18S7.] PROCEEDINGS OP UNITED STATES NATIONAL MUSEUM. 517 



aud stouter, the upper parts (especially on licatl and ueck) less casta- 

 neous, and white markings on side of head nearly obsolete. 



Adult male (Diamautiua, Lower Amazon, June 13, 1887; C. B. Riker): 

 Pilenm and hind-neck dull sepia-brown, darker anteriorly, tinged with 

 raw-umber posteriorly; rest of upper parts (except tail) jilain bright 

 burnt-umber brown, tinged with chestnut on back, lighter on rump and 

 upper tail-coverts ; wing-feathers with concealed portion dull grayish 

 and dusky; tail broadly barred or banded with black and light brown, 

 the bands regular and very sharply defined, and ten or more in number; 

 sides of head dull blackish, faintly relieved by a very narrow, incon- 

 spicuous, and interrupted superciliary streak of white, and a few ex- 

 tremely narrow shaft-streaks of the same on auriculars; chin and throat 

 white, strongly and very abruptly contrasted with the uniform black of 

 the malar region ; chest grayish white medially, deeper grayish later- 

 ally; middle of breast and belly dull, pale, grayish buffy; sides, flanks, 

 and under tail-coverts light grayish brown tinged with fulvous, the lat- 

 ter barred with dusky; upper mandible black, with paler cutting-edge; 

 lower mandible plumbeous ; tarsi dark horn color, toes paler. Length 

 (skin) 5.50; wing 2. GO, tail 2.40, exposed culmen .72, bill from nostril .49; 

 depth of bill through nostril .22, tarsus .95. 



Young female (Diamantina, June 27, 1887, C. B. Riker): Essentially 

 like the male, but black "mask" replaced by uniform dusky grayish, 

 the white supra-auricular streak replaced by a very indistinct line of 

 pale brownish, and the under tail-coverts plain pale brownish. Length 

 (skin) 5.50; wing 2.40, tail 2.30, exposed culmen .GO, tarsus .85. 



An adult (sex not determined) from " forest 20 miles back from Di- 

 amantina, July 13, 1887," is in coloration exactly like the type, and 

 measures as follows: Length (skin) 5.30; wing 2.50, tail 2.40, exposed 

 culmen .G5, bill from nostril .45, depth at nostril .18, tarsus .90. 



This wren is apparently related to T. amazonicus Sharpe (Cat. B, 

 Br. Mus. vi, 235, pi. xv, fig. 1), and T. (jriseiiiectus Sharpe {t. c, p. 23G, 

 pi. XV, fig. 2), especially the former, from which it may not in reality 

 be distinct, though it does not agree with Sharpe's description, and is 

 strikingly different from his colored figure. It is probably the Lower 

 Amazon representative of that form, which belongs to the Upper Ama- 

 zon (Sarayacu, Ecuador), as does also T. griseipectus. 



[Named in honor of Mr. Herbert Riker, of Diamantina, Brazil. — C. 

 H. R.] 



lireast, the latter color passing gradually into deep raw-umber brown on flanks ami 

 tibiiv? ; under tail-coverts pale brown barred with blackisb. Length (skin) 5.40 ; 

 wing 2.45, tail 2.20, exposed culmen .63, depth of bill through nostril .17, tarsus .95. 

 In coloration of the under parts this species (or subspecies) agrees very closely 

 with T. herherti, from the Lower Amazon, but the bill is much more slender, the 

 general size less, the superciliary stripe veiy distinct (instead of nearly obsolete), 

 the auriculars very distinctly streaked with wliito, and the upper parts much deeper 

 chestnut. T. coraya is similar in the coloration of the Jipper parts, but the lower 

 parts are very different, the whole surface posterior to the throat being uniform deep 

 tawny or ochraceous, darker laterally. 



