( 161 ) 

 [265.;Sclateria argentata (Dea Mnrs). 



Berimlochmus aryentatus Des Murs, Voij. CaUdn. Ois. (1855) p. 53. PI. xvii. fig. 2 (typ. ex Nauta, 

 Amaz. sup. in Mus. Paris, (J jr.— ^(fe Meneg. & Hellm.). 



Oyapoc : S jr. (Sclater collectiou iu Mus. Brit.).] 



[266. Myrmelastes melanothorax (Scl.).* 



Thamnophilus melanothorax Solater, P.Z.S. 1857. p. 1.33 (descr. J hab. " in America meridionili " ?^ 



hab. substit. Cayenne). 

 Tluimnoph'dns inoestiis Pelzeln, 1868 (typ. ex Cayenne). 

 Thamnophilus camopiensis Menegaux, 1901 (typ. ex Camopi, Cayenne). 



Cayenne (Mus. Viadob.), Camopi, Frencli Gaiaaa (coll. Geay in Mus. Paris).] 

 267. Percnostola rufa (Bodd.). 



Tunlus nifus Boddaert, Tabl. PL Enl. (1783) p. 30 (ex Daubenton, PL Eul. 644. fig. 1.— typ. ex 



Cayenne) $ . 

 Perciioslola /unehrh (Licht.). 



Ipousin, R. Approuague : 1 S ;ul., January 5, 1903; 1 <S juv. in transition 

 plumage, December 24 ; 3 ¥ ¥ ad., December 26, 1902. 



"Iris eliestnut (t? ad.), ' .sejiia ' (c? juv.), '.seal, brick-red, bazel' ( ¥ ), feet 

 slate-grey (' greyish flesh, plnmbeous), bill black (' above black, below slate-grey ')." 



Nos. 1283U, 12996, 13026, 1.5419, 15422. 



c? ad. : al. 75J— 73^ ; cand. 60-J ; culm. 21}— 19J ; tars. 29J— 27f mm. 



? ¥ ad. : al. 75— 71i ; cand. 62|— 6U^ ; cnlm. 201—19} ; tars. 29^—28^ mm. 



Cayenne (Mus. Paris, dd, ¥, e.x Poiteau, Langier et Milne-Edward.s, Mns. 

 Vindob., d (ex Becoeur), Sclater coll. in Mus. Brit.). Oyapoc, Cayenne (Sclater 

 collection in Mus. Brit.). 



268. Cercomacra nigrescens (Cab. & Heine). 



Percnostola nigresceus Cabanis et Heine, 3Iiis. Hcin. ii. (July 1859) p. 10 (descr. orig. typ. ex Cayenne 

 in Mus. Hein.). 



Approuague : 8 cJc? ad., December 6, 8 (four), 10 (two), 13 ; 1 (? imm. 

 with remains of the rufous plumage, December 8 ; 6 ¥ ¥ ad., December 6, 8 (three), 

 9; 1 ? (probably young male), December 0, 1902. 



"Iris drab (' sepia'), feet ' grey ' (plumbeous), ' bill black ' (' above black, below 

 grey,' 2 ¥ ¥)." 



Nos. 1027, 1028, 1029, 1036, 1037, 1038, 1041, 1042, 1043, 1044, 1045, 1073, 

 1088, 1089, 1140. 



S3 ad. : al. 72^—69 ; caud. 70— 64J; cnlm. 20|— 19^ ; tars. 25|— 23f mm. 



¥ ¥ ad. : al. 69-66 ; caud. 62^—59 ; culm. 19|— IS] ; tars. 24|— 234 mm. 



There is a good deal of individual variation, as illustrated by the specimens 

 composing the series now before me. Some individuals have the nj)per wing- 

 coverts of a nearly uniform black, while others have them slightly tipped or 

 margined with white ; others show but very slight traces of the white apical 

 margins, and are perfectly intermediate between those with the uniform black 

 wing-coverts and those with the white-tipped coverts. 



• Meneg. & HcUm,, Bull. Sac. Phil, ile Pari/ 1D06. p. 33. 



11 



