162 MESSRS. ROBINSON AND KLOSS ON 



liead, in some cases almost uniform with the vertex, is evidently 

 connected with age : but whether it is a sign of youth or very 

 extreme age we are unable to say with certainty, though we incline 

 to the belief that very old birds hav^e a pure yellow forehend. 



The very large series in our possession makes it practically 

 certain that the sexes in this barbet, as suggested by- Salvadori and 

 Blanford, are widely different. We have no female whatever in 

 which any part of the tlu'oat is uniform red, or which possesses a, 

 clearly defined yellow or red frontal band. The blue beneath the 

 eyes is always paler and the yellow spot at the base of the bill much 

 reduced. Neither have any of them a marked blue throat-patch. 

 We possess but few juvenile males, but one bird, barely half grown, 

 has the red throat and the blue gular patch beneath it strongly 

 marked. 



The species is very much commoner in the southern parts of 



Peninsular Siam than it is in British Malaya. It has not, however, 



been recorded from S. W. Siam, Avhere possibly C. davisoni takes its 



place. Stuart Baker again erroneously records Herbert's Tung Song 



specimen as new to Peninsular Siam, whence it has been repeatedly 



obtained. 



Cyanops incog-nita (Hume). 



Megalaema incoynit'i, Hume, Stray Feathers, ii, 1874, pp. 442, 486 

 (25 miles north of Yea) ; A., p 501 (neighbourhood of Tavoy). 



Cijanops asiatica ? incoynita, M., p. 429 (Tung Soug, Peninsu- 

 lar (Siam). 



This species has been obtained so near the northern boundary 



of the area here dealt with that it is reasonable to include it 



among birds which occur in the northern half of the Peninsula. Mr. 



Stuart Baker identifies specimens as this form with considerable 



doubt : they are stated to be young birds. 



260. Cyanops davisoni (Hume). 



Megalaema davisoni, Hume, Stray Feathers, v, 1877, }>. 108 

 (Centi'al Tenasserim) ; A., p. 151. 



Cyanops dai^isoni, C. ii, p. 184 ; Shelley, Cat. Birds Brit. Mus. xix, 

 1891, p. 65, pi. iv, tig. 1 ; H., p. 94 (Khao Nawng, Bandon, 

 3,500 ft.) ; G., pp. 137, 149 (Rajburi and Petchaburi). 



A. Hume, & Buvison, Stray Ffathers. vi, 1878. E. O. Gninl, Fasciculi Malayenscs. iii (Birds), 1905 



B. Miillor. nic < )niis (lor InselulanKU, 188-2. F. Kobiusoii and Kloss. T1>is, 1910-11. 



C. Oatrs, Birds Brit. Burmali, Vols. i. \- ii883. C fiairdncr, Journ. X. H. Soc. Siam, i, 1915. 



D. Bonhotc, r. Z. S. I'JOl, Vol. i. H. Kobinson, Journ. K. M. S. Musjeiuiis, v, 1915. 



JOURN. NAT. HIST. SOC. SIAM. 



