194 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



from Trang is given as 4% and 5 pounds. The two males from 

 Tenasserim weighed 5% and 6/4 pounds; the two males from Chance 

 Island 5)4 and 5% pounds. 



The immature male collected by Dr. Smith has the bill smooth 

 at the base, and the casque is just m the process of forming; otherv^dse 

 it is like the adult and of about the same size. Even the dark gular 

 bar has begun to form. There are several apparently adult speci- 

 mens of this species in the United States National I^luseum that 

 have the corrugations at the base of the bill barely indicated, but 

 they have the interrupted black bar across the gular pouch. It is 

 probable that it takes several years for the bill and casque to reach 

 full development. Apparently the presence of the corrugations at 

 the base of the bill are not entirely diagnostic. This species is 

 evidently much larger than subruficollis. 



R. undulatus ranges from Borneo, Java, and Sumatra to the Malay 

 States and northward to Siam, Burma, eastern Bengal, and Assam 

 south of the Brahmaputra; east it extends to Cochinchina, Laos, and 

 Annam. In Siam it has been recorded from nearly the whole country, 

 as well as from a number of islands off the coast such as Koh Kut, 

 Terutau, Puket, and Pulo Lontar. Evidently it is the commoner 

 of the two species of Rhyticeros occurring in Siam. 



RHYTICEROS SUBRUFICOLLIS (Blyth) 



Buceros subruficollis Blyth, Journ. Asiat. Soc. Bengal, vol. 12, p. 177, 1843 

 (vicinity of Moulraein, Tenasserim). 



Dr. W. L. Abbott collected one male and one female in Tenasserim 

 (Telok Krang, February 14, 1904; Telok Besar, February 27, 1904); 

 and two males on Domel Island, Mergui Archipelago, Januar}^ 24, 

 30, 1904. He gives the soft parts as: Male — iris red or orange-red; 

 orbital skin reddish purple; gular pouch yellow; bill dull ivory white 

 with a bluish tinge, slightly tinged with brown about middle, becom- 

 ing reddish brown at base, a narrow black line at base of lower man- 

 dible; casque yellowish ivory, reddish brown at base, bottom of 

 grooves black or dark brown; tarsi black in front, dull leaden behind, 

 soles gray, and claws black. Female — iris dark orange-brown; throat 

 dark blue, crossbar black; bill ivory white, brownish at base; casque 

 ivory white, bottom of grooves dark brown. The weight of one 

 Telok Krang male is given as 5 pounds; the two males from Domel 

 Island as 4K and 4 pounds. 



The species ranges from Borneo and Sumatra to the Malay States 

 and northward to Tenasserim, southern Burma, southwestern and 

 northern Siam. There are no records of this hornbill from Peninsular 

 Siam and there are apparently not many from the Malay States. 



