i887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 521 



rump and upper tail-coverts ; middle and greater wiug-coverts broadly 

 tipped with pule dull cinnamou or Isabellacolor, and rectrices more 

 narrowly tipped with same. Lower parts, from chest backward, pale 

 yellowish buff, instead of sulphur-yellowish. Otherwise like adult. 

 Length, (skin) 3.G5 ; wing 1.95, tail 1.50, exposed culmen .30, bill from 

 nostril .22, tarsus .55. 



Another adult female is essentially like the one described above, but 

 the pileum is not nearly so dark, and the whitish streak above the lores 

 and eyes is more distinct. Length (skin) 3.30; wing 1.80, tail 1.40, 

 exposed culmen .28, bill from nostril .25, tarsus .52. 



The young bird described above resembles closely in general appear- 

 ance two young birds from Guayaquil, determined by Mr. Lawrence as 

 O.pusillum (Cab.), but besides being decidedly smaller is much darker 

 in color, the upper parts less gray, the lower surface more distinctly yel- 

 lowish, the wing-bands much more distinct, the rump more distinctly 

 ciunamomeous, the pale cinnamon tip to tail much narrower, etc, 



Not having seen a specimen of O. inenne Hartl., I am unable to 

 state the exact differences between that species, which belongs to Guiana, 

 and the present one. Dr. Sclater describes the former as follows: 

 " Above olivaceous, the pileum tinged with ashy; lores distinctly white; 

 wings and tail brownish black, the wing-coverts distinctly tipped with 

 yellowish white; beneath pale yellow, the throat more whitish. Total 

 length 2.2; wing 1.80, tail 1.10." (Translation ; cf. P. Z. S. 1873, p. 577.) 

 He further says that 0. inerme is very similar to 0. pusillum, but has 

 the bill longer, the tail shorter, and the lores distinctly white. It would 

 therefore appear that 0. najjmim differs from O. inenne in the grayish- 

 dusky streak on lores, darker pileum, longer wing, and very much longer 

 tail (1.40-1.55 instead of 1.10). 



6. Tyraiinulus reguloides, sp. uov. 



Sp. char.— Similar to T. elatus (Lath.) but smaller, black border to 

 crest much narrower and less distinct, and hind-neck and sides of head 

 much more ashy. 



Habitat. — Diamantina, Lower Amazon. 



Adult (Diamantina, Lower Amazon, June 30, 1887; C. B. Riker): 

 Crown clear canary-yellow, bordered laterally with slaty-blackish, this 

 fading anteriorly (on forehead), laterally (on superciliary region), and 

 posteriorly (on nape) into ash-gray, and this in turn fading on lores, 

 cheeks, chin, and throat into pale ash-gray or grayish white; back, 

 scapulars, rump, and upper tail-coverts plain olive-green (as in T. elatus); 

 wings brownish dusky, the middle and greater coverts sharply tipped 

 with yellowish white and secondaries sharply and rather broadly edged 

 with the same, except toward base, their edgings broader on tertials. 

 tail dull grayish brown, the feathers edged with light olive-greenish 

 and narrowly tipped with pale yellowish olive. Chest, sides, and flanks 

 pale olive-greenish, fading into sulphur-yellow on belly, under tail- 

 coverts, and lining of wing. Bill deep black ; legs and feet duller 



