200 BULLETIN" 17 2, UNITED STATES NATIONAL MUSEUM 



There seems to be no constant difference in color in specimens 

 from northern Siam and Peninsular Siam and very little difference in 

 size. There is a gradual diminution in size from north to south, but 

 the difference is not great enough to recognize by name, and for this 

 reason I place under one name all the specimens of this species from 

 Siam. 



Five males from northern Siam (4) and eastern Burma (1) measure: 

 Wing, 126.5-132 (128.4); tail, 74-84 (80.6) ; culmen, 29-33 (31.4) mm. 

 Ten males from eastern and southeastern Siam: Wing, 120-133 

 (125.9); tail, 73-84 (78.6); culmen, 29-32 (30.5) mm. Eight males 

 from southwestern Siam (5) and Peninsular Siam (3): Wing, 121-128.5 

 (124.7); tail, 72-81 (75.4); culmen, 28-32 (30.6) mm. 



The range of the form is quite an extensive one, being found from 

 central and southern Burma southward throughout Siam proper and 

 through Peninsular Siam to the Malay State of Trengganu ; eastward 

 it extends to Laos, Annam, Cochinchina, and Cambodia. 



The form is not apparently uncommon all over Siam, from the north, 

 south throughout Peninsular Siam. Robinson and Kloss ^° say that 

 it does not occur in the Federated Malay States. 



There is considerable variation in the above series, from a spec- 

 imen with the head, throat, and chest cartridge buff, obsoletely 

 streaked with drab, to others in which the head above is almost 

 fuscous, with the light streaking almost reduced to shaft streaks and 

 the streaks on the chest equally dark. These variations seem to be 

 purely individual or to be due to age. There is one young bird col- 

 lected by Dr. Abbott that still retains the heel pad tubercles and that 

 in size and plumage I cannot distinguish from the adult, so this feature 

 must be retained for some time after the bird leaves the nest and their 

 use is no longer needed. Dr. Smith took a male in similar condition. 

 There are several other specimens in like condition in the collection 

 of the United States National Museum, and it is the only way to 

 distinguish the young after they become full grown or nearly so. The 

 wings of these specimens measure somewhat smaller than the average. 

 Count Gyldenstolpe '' has given a figure of the heel pad of this form. 

 There are two other form.s of this barbet recognized by Stuart 

 Baker," namely, Thereiceryx lineatus lineatus (Vieillot), from Java 

 and Bali, and Thereiceryx lineatus hodgsoni (Bonaparte), from the 

 Himalayas of India. The latter differs from T. I. intermedius in being 

 larger. I have seen no specimens of it. Specimens from northern 

 Siam have been assigned to hodgsoni, but I believe incorrectly so. 



'• Journ. Nat. Hist. Soc. Siam, vol. 5, p. 165, 1923. 

 " Ark. for Zool., vol. 11, no. 12, p. 5, 1917. 

 " Ibis, 1919, p. 214. 



