are generally constant. Similar 

 auonialies occur among certain bats and lemurs inhabiting islands on 

 opiX)site 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, ((uestioned the reality of others already described; but in all cases 

 we have given our arguments. 



It is hoped that the map accompanying this paper will prove 

 u.seful, while the following short description of some of the 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 Present Expedition: January 2S — 

 AjyTil 28, 1019. 



PULAU MOIIEA 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 west : 

 the eastern island lower and more flat. Both islands lieavily 

 timbered in places. Situated on a coral bank of small extent in 20- 

 25 fathoms, abcmt 20 miles off" the coast of Trang. Very dry, M'ith 

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



1. Journ. F. M. S. Mus. x, part 3, 1921, pp. 203-213. 



JOURN. NAT. HIST. SOC. SIAM. 



