130 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



THAMNOPHILUS OCHRUS Oberholser. 



Thamnophilioi ocJiriis Obekhol.sek, True-. Biol. Hoc. Washington, XIV, 1901, p. 



188. 



Char.s. .sjj. — Female resemblino- that of Thamnoj)hUus cxrulescens, 

 but rather lighter, more grayish above; the lesser wing-coverts black 

 instead of olivaceous; the entire ventral surface decidedly paler, the 

 breast grayish buff, the central portion of abdomen bufty white. 



Desct'ljption. — Type, adult female. No. 173378, U.S.N.M, ; Sapucay, 

 Paraguay, June 21, 1900; William T. Foster. Upper parts grayish 

 olive brown, more brownish on the scapulars and on the crown, the 

 fore part of which latter is lighter; the feathers of the center of the 

 back with large ill-concealed white spots usually in the form of broad 

 irregular bars, succeeded distally l\v a more or less evident suliterminal 

 mark of blackish; middle tail-feathers similar to the general tone of 

 the back, though rather darker, unmarked with white, the remaining 

 rectrices brownish black, margined with brownish slate, and tipped 

 with white, the outer pair with also a white bar about 7 millimeters 

 wide near the middle of the external web; wing-quills fuscous, edged 

 exteriorly with olive brown; all the superior coverts black tipped with 

 white, the greater series margined basally with grayish olive brown; 

 lores, cheeks, and e^-e ring grayish white, much mixed with grayish 

 olive; sides of neck and head l)ehind the eyes grayish olive, the auricu- 

 lars rather darker with shaft lines of buffy white; chin and throat 

 grayish white mixed with dusky and very faintly washed with ochra- 

 ceous; breast grayish buff — or better, dull pule gray washed with 

 ochraceous buff'; sides, flanks, and crissum plain ochraceous, the cen- 

 ter of abdomen and lower breast dull ])ufly white; under wing-coverts 

 and inner margins of wing-quills buffy white; axillars buffy ochraceous. 

 Bill brownish black, the base of mandible paler; "iris brown." Length 

 of wing, 70 mm. ; tail, 65 mm. ; exposed culmen, 12 mm. ; height of 

 bill at base, 5.5 mm.; tarsus, 23.5 mm., middle toe, 13 mm. 



Only a single specimen, the female above described, was obtained 

 by Mr. Foster, but this apparently differs so greatly and in so many 

 respects from the same sex of all allied species that it seems undoubt- 

 edly to represent a form hitherto undescribed. It seems to be nearest 

 ThavivopkiJus exrulescens in size and proportions, and in these respects 

 scarcely exhibits material difference, though in color it is of quite other 

 appeai-ance, as above set forth. The only other species with which it 

 seems to have at all close aflinity is Thanuiopli'dus asperslventer 

 d'Orbigny and Lafresnaye,^ from Yungas, Bolivia, but judging from 

 the various descriptions of this latter, the female of ThamnopTiilus 

 ochrus is very much paler below, having a broad buffy white area on 



^Synopsis Avium, I, 1837, p. 10; d' Orbigny, Voyage Amer. Merid., IV, Ois., 

 1835-44, p. 171, pi. IV, figs. 1 and 2. 



