BIRDS FROIVr SIAM AND THE MALAY PENINSULA 207 



the crown green, the red occipital spot and red forehead much reduced 

 in area, a black rictal stripe, and a narrow ring of yellow feathers 

 around the eye. It can be distinguished from the Cyanops oorti 

 forms by the green instead of yellow crown; bluish instead of yellow 

 throat; and a number of other characters. 



MEZOBUCCO DUVAUCELD CYANOTIS (Blyth) 



Bucco cyanotis Blyth, Journ. Asiat. Soc. Bengal, vol. 16, p. 465, 1847 (Arracan). 



Eight males and five females, Khun Tan, August 29-September 10, 

 1930; one male, Doi Nangka, November 17, 1930. 



Seven males from northern Siam measure: Wing, 81.5-85 (83.5); 

 tail, 44.5-49 (46.7); cuhnen, 17.5-19 (18) mm. Four females from 

 northern Siam: Wing, 80-82.5 (80.9); tail, 43-47 (44.9); culmen, 18- 

 18.5 (18.4) mm. 



The form ranges from Silvkim to Assam and south through Burma 

 to northern Tenasserim and northern Siam and eastward to Laos 

 and Tonkin. 



Count Gyldenstolpe ^^ recorded it between Bang Hue Hom and 

 Kao Pl3mg, northern Siam; de Schauensee^* from Doi Sutep, 3,000 

 feet, and Chengmai. Deign an ^^ says that it is rare on Doi Sutep 

 between 3,000 and 5,500 feet. Previously to Dr. Smith's taking 

 the form at Khun Tan, Count Gyldenstolpe had collected it at the 

 same locality. 



MEZOBUCCO DUVAUCELU ORIENTALIS Robinson 



Mesohucco duvaugli [sic] orientalis Robinson, Ibis, 1915, p. 738 (Ok Yam, Franco- 

 Siamese Boundary). 



One female, Sakeo, near Krabin, May 5, 1928; one female, Klong 

 Yai, Sriracha, July 24, 1932. 



These two specimens, along with a female from Ok Yam, the type 

 locaUty, and a male from Koh Chang, have larger bills and the red 

 rictal patch has broader yellow tips to the feathers than M. d. cyanotis. 



De Schauensee,®" with a larger series available for study (from Bua 

 Yai, Kon Ken, and Chantabun), has called attention to other differ- 

 ences, namely: The ear coverts are tinged with green and there is 

 a red band below the blue of the throat. In the series of northern 

 birds examined by me this band is sometimes present, however. There 

 appears to be Uttle difference in color or size between the sexes. 



One male from Koh Chang and three females from southeastern 

 Siam measure: Wing, 80-84.5 (82.4); tail, 41-46 (44.2); culmen, 

 20-21.5 (20.9) mm. 



•' Kungl. Svenska Vet.-Akad. Handl., vol. 50, no. 8, p 61, 1913. 

 " Proc. Acad. Nat. Sci. Philadelphia, vol. 81, p. 570, 1930. 

 •' Journ. Siam Soc. Nat. Hist. Hist. Suppl., vol. 8, p. 159, 1831. 

 M Proc. Acad. Nat. Sci. Philadelphia, vol. 86, p. 256, 1934. 



