THE BIRDS OF NORTHERN THAILAND 325 



CHLOROPSIS COCHINCHINENSIS COCHINCHINENSIS (Gmelin) 



Indo-Chinese Golden-hooded Leafbird 



[Turdus] cochinchinensis Gmelin, Systema naturae, vol. 1, pt. 2, 1789, p. 825 



(Cochin-China). 

 Chloropsis chlorocephala, Gyldenstolpe, Journ. Nat. Hist. Soc. Siarn, 1915, p. 166 



(listed); Kungl. Svenska Vet.-Akad. Handl., 1916, p. 65 (Pha Kho, Tha 



Chomphu, Khun Tan). 

 Chloropsis chlorocephala chlorocephala [partim], Gyldenstolpe, Ibis, 1920, p. 490 



("Throughout the whole country" [partim]). 

 Chloropsis icterooephala chlorocephala, de Schauensee, Proc. Acad. Nat. Sci. 



Philadelphia, 1928, p. 567 (Doi Suthep) ; 1929, p. 537 (Doi Suthep, Chiang 



Saen). 

 Chloropsis cochinchinensis cochinchinensis, Deignan, Journ. Siam Soc. Nat. Hist. 



Suppl., 1931, p. 139 (Doi Suthep). — Chasen and Boden Kloss, Journ. Siarn 



Soc. Nat. Hist. Suppl., 1932, p. 242 (Doi Suthep).— Deignan, Journ. Siam Soc. 



Nat. Hist. Suppl., 1936, p. 108 (Doi Suthep). 

 Chloropsis cochinchinensis cochinchinensis [partim], de Schauensee, Proc. Acad. 



Nat. Sci. Philadelphia, 1934, p. 200 (Doi Suthep, Khun Tan, Doi Chiang Dao, 



"Foot of Chieng Dao" ) .—Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 370 (Khun 



Tan, Mae Hong Son, Mae Sariang). 



The golden-hooded chloropsis is restricted to evergreen forest at low 

 elevations, occurring in this type of growth from the plains to 3,500 

 feet, throughout the northern provinces. In such a neighborhood as 

 that of Chiang Mai it is necessarily found only on Doi Suthep between 

 2,500 and 3,500 feet (casually as high as 4,600 feet). 



The ranges of our species of Chloropsis illustrate in a beautiful way 

 the division of territory between closely related forms of precisely 

 similar habits. The two species that dwell at low altitudes keep to 

 wholly independent plant associations ; auAfrons is restrained, in its 

 ascent of the hills, by the upper limit of the deciduous forest ; cochin- 

 chinensis, which theoretically could thrive at elevations in excess of 

 3,500 feet, by competition with the montane hardwickii. The relative 

 abundance of the three, from one locality to the next, varies directly 

 with the extents of the essential types of forest within given altitu- 

 dinal limits. 



An example of January 3 is in prenuptial molt; others taken be- 

 tween August 25 and September 7 are in postnuptial molt. 



Gyldenstolpe's specimens had the irides dark brown; the bill black; 

 the feet and toes plumbeous. 



The old male has the forehead and a short supercilium clear yellow, 

 changing gradually to the bright green (suffused with golden on the 

 nape) of the remaining upperparts; the wings deep green, with the 

 shoulder patch shining turquoise blue and the outer webs of the pri- 

 maries verditer blue; the central pair of rectrices deep green, the 

 others largely verditer blue; a short mustachial streak ultramarine; 

 the lores, the area between the eye and the mustache and the entire 



