546 BULLETIN 18 6, UNITED STATES NATIONAL MUSEUM 



sembles the adult female but has the rump concolorous with the mantle 

 and the upper tail coverts dull dark orange. 



D. c. siamense differs from erythronotum (China) by its shorter 

 wing length and (in the female) by having the upperparts less strongly 

 tinged with rufescent and the underparts buffy rather than oliva- 

 ceous-cream. From cruentatum (Bengal) it differs by having the 

 underparts in either sex less rich buff. I cannot distinguish it from 

 ignitum (Malacca) by the characters relied upon by the describer but 

 find that males of siamense are separable from those of ignitum in 

 having the sides of the head and throat slaty black and the sides of 

 the breast slate, instead of having these parts (as well as the upper 

 flanks) uniformly deep black. Exceptional examples of siamense 

 from the southern portions of its range are identical with ignitum, 

 but such birds do not occur farther north and, in series, the two races 

 have a quite different appearance. 



DICAEUM CONCOLOR OLIVACEUM Walden 



Indo-Chinese Plain-colored Flowerpecker 



Dicaeum olivaceum Walden, Ann. Mag. Nat. Hist, ser. 4, vol. 15, 1875, p. 401 



(Toimgoo and Karen Hills). 

 Dicaeum olivaceum, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 1913, p. 46 



(Phrae). 

 Dicaeum minullum olivaceum, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1916, p. 36 (Khun Tan). — de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1929, p. 565 (Chiang Mai, Chiang Saen). 

 Dicaeum minullus olivaceum, Gyldenstolpe, Ibis, 1920, p. 466 ("Northern Siam"). 

 Dicaeum minullus inornatum, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1928, p. 561 (Doi Suthep). 

 Dicaeum concolor olivaceum, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 



p. 156 (Chiang Mai, Doi Suthep) ; 1936, p. 126 (Chiang Mai, Doi Suthep).— 



de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 244 (Chiang 



Mai, Khun Tan, Doi Chiang Dao).— Klley, U. S. Nat. Mus. Bull. 172, 1938, 



p. 518 (Chiang Mai, Khun Tan, Lampang). 



This flowerpecker is not yet recorded from Mae Hong Son but may 

 confidently be expected to occur there, since it is a fairly common resi- 

 dent of all the other northern provinces. It is typically a bird of the 

 plains and lower mountain slopes, but I have frequently seen it on Doi 

 Suthep up to 3,500 feet, and de Schauensee has found it on Doi 

 Chiang Dao as high as 5,500 feet. 



The present form appears both in gardens and in the mixed- 

 deciduous jungle of the hills, but its favorite habitat is the dry, 

 deciduous forest, where it finds in abundance the hemiparasitic 

 growths of the mistletoe (Loranthus spp.), of which it eats the berries 

 and distributes the undigested seeds. 



