218 Mr. E. C. Stuart Baker on [Ibis, 



From tlie above table we see that this species falls into 

 two well-divided races — one with a wing averaging well over 

 80 mm., the other well under 80 mm. 



As regards the larger race, I can find no colour variation 

 by which it can be split up. At first sight Robinson's skins 

 do seem to be separable, because o£ their bright clean green 

 appearance, and the amount of yellow in the spot under the 

 eye. A careful examination, however, seems to show that 

 this is due only to the beautiful way in which the skins are 

 made. I find that skins made by one of my men in 

 Cachar are facsimiles in colour and size of Robinson's 

 C d. orientalis^ and this race cannot be maintained. The 

 amount of yellow in the spot under the eye varies to the 

 same degree in birds from Sikkim to south Burma and 

 peninsular Siam. 



In the smaller race a further division seems desirable. 

 Birds from Borneo and Sumatra are not separable from one 

 another, unless one considers a difierence of 2*5 mm. on an 

 average wing-measurement sufficient for this purpose. In 

 coloration both birds are identical, with black ear-coverts, 

 and a big black breast-patch. Parrot divides his horneensis 

 from typical duvauceli as being a brighter, paler green, 

 but the alleged difference is certainly not visible in the 

 two series in the British Museum. 



When, however, we come to the Malay Peninsula bird, 

 we find that the ear-coverts are neither pure blue nor all 

 black, but are dull bluish with the basal half black, the pro- 

 portion of the two colours varying considerably. The black 

 spot on the breast seems to be nearly always present, but 

 is much smaller than in the Sumatran and Bornean birds. 



Accordingly there are, I consider, the following three 

 forms of this Barbet, with a possible fourth from Batu 

 Island : — 



( 1 ) Cyanops duvauceli duvauceli. 



Bucco duvauceli Less. Traite, 1831, p. 164 : Sumatra. 



Cyanops duvauceli borneensis Parrot, Milnchen. Abh. Ak. 

 Wiss., Math.-Phys. KI. xxiv. 1907, pp. 149, 286 : Borneo. 



