424 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 

 MONTICOLA RUFIVENTRIS (Jardine and Selby) 



Chestnut-bellied Rock Thrush 



Petrocincla rufiventris Jabdine and Selby, Illustrations of ornithology, ser. 1, vol. 



3, pt. 9, no date [=1833], pi. 129 and text ("The Himmalayan district"). 

 Monticola erythrogastra, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1929, p. 543 (Doi Suthep). 

 Monticola rufiventris, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, p. 143 



(Doi Suthep). — de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, 



p. 211 (Doi Chiang Dao).— RrLEY, U. S. Nat. Mus. Bull. 172, 1938, p. 415 



(Khun Tan, Doi Langka). 

 Monticola rufiventris sinensis, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, 



p. 113 (Doi Suthep). 



The chestnut-bellied rock thrush is of regular but uncommon oc- 

 currence on the higher mountains of the Thanon Thong Chai and 

 Khun Tan ranges, from 4,000 to 5,500 feet; it has been found only 

 between November 4 (Doi Langka) and February 6 (Doi Suthep) but 

 probably arrives earlier and departs later than these dates would 

 imply. 



I have observed this bird, not at rocky places, but at clearings in 

 the evergreen and along forest trails. 



An apparently adult male of November 23 has the central pair of 

 rectrices only half-grown. 



De Schauensee states (1929) that an immature male had the irides 

 brown ; the bill horn ; the feet and toes brownish black. 



The adult male has the entire upperparts rich blue, brighter on the 

 forecrown, shoulder, rump, and upper tail coverts (in winter with nar- 

 row ashy tips to the feathers of the mantle and narrow white tips 

 to the remiges and greater coverts) ; the lores, ocular region, and 

 ear coverts black; the chin and throat dull blue (the feathers with 

 narrow ashy tips in winter) ; the remaining underparts, including the 

 under wing coverts and axillaries, rich chestnut. The adult female 

 has the entire upperparts plumbeous-gray, the feathers of the mantle 

 with narrow blackish shaft streaks and crescentic subterminal bars, 

 the upper tail coverts barred plumbeous-gray and blackish through- 

 out ; the throat with a pale buffy or buffy-white central streak, which 

 flares somewhat on the uppermost part of the breast; the feathers 

 beneath and behind the ear coverts buff, with narrow black tips, form- 

 ing an indefinite mustachial streak and a conspicuous light patch 

 at each side of the neck; the remaining underparts pale buffy or 

 buffy white, each feather with broad, crescentic blackish bars. 



MONTICOLA SOLITARIUS PANDOO (Sykes) 



Indian Blue Rock Thrush 



Petrocincla Pandoo Sykes, Proc. Comm. Sci. Corr. Zool. Soc. London, pt. 2, 1832, 

 p. 87 ("TheDukhun"). 



