220 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



De Schauensee records that an adult male had the irides garnet; 

 the orbital region bright light blue; the bill creamy white, with the 

 basal half of the mandible more olive-green ; the grooves at the base 

 of the maxilla black, anteriorly gray ; the bare skin behind the mandi- 

 ble dark blue, followed by a flesh-colored area ; the gular skin almost 

 covered by an inverted heart of bright brick red, edged posteriorly by 

 deep blue, which is joined in a narrow line to the blue behind the 

 mandible ; a narrow brick-red line between the blue behind the heart 

 and the feathered portion of the foreneck; the feet, toes, and claws 

 black. An adult female differed chiefly in having the orbital region 

 rather duller; a dusky blue-black patch at the side of the throat 

 where the male had flesh color ; the whole throat brick red except for 

 a small deep blue triangle posteriorly. 



This is a medium-sized species that never develops a casque. The 

 adult male has the head, neck, and breast bright rufous, changing to 

 deep chestnut on the belly and under tail coverts; the rest of the 

 plumage green-glossed black, but with the tips of the longest primaries 

 and the apical half of the graduated tail feathers white. Smith's 

 female (a bird with only one groove developed on the maxilla) differs 

 in having the rufous of head, neck, and breast duller and much" sullied 

 with blackish. 



Indo-Chinese examples should be critically compared with topo- 

 typical material. The former may prove to be separable by lesser 

 dimensions. 



PTILOLAEMUS TICKELLI AUSTENI (Jerdon) 



White-throated Brown Hornbill 



Anorhinus austeni Jerdon, Ibis, 1872, p. 6 (no locality given ; type specimen from 



Asalu, North Cachar hills, fide Ogilvie Grant, Catalogue of the birds in the 



British Museum, vol. 17, 1892, p. 393). 

 Anorrhinus austeni, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 1916, p. 



113 (Khun Tan) ; Ibis, 1920, p. 586 (Khun Tan). 

 Ptilolaemus tickelli tickelli, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1934, p. 264 (Doi Suthep).— Deign an, Journ. Siam Soc. Nat. Hist. Suppl., 



1936, p. 95 (Doi Suthep). 



The little brown hornbill seems to be a bird of considerable rarity on 

 the higher hills of the western provinces. Gyldenstolpe shot a female 

 from a small flock at Khun Tan, June 4, 1914; de Schauensee took a 

 male at 3,500 feet on Doi Suthep, February 22, 1933 ; I found a pair on 

 Doi Chiang Dao, about 5,000 feet, December 8, 1936, and collected the 

 female. In addition to these specimens, I examined in Stockholm 

 three undated birds (an adult male and two juveniles) taken by Eisen- 

 hof er at Khun Tan. 



This species, usually seen in small flocks, acts much like Anthra- 

 coceros. De Schauensee's specimen was found at the edge of the ever- 



