19'^-] recently collected in Siam. 103 



(There is a considerable range in the length of the culmen, 

 which may be due to different methods of measurement. It 

 is a dimension about which some confusion probably exists : 

 a measurement used by Tweeddale, viz. length of bill from 

 nostril, was much more definite, but being taken on a 

 reduced length had the disadvantage of making diflferences 

 in size appear less obvious. The length of bill from gape 

 seems to be best, as being that least capable of two inter- 

 pretations and at the same time the greatest measurement 

 that can be taken.) 



The type from the extreme south of French Indo-China 

 seems to have been an immature bird, as it is of practically 

 the same size as the obviously subadult individual from 

 Lat Bua Kao_, which had, further, a very worn tail. The 

 specimens from northern Cambodia and Laos are larger than 

 the others, and it may be that there is a general increase in 

 size in that direction. 



~^ 51. Gecinus vittatus eisenhoferi (Gyldenstolpe). 



Picus vittatus eisenhoferi Gyldenstolpe, Ornith. Monatsber. 

 xxiv. 1916, p. 28 ; id. Kungl. Sv. Vet.-Akad. Handl. Ivi. 

 No. 2, 1916, p. 88. 



Gecinus vittatus Robinson, Ibis, 1915, p. 738. 



1 S • Lat Bua Kao. 



1 S . Koh Mesan off Cape Liant, S.E. Siam. Nov. 

 1916. 



Iris brown or crimson ; maxilla black or plumbeous- 

 black ; mandible olive or greenish-yellow, tip black; feet 

 olive. 



T. L. 296, 320; W. 140, 137 ; B. f. g. 38, 39. 



The type, a female and only specimen obtained, was 

 described as having the upper parts " bright grass-green 

 instead of yellowish-olive ; the rump-feathers fiercely tipped 

 with yellow," and was perhaps an abnormally bright indi- 

 vidual, for my examples confirm the character of greater 

 size only (wing 142). It is interesting to note the 

 increase in this respect as the species proceeds north- 

 wards : — 



