2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



PLANESTICUS OLIVACEUS POLIUS, new subspecies 

 Samboru Thrush 



Type-specimen. — Adult male, Cat. No. 217725, U. S. National 

 Museum ; collected at 6,000 feet altitude on Mount Lololokui, in the 

 Samboru country, north of the Guaso Nyiro River, in British East 

 Africa, September 8, 191 1, by Edmund Heller. (Original number, 



3I7-) 



Characters. — Most closely related to Planesticus olivaceus abys- 

 sinicus (Gmelin), but smaller (see tabulated measurements below), 

 grayer on the upper surface, as well as on the chest, throat, and 

 sides of head and neck ; lores blacker ; the blackish shaft-streaks on 

 chin and throat sparser and narrower ; abdomen and sides paler and 

 more olivaceous orange ; the orange of the under surface of the wing 

 is confined to the axillars and under wing-coverts, not extending 

 upon the inner webs of the under surface of the quills. 



Description of adult male and female. — Upper surface mouse 

 gray ; wings and tail darker, the quills and rectrices crossed by indis- 

 tinct, rather broad, blackish bars ; lores black ; chin, throat, sides of 

 head, and neck light mouse gray ; chin and upper throat with a 

 few central shaft-stripes of blackish ; abdomen, sides, axillars, and 

 under wing-coverts ochraceous-buff ; flanks olive-gray ; anal region 

 white ; under tail-coverts neutral gray with broad central white stripes 

 occupying the entire end of the feathers ; bill apparently orange ; 

 feet and claws brownish yellow. 



Measurements of type (adult male).- — Wing, no; spurious pri- 

 mary, 28; tail, 86; culmen (chord), 20; tarsus, 31.5. 



Material. — Eight skins, in the Paul J. Rainey collection : three are 

 from Mount Lololokui, and five from Mount Gargues, in northern 

 British East Africa, all collected by Edmund Heller. 



Remarks. — From Jackson's Thrush (Planesticus olivaceus clgon- 

 ensis) , this subspecies may readily be distinguished by its inferior size 

 and paler, more grayish, coloration. 



