THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 191 



We think, then, that in face of these figures it must be con 

 tended that the birds of the species inhabiting the area north of 

 about 10° N. are larger birds, and that birds of high elevations are 

 also larger. 



As regards colour : 



(a) Two out of the four northern birds available for examina- 

 tion have the yellow crest unbarred. 



Two out o£ twenty of the southern birds have the yellow 

 crest unbarred. 



(b) Interscapulium strongly barred in three out of four north- 

 ern birds. Interscapulium uniform or slightly spotted in fourteen 

 out of twenty one southern birds ; barred more or less strongly in 

 the remaining seven. 



This difference is also noted by Hume and Davison, op. cit. 

 supra. 



Northern birds have generally the pale interspaces on the 

 undersurface broader and paler than in southern birds, but the 

 character cannot be fully relied on as some southern birds have it. 

 We think, therefore, that G. ini. perlibtuus can fairly be maintained as 

 a northern local race which, however, is not found south of about 

 10°. 30', as Chumporn and Pakchan birds are, on the whole, to be 

 referred to G. m. vialaecensls. 



[A pair from Bangtaphan, S. W. Siam, lent by Mr. Williamson 

 are also G. m. perUitus. Wings, 135, 136 ; bill from gape 32, 30 mm. 

 Interscapuliam strongly barred ; one with yellow crest unbarred, one 

 barred; underparts with pale bars broad]. 



285. Chrysophlegma mentale humii Hargitt. 



Gallolophics inentcdis (nee. Temm.), A., p. 138 (Bankasoon) ; 0. ii, 



p. 46. 

 Ghrvsophlegma humii, Hargitt, Ibis, 1889, p. 231 {6, Malacca; 



$", Klang) ; E., p. 100 (Pataoi) ; F., p. 46 (Trang) ; H., p. 95 



(Bandon), M., p. 423 (Tung Song). 



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



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



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



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



U. Robinson and Kloss, Journ. N. H. Soc. Siam, M. !• Baker, Journ. N. H. Soc. Siam, iv, 1920. 



iii. 1919. (third part). 



VOL. V, NO. 2, 1922. 



