BIRDS FROM SIAM AND THE MALAY PENINSULA 163 



This species is much like Collocalia lowi robinsoni, but if the above 

 specimen has been identified correctly it differs in having a shorter 

 wing, the rump paler wdth blackish shaft lines, and the wings more 

 bluish black; the lower parts have the shaft lines more conspicuous. 

 Both have feathered tarsi. 



COLLOCALIA LINCHI ELACHYPTEKA Oberholser 



Collocalia linchi elachyptera Oberholskr, Proc. Acad. Nat. Sci. Philadelphia, vol. 

 58, p. 207, 1906 (Bentinck Island, Mergui Archipelago). 



Dr. W. L. Abbott took the type series of this race, consisting of 

 three males and two females, on Bentinck Island, Mergui Archipelago, 

 March 9 and 10, 1900. 



This is a small race, wing 94-100 mm. 



Baker ^^ places the Malay States specimens with this race, but the 

 only two I have seen from there (Pahang and Singapore) are large 

 birds, with wings measuring 111-112 mm. 



C. I. elachyptera probably extends to the mainland of Tenasserim 

 and Peninsular Siam. 



KEY TO SIAMESE COLLOCALIA 



o'. Size very large; wing, 157-162 mm gigas 



o^. Size considerably smaller; wing less than 140 mm. 

 fei. Tarsus feathered. 



c'. Size larger, rump paler, tarsi densely feathered; wing, 

 124-135 mm. 

 d}. Size smaller; wing, 124-134 mm; chest with distinctly 



darker shaft lines; rump paler, with darker shaft lines iimomtnata 



(P. Size larger; wing, 135 mm or more; chest without dis- 

 tinctly darker shaft lines; rump darker lowi robinsoni 



c^. Size smaller; wing, about 112 mm; tarsi only slightly 



feathered; rump only slightly paler than back vestita amechana 



h^. Tarsus naked. 



c'. Belly concolor with breast; size larger; wing, 114-120 mm. 



d} . Lighter above ; rump lighter f rancica ger mani 



(fi. Darker above; rump darker francica inexpectata 



c^. Belly white; size smaller; wing. 111 mm or less. 



d}. Size larger; wing, 103-111 mm linchi cyanoptila 



d^. Size smaller; wing, 94-100 mm linchi elachyptera 



Family TROGONIDAE: Trogons 



HARPACTES ERYTHROCEPHALUS ERYTHROCEPHALUS (Gould) 



Trogon erjjthrocephalus Gould, Proc. Zool. Soc. London, 1834, p. 25 (Rangoon, 

 Burma). 



One male, Doi Angka, 4,000 feet, December 4, 1928; one male, 

 summit of Doi Sutep, December 15, 1928; one male and one female, 

 Khun Tan Mountains, 3,000 feet, November 20, 1928, and May 10, 



M The fauna of British India, Birds, ed. 2, voL 4, p. 353, 1927. 



