(375 ) 



the sides of the bell}' have a delicate, pale creamy buff hue. Wing 52 — 54, tail 

 49—53, bill 22—25 mm. 



Material. 1 J" ad., Telle (type), 1 c? ad., Hurnaytka, c? ¥ ad., Borba (Mns. 

 Tring); 1 c? Yurimaguas, 1 ad., Santa Cruz, 1 av. juv., Chyavetas (Mns. Tring 

 and Brit.). 



e. 11. m. stieturus Hellm. 

 Rhamphocaenus stieturus Hellniayr, Verhandl. :.<>->l. botan. <!, tell h. Wien. 1902. p. '.i7 (Mattogrosso). 



Hab. Western Brazil, Mattogrosso : Villa Bella de Mattogrosso, Engenho 

 do Gama and San Vicente (Natterer). 



Adult. At once recognisable from all the preceding forms by having (lie 

 three outer pairs of rectrices tipped with pure white. Upper parts as in /,'. m, 

 trinitatis, but back lighter, clear earthy brown ; cheeks and ear-coverts rufesceut 

 buff as in li. m. melanurus, sides of the neck pale ochraceous buff, decidedly 

 lighter than in a and b. Under parts exactly as in pale-bellied specimens of 

 li. m. trinitatis, foreneck and sides being washed with bright cream-buff (Ridgw. 

 v. 11). Wing 50—51, tail 41—45, bill 22— 24} mm. 



Material. 8 adults, of both sexes, from Mattogrosso (Natterer coll., Vienna 

 Museum). 



88. Sclateria argentata (Des Murs). 



Herpsilochmus argentatus Des Murs in : Castelnau's Voyage, Oiseaux, p. 53. tab. 17. fig. 2 (June 

 18oG.— Nautu, N.E. Peru). 



HelerocTiemis albiventris Pelzeln, Zur Omith. Brasil. ii. p. 101 (1868.— Engenho do Gama, Matto- 

 grosso ; Guajara-guacu, GrirSo and Borba, Rio Madeira ; Marabitanas, Eio Negro). 



Nos. 1027, 1137. S3 ad., Ilumaytha, 31. vii., 27. viii. DO. "Iris brown, feet 

 greyish yellow, bill black."— Wing GO, 701 ; tail W},, 51 ; bill 23, 24 mm. 



These specimens agree well with others from Maipures, Orinoco River (Tring 

 Museum) and the Peruvian Amazons (British Museum). Thanks to the kindness 

 of Dr. von Lorenz, I have been enabled to examine the series upon which Pelzeln 

 founded his If. albiventris. This consists of adult males from Girao and Guajara- 

 guacu, females from Borba and Marabitanas, and four examples from Mattogrosso, 

 two of each sex. The S <? from the two first-named localities are those described 

 by Pelzeln as the adult <Jcf, and agree with our specimens from Humavtha 

 and Maipures in having the under-snrface white with the sides of the neck as well 

 as of the breast and abdomen schistaceous. Hence //. albiventris becomes a strict 

 synonym of //. argentatus. The two c? $ from Mattogrosso considered by Pelzeln 

 to represent the plumage of the immature $, differ by having the schistaceous 

 colour of the sides more extended, and by the feathers of the chest being 

 distinctly edged with cinereous. Although I do not take these characters to 

 be signs of immaturity, yet a larger series of specimens is required to establish 

 the status of the Mattogrosso form. 



S. argentata is a very near ally of <$'. naevia (Gm.), differing solely by the 

 coloration of the under parts. In structure the two species arc practically identical. 



80. Sclateria schistacea humaythae Hellm. 

 Sclateria /" lacea humaythae Hellmayr, /.'«//. /;. ". (_'. \ix. (Febr. 1907) p. 51. 



Nos. 053, 1002, 1012, 1077, 1120. 6S ad., Ilumaytha, 19, 27, 2'.'. vii, 12. viii, 

 13. ix. nO. " Iris grey or greyish brown, feet greyish yellow or gre\ ish brown, bill 

 black."— Wing 70—73, tail 51—55, bill 20— 21 J, mm. 



2(i 



