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Bolivia) by its much paler belly, the breast beiiij; dull rusty buff, the iuner sides 

 and flanks light rufescent olive-brown. 



L. modidatfli- griaeolateralis replaces L. m. modtdator on the right bank of the 

 Rio Madeira, ranging eastward as far as Sautaiem, south bank of the Amazons. 



10. Thryothorus genibarbis genibarbis Sw. 



Thrijothorus geiiibarhis Swainson, Aiiim. in Menag. p. 'ii2 (1838. — " Brazil "). 

 Thryothorm melanoi (nee Vieillot) Pelzslii, Zw Oni. Bras. i. p. 48 (part. : Borba). 



No. 671. rj iram., S. Isabel, Rio Preto, It), x. 1007.— Wing (33; tail 5Ci ; 

 bill 18 mm. 



No. 646. ? ad., S. Isabel, 8. s. 1907.— Wing 59 ; tail 66 ; bill 16i mm. 



No. 380. Jnv., Calama, 11. viii. 1907.— Wing 59 ; tail 48 ; bill 15^, mm. 



No. 717. ? pull., S. Isabel, 19. x. 19U7.— Wing 59 ; tail 49 ; bill 14 mm. 



" Iris red (671), reddish brown (646), brown (380, 717) ; feet plumbeous (adult), 

 brownish Vilaek (juv.) ; bill black, below grey.'' 



These birds agree, in size and coloration, with typical T. geiiibarbis from 

 Bahia, except that the pileum and nape are distinctly rufescent brown, instead 

 of sooty. An adult male from Borba (Natterer coll.), however, is not different 

 on this score. The young bird, in nestling plumage, very closely resembles the 

 same stage of 7'. corayn (Gm.). 



T. g. qenibarbis ranges from Bahia north to l'ar;i, and westwards to the 

 right bank of the Madeira (Borba, Calama, S. Isabel). 



[11. Thryothorus genibarbis juruanus Ihering. 



Cf. Nov. Zool. xiv. p. 345 (Humaytha). 



Represents the foregoing on the left bank of the Madeira : Humaytha 

 (Hoffmanns;. It differs by its longer wings and rather paler under parts, yet 

 its validity requires confirmation by a larger series.] 



VZ. Thryophilus albipectus albipectus (Cab.). 



Thryolhorm albijnrlim Cabanis in S;hombargk, R^-^xni in Biit. GiOan'i hi. p. G73 (1848.— 



Cayenne). 

 Thrijnphilus lartiiop/rm Ridgway, Pyo,-. U.S. X,it. .Vm. x, 1887. p. 518 (1888.— Diamantiua near 



Santarem, Tapajdz). 

 Thri/olhorus leiinili.i (nee Lifi-esnaye) Pelzeln, I.e. p. 47 (Salto do Girao, Barra do Rio Madeira). 

 " Thrijophilui iilbipeelu.i sub;p." Hellmayr, Xnr. Zoo!, xiv. p. 345 (Humaytha). 



No. 686. (? ad., S. Isabel, Rio Preto, 12. x. 1907.— Wing 67 ; tail 48 ; 

 bill 19 mm. 



No. 460. 6 ad., Calama, 26. viii. 1907.— Wing 64 ; tail 48 mm. 



No. 872. ? ? juv., Marmellos, 27. xii. 1907.— Wing 61 ; tail 43 ; bill 

 16J mm. 



" Iris reddish brown (adulrj, greyish brown (872) ; feet and bill greyish black, 

 lower mandible grey.'' 



The specimens agree, in every detail, with a large series of T. albipectas, from 

 Para and Venezuela (Caura Valley), in the Munich Museum. Natterer's examples 

 from Barra do Rio Madeira and Manaos, as well as two adult males from the Upper 

 PuTus (Bom liUgar, Monte Verde), are rather <larker ochraceous below than the 

 majority of our Caura and Guianan skins, but some of the latter match them 

 exactly. The skins from Humavtha, S. Isabel, and Calama, on the other hand, 



