1887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 523 



wing-coverts and broad edges to remiges yellowisli-white. Upper mand- 

 ible black, lower lighter (plumbeons in life?); legs and feet dusky. 

 Length (skin) 5.20, wing 2.55, tail 2.15, exposed culmen .05, bill from 

 nosrril .40, depth at nostrils .27, tarsus .80. 



This species has almost exactly the same size and form as T. miirinus 

 Natt., but difters decidedly in coloration, as shown above. I am unable 

 to identify it with any described species. 



9. Heterocnemis (?) hypoleuca, sp. no v.? 



Sr. CHAR. — Adult female apparently most nearly resembling the same 

 sex of H. albivcntris Pelz.,* but general color above more rufescent (the 

 head es])ecially), with pale cinnamon terminal spots on greater and mid- 

 dle wing-coverts much larger, and wing and tarsus decidedly longer. 



Habitat. — Lower Amazon (Diamautiua). 



Adult female (Diamantiua, Lower Amazon, July 11, 1887; C. B. 

 Riker) : Pileum and hind-neck burnt-umber brown, passing into bright 

 cinnamon-brown or russet on forehead and sides of head, the color be- 

 coming gradually pale ochraceous or ochraceous-buff on malar region ; 

 back, scapulars, rump, and upper tail-coverts raw-umber brown ; wings 

 and tail russet-brown, the middle and greater coverts of the former 

 broadly but not very distinctly tipped with dull ochraceous or cinnamon- 

 buft'. Lower parts pure white, tinged on chest and under tail coverts 

 with buflfy, the longer feathers of the latter with a distinct mesial streak 

 of buff; sides and flanks light buffy grayish brown. Upper mandible 

 black, lower whitish ; legs and feet dusky (horn-color or plumbeous 

 in life?). Length (skin) 5.00, wing 2.80, tail 1.90 (graduated for .35), 

 exposed culmen .70, bill from nostril .48, depth at gonydeal angle .20, 

 tarsus 1.05, middle toe .G5. 



Not having any species of Heterocnemis with which to compare this 

 bird, I am not sure that it is correctly placed in that genus. In form, 

 especially of the bill, it agrees pretty well with some species of Hypoc- 

 nemis, except that the tail is much more rounded. It may possibly be 

 the same as von Pelzeln's H. alhiventris, which Sclater considers to 

 be probably the female of JET. argentatus (Des MuRs)t of the Upper 

 Amazons ; but in VON pelzeln's description no mention is made of the 

 bright cinnamon-brown color of the forehead and sides of the head, the 

 spots at tips of wing-coverts are described as "parvis ferrugineis," while 

 the proportions are different.^ 



* Orn. Bras. 1871, 161 (Engenlio do Gama, Matogrosso, Guajara guaQu, Girao, Borba, 

 and Marabitanas, Brazil). 



i Herps'doclimus argentaius Des Murs, Voy. Casteln. Zool., 53, pi. 17, fig. 2 (Nauta, 

 Upper Amazons). Cf. Pelz., Oru. Bras. 1871, 162 ; SCL. P. Z. S. 18. 



t The description is as follows : 



"Femiua: Supra olivacea brunuea alis et cauda brunneis, tectricibus alarum macnlis 

 parvis ferrugineis terminatis, gula et abdomiue medio albis, pectore in iiuo indi- 

 viduo albo ferrugiueo lavato, in duobus aliis ferrugiueo, lateribus colli et pectoris 

 et gastneo reliquo ferrugineis, hypochondriis olivascentibiis. " Lougit. 6", alaj 

 2" 6'", caudie 1"10-11"', rostri a rictu 11^" (?), tars 11^'". 



