542 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



The two examples of March 28 had the gonads greatly enlarged. 

 The bird of October 20 is in postnuptial molt. 



De Schauensee notes (1929) that his specimen had the irides dark 

 brown ; the bill black ; the feet and toes olive-brown. 



The male has the front and crown grayish olive-green; a narrow 

 nuchal band and the rump and upper tail coverts metallic purple ; the 

 remaining upperparts, including the exposed portions of the wings and 

 tail, golden olive-green (a patch of feathers at either side of the lower 

 back with concealed white bases) ; the underparts creamy white, grad- 

 ually deepening posteriorly to become bright yellow on the under tail 

 coverts, the feathers of the chin, throat, breast, belly, and flanks with 

 broad dark olive-green central streaks ; all but the central pair of rec- 

 trices narrowly tipped beneath with creamy white. The female differs 

 in having the nape, rump, and upper tail coverts golden olive-green 

 like the mantle and in lacking the concealed patches of white at the 

 sides of the lower back. 



ARACHNOTHERA LONGIROSTRA LONGIROSTRA (Latham) 



Assamese White-throated Spider-hunter 



[Certhia] longirostra Latham, Index ornithologicus, vol. 1, 1790, pp. 299-300 

 ("Bengala"; type locality restricted to Sylhet, Assam, by Stuart Baker, 

 Journ. Bombay Nat. Hist. Soc, vol. 28, 1921, p. 90) . 



Araclmothera longirostris, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 

 1913, p. 45 (Ban Huai Horn) ; Journ. Nat. Hist. Soc. Siam, 1915, p. 171 

 (listed). 



Arachnothera longirostris longirostris, Gyldenstolpe, Ibis, 1920, p. 464 ("North- 

 ern Siam"). — Greenway, Bull. Mus. Comp. Zool., 1940, p. 191 (Doi Ang Ka, 

 Doi Nang Kaeo). 



Aracnothera longirostra longirostra, de Schauensee, Proc. Acad. Nat. Sci. 

 Philadelphia, 1929, p. 564 (Chiang Saen, Chiang Rai). 



Arachnothera longirostra longirostra, Deignan, Journ. Siam. Soc. Nat. Hist. 

 Suppl., 1931, p. 155 (Chiang Mai) ; 1936, p. 125 (Chiang Mai). 



The white-throated spider-hunter is generally distributed in the 

 lowlands of the Mae Khong drainage basin but occurs only locally in 

 other parts of our area : thus, while it is rather common on Doi Ang 

 Ka at 4,400 feet, it is quite unknown from precisely similar territory 

 on Doi Suthep and has been found at Chiang Mai only once as a 

 straggler (July 10, 1930). It has not yet been reported at all from 

 the provinces of Mae Hong Son and Lampang. 



This bird is primarily a species of the evergreen and, like An- 

 threptes h. lisettae, has a strong predilection for the dense groves 

 of palms and wild bananas that often occupy the ravines. In Chiang 

 Rai Province, however, perhaps as a result of its greater numbers, it 

 is seen, not infrequently, in the coconut plantations of towns and 

 villages. 







