350 MESSRS. ROBINSON AND KLOSS ON 



503. Oriolus chinensis tenuirostris Blyth. 



Oriolus tenuirostris, Blyth, Journ. Asiat. Soc. Bengal, xv, 1846, p. 48 



(Burma) ; A., p. 329 (Malewoon) ; 0. i, p. 213 (Malewoon). 

 Oi'iohis indicus tenuirostris, M., p. 208 (Patiyu). 



Not recorded from south of the Isthmus of Kra. 



504. Oriolus xanthornus (Linn.). 



Coracias xanthornus, Linn., Syst. Nat. i, 1758, p. 108 (Bengal). 

 Sturnus luteolus, Linn., Syst. Nat. i, 1758, p. 167 (Bengal). 

 Oriolus melanocephcdus, Linn., Sy.st. Nat. i, 1766, p. 160 (Bengal) ; 



A., p. 330 (Tavoy to Mergui) ; B., p. 40 (Junk Seylon) ; C.i, p. 



214 (Mergui northwards); F., p. 72 (L'ingkawi) ; G., p. 149 



(Ratburi or Petchabmn) : I., p. 23 (Koh Lak) : J., p. 187 (Trang); 



L., p. 116 (Ghirbi). 

 Oriolus melanocephalus himalai/anus , K., p. 225 (Koh Lak). 

 Oriolus luteohis thaiacous, Hartert, Bull. Brit. Orn. Club, xxxviii, 



1918, p. 63 (Koh Lak) ; M., p. 209 (Patiyu). 



4 d , a , $ imm. Koh Lak, S. W. Siam, 2-9 April ] 919 [Nos. 

 4929, 5029, 5180, 5188, 5201]. 



5 . Hat Sanuk, near Koh Lak, 17 April 1919 [No. 5356]. 



" Iris red ; bill pale pinkish horn ; feet grey or greenish lead". 



Total length S , 223, 237, 233, 245, 235 ; $ , 227 ; wing d , 

 133, 133, 130, 136, 142 ; $ , 131 ; tail d , 90, 86, 87, 92, 90 ; 2 , 85 : 

 tarsus c? , 26, 24, 23, 25.5, 23.5 ; $ , 22 ; bill from gape S , 33, 32, 33, 

 34, 34 ; $ , 30 mm. 



Hartert has separated birds from Koh Lak, S. W. Siam to 

 Kompongthom, Cambodia, from the Indian form under the name of 

 0. I. thaiacous, and examples which we have from the former place 

 agree with his diagnosis. 



On the other hand, birds from Trang and South Aunam do 

 not appear to differ from the true xanthornus (vide our remarks in 

 Ibis, 1919, p. 614), so that if thaiacous is a valid race it places the 

 other in three isolated areas of distribution. For the present, how- 

 ever, we leave all our synonomy under the specific name, though it 

 is by no means unusual that birds of the southern half of the Malay 

 Peninsula and of Cochin-Chiua are the same, while those of Siam 

 differ and separate them geographically. 



A. Hume ilc Davison, Stray Feathers, vi, 1878. E. O. C4rant. Fasciculi Malayensea, iii (Birds). 1005. 



B. Miiller, Die Ornisderln.scl Salanjjra. 188-2. F. Kobinson and Kloss, Ibis, 1910-11. 



C. dates, Birds Brit. IJiu-mali, Vols. i. & ii, 1883. G. tiairdner, .Journ. N. H. Soc. Siam, i, IQl.""). 



D. Bonliote, I". Z.S. 1901, Vol. i. H. Kobinson. Journ. F. M. S. Museums, v, 1915. 



JOURN. NAT. HIST. SOC. SIAM. 



