32 MR. E. C. STUART BAKER ON 



and Burmese birds into geographical races, and the Siam birds differ 

 in no way from the Burmese. 



Some Ornithologists still ignore the possibility of parallel 

 conditions in different areas resulting in the same form of evolution, 

 but the majority now accept this, and the old theory of the impos- 

 sibility of interrupted areas containing the same sub-species is being 

 gradually discarded. In India, Burma, Siam and the Malay 

 Peninsula we have a horse-shoe shaped area in which we constantly 

 find similar, if not quite the same, order of evolution proceeding as 

 we work south down the two arms. 



Thus we often find the Ceylon birds more nearly approximate 

 their representatives in the Malay Peninsula than cither of them do 

 their parent race in the extreme north. 



The name Carpophaga is preoccupied, and the above generic 

 name takes its place. 



t 245. COLUMBA LIVIA INTERMEDIA. 

 Columba intermedia, Strick., Ann. and Mag. N. EL, xiii, p. 39(1844). 

 9 Pak Jong, E. Siam, 17.8.15. 

 A typical intermedia with dark grey lower back. 

 -f 246. Chalcophaps indica indica. 



Columba indica, Linn., Syst. Nat. i, p. 284 (1766) . 

 6 9 juv. Klong Wang Hip, P. Siam, 6-9.10.15. 

 2 Krabin, P. Siam, 13.11.15. 

 9 Klong Bang Lai, P. Siam, 24.1.16. 



-f 247. Streptopelia suratensis tigrina. 



Columba tigrina, Temm. and Knip., Pig. i, pi. 43 (1910-11). 



2 6 2 9 Samkok, C. Siam, 20-22.6.15. 

 o Klong Wang Hip P. Siam, 5.10.15. 

 All these specimens are typical tigrina. 



>- 248. (Exopopelia traxquebarica htjmilis. 

 Columba humilis, Temm. PI. Col. 259 (1824). 

 6 2 Samkok, C. Siam, 30.8.15. 

 6 9 Krabin, C. Siam, 10.11.15. 



4-249. Geopelia striata striata. 

 Columba striata, Linn. Sys. Nat. i, p. 282 (1766). 



3 1 Klong Wang Hip, P. Siam, 30.9.15 to 9.10.15. 



JOUllN. NAT. HIST. SOC. SIAM. 



