THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 27 



A great deal of confusion has arisen over the races of the 

 Thick-billed Green Pigeon. It appears to be borne out by the state- 

 ments of all writers that the continental race southwards, to the 

 northern third of the Malay Peninsula, is consistently larger than 

 birds from the southern two-thirds of the Malay Peninsula, Sumatra, 

 Borneo and Bangka. Palawan and Sulu birds are also stated to be 

 larger. 



Every area has its name, viz : — 



Treron curvirostra Gm. ... 1788. Malay Peninsula, f^i^rrr 



typica designated by Ober- 

 holser, 1912. Now restricted 

 to Selangor. 



Treron nipalensis Hodgson ... 1836. Nepal, etc, 



Treron griseicauda Gray ... 1856. Java. 



Treron nasicci Schleg. ...1863. Borneo and Sumatra (?) 



Treron harterfi Parrot ... 1907. N. E. Sumatra. 



There are also other races from the Barussan Islands. 



No one will probably dispute that the bird figured by Latham 

 (Gen. Syn. Birds, ii, 1788, p. 632, pi. 59 : and latinized by Gmelin as 

 Columba curvirostra, Syst. Nat. i, 1788, p. 777) represents the first 

 description of the species, though attached to a wrong locality (Tanna, 

 New Hebrides). Unless we are prepared to recognize the mere 

 references by Raffles and Vigors of Sumatran birds to Columba 

 curvirostra (Gm.), as a fixation of the type locality, we are bound to 

 admit T. c. harterti as the name for the Sumatran bird (if distinct 

 from the Bornean and Javanese) ;* T. c. nasica\ for the Bornean ; 

 T. c. curvirostra for the Malayan ; and T. c. griseicauda for the Javan- 



*Sch]egel (Ned. Tijd. Dierk, i, 1864, pp. 67, 8) records both grisei- 

 cauda and nasica from Sumatra. 



fSome authorities, however, including Wallace, claim that T. nasica 

 is a distinct species, occurring together with T. curvii'ostra and differing 

 mainly in the colour of the soft parts. 



I. Gyldenstolpe, Kunsl. Sv. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



56, No. 2, 1916. (first part). 



J. Robinson, .Journ. F. M. S. Mus. vii, 1917. Baker, Journ. N.H. Soc. Siam, iii, 1919. 



Ki Kloss, Ibis, 1918. (second part). 



L. .Robinson and Kloss, Journ. N.H. Soc. Siam, M. I. Baker, Journ. N.H. Soc. Siam, iv, 19-20. 



iii, 1919. (third part) 



VOL. V, NO. 1, 1921. 



