66 PROCEEDINGS OF THE NATIONAL MUSEUM. 



SIRYSTES SIBILATOR ATIMASTUS, new subspecies. 



Chars. s«%j.— Similar to Sirystes siVdator sihilatoi\ but slightly 

 smaller; the upper parts lighter and more grayish; the lower surface 

 somewhat paler; the rump distinctly whitish. 



Descrijytion.—Ty^Q. adult male, No. 129412, U.S.N.M.; Chapada, 

 Matto Grosso, Brazil, March 13, 1885; H. H. Smith. Crown and occi- 

 put dull black; upper tail-coverts dark sepia brown, edged with gray- 

 ish; remainder of upper surface olive gray, the feathers with median 

 streaks of dark brown, bi-oadest on the back and scapulars, the rump 

 white, washed with yellowish gray; tail blackish brown, margined with 

 buflfy; wings blackish brown, the lesser and median coverts edged with 

 dark olive gray, rather paler on the latter, the greater series, with the 

 secondaries, margined with grayish white; lores, cheeks, and auriculars 

 brownish slate color; sides of neck medium gray, with a wash of green- 

 ish; chin, breast, and throat pale dull gray; rest of lower surface white, 

 the sides washed with yellowish; under wing-coverts light gray with 

 brownish centers; axillars pale yellow. Length of wmg, 91 mm. ; tail, 

 79 mm.; exposed culmen, 16 mm.; tarsus, 20 mm.; middle toe and 

 claw, 12 mm. 



The most conspicuous character distinguishing the present form from 

 true sihilator is the distinctly whitish rump. In this respect S. s. 

 atimastus approaches Slrijstes alhocinereus, but differs in the conspicu- 

 ously streaked upper surface, though suggesting that alhocinereus may 

 ultimately prove to be only subspecitically separable. 



Family TROGLODYTIDiE. 



THRYOPHILUS ALBIPECTUS BOGOTENSIS Hellmayr. 



Thryophilus albipeclus bogotensis Hellmayr, Verhandl. k. k. Zool.-bot. Gesellsch. 

 Wien, 1901, pp. 770, 774. 



Chars. sp.—SimWuv to Thryophilns alh'pectns Cahanis, but bill rather 

 longer; entire upper parts, including wings and tail, very much darker; 

 streaking on cheeks more conspicuous; sides of head and neck more 

 grayish; throat and breast more tinged with brownish; flanks and 

 crissum more deeply rufous. 



Descrfption. —AdiiM female, No. — ,' collection of Carnegie Mu- 

 seum; Don Diego, Santa Marta, Colombia, May 12, 1901; Mrs. H. H. 

 Smith. Above deep reddish brown, rather paler on rump and upper 

 tail-coverts; tail chestnut, barred with blackish; wings fuscous, the 

 lesser and median coverts like the back, the greater series, tertials, and 

 external webs of other wing-quills finely barred with the same color; 

 superciliary stripe dull white, lores and postocular stripe dull brown, 

 the former mixed with whitish; cheeks, auriculars, and post-auricular 



^Kot numbered. 



