218 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 

 ACEROS UNDULATUS TICEHURSTI (Deignan) 



Northern Waved Hornbill 



Rhyticeros undulatus ticehursti Deignan, Auk, vol. 58, 1941, p. 397 (Huai Oi, 



14 km. north of Ban Pak Li, Nan Province, North Thailand). 

 Rhytidoceros suoruficollis, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1913, p. 56 (Mae Raem) ; Ibis, 1920, p. 587 (Mae Raem). 

 Rhytidoceros undulatus, Gyldenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, p. 232 



(listed) ; Kungl. Svenska Vet.-Akad. Handl., 1916, p. 113 (Pha Hing) ; Ibis, 



1920, p. 587 (Pha Hing). 

 Rhyticeros sp., de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 263 



(Chiang Rai, Chiang Saen). 

 Rhyticeros undulatus, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, p. 94 



(Doi Suthep). 



The waved hornbill is a bird of the tall evergreen, from the plains 

 to 5,500 feet. In the provinces east of the Khun Tan range it is com- 

 mon wherever the jungle is suitable; farther west it seems to be very 

 rare. With the exception of an example mentioned by me in 1936, 

 said to have been bred on Doi Suthep, my only record for that moun- 

 tain was made November 7, 1936, when at least three (a male and two 

 females) were observed at 5,500 feet, and, later in the same day, a flock 

 of four (possibly the same individuals) were seen flying over the forest 

 far below the summit. 



This species, like Dichoceros h. cwatus, is usually found in small 

 flocks, flying above the trees with noisy wing beats and gathering 

 in some numbers wherever ripe fruit is plentiful. On Phu Kha, where 

 it was the commonest of its family, what appeared to be always the 

 same flock flew daily, early in the evening, over my camp, presumably 

 resorting regularly to a particular roosting tree. 



An old female, which lived for several months on a perch in my 

 garden at Chiang Mai, began at dawn to utter loud, hoarse, double 

 roars, with gular skin inflated and the head raised and lowered, and 

 continued her cries until she was fed. Although she was blind in 

 both eyes (probably from having been too much exposed to bright 

 sunlight while in the possession of a preceding owner), any fruit given 

 her was at once tossed into the air and swallowed as it fell into the 

 gaping bill ; I do not recall any occasion on which the object fell to 

 the ground. Water was frequently proffered her, but she was never 

 seen to accept it, apparently finding sufficient moisture in the juices 

 of fruits. 



A male from Ban Hai Hua Som, June 18, is in postnuptial molt. 



The female referred to above had the irides with a broad, vermilion 

 outer ring and a narrow, yellow inner ring ; the orbital skin dull red ; 

 the bill and casque old ivory, dull olive at the extreme base, with the 

 hollows of the corrugations stained dark brown ; the gular skin bright 

 blue, with a transverse black band, interrupted in the center ; the skin 



