(267 ) 



The range of P. f. scmici nerea is as follows : — 



Lower Amazons: Para (Wallace, Layard, Suetblage), Prata near Para 

 (Hoffmanns) ; Itaituba, left bank of the E. Tapajoz (Hoffmanns, Snethlage) ; Eio 

 Madeira : Borba, Salto do Girao (Natterer), S. Isabel (Hoffmanns). 



19. 



Pachysylvia rubrifrons (Sil. & Salv.). 



Hylophibis riihrifrnns Sclater & Salvin, P.Z. S. Loivl. 1867. p. 569. tab. xx\. fig. 1 [1867.— " River 



Amazons (1850) " — Wallace coll.— sc. Rio Negro •]. 

 B.feryiigineifroiix (nee Sclater) Pelzeln, Zur Oniith. Braf. ii. 1868. p. 70 (Rio Negro below Santa 



Barbara ; Para).f 



No. 344. (? juv., Calaraa, 7. viii. 10U7. " Iris brown, feet and bill grey." — 

 Wing 57 ; tail 42 ; bill 13f mm. 



No. 1009. <S vi.\ ad., Blaruins, 13. vii. 1908. "Iris dark brown, feet pale 

 yellowish grey, bill black, below grey." — Wing 59 ; tail 42J ; bill 12Jt mm. 



No. 1023. Adult (not sexed), Marnins, 16. vii. 1908. "Iris brown, feet pale 

 gre}', bill grey." — Wing fjl ; tail 44 ; bill 13i mm. 



These specimens present very little variation i/ifrr .sr. I have compared 

 No. 344 with the tyjie in tlie British Museum, and found them identical except that 

 in the latter the throat and forcneck are somewhat darker, more buffy brownish, 

 less yellowish, and the back of a rather duller green. These slight divergencies are 

 certainly due to difference of age, for the type is a very young bird, this being 

 proved by the fluffy te.xtnre of the nape-feathers and the rusty sntfusion of the niidcr 

 tail-coverts. In fully or nearly adult birds (Nos. 1023, 1009) the latter are clear 

 yellow, the back is rather brighter green, and the throat buffy yellow. 



The figure in the -P. Z. S. 1867 is wholly misleading : throat and foreneck 

 being represented as pale ferruginous, while they are buffy brownish in the type, 

 the wings being far too rnfous, etc. 



P. rubrifrons is most nearly related to P. luteifrons (Scl.), from British 

 Guiana and Cayenne, bnt differs in having the frontal and sujjraloral stripe deeja 

 cinnamon-rufous (not dingy ochraceous buff), the upper parts of a clearer greeu 

 (without any brownish shade), the cheeks and car-coverts decidedly isabelline 

 (instead of greyish olive), the tail much brighter russet-brown, the throat muck 

 more tinged with buff, etc. 



/'. Jcmiijineifrons (>Scl.), from Bogota and V'cueiiuela, also bears a certain 

 likeness to P. rubrifrons, but may readily be distinguished by its duller, rnfescent 

 brown tail, greyish olive cheeks and ear-coverts, whitish throat, greyish white (not 

 yellowish) belly, and especially by the rufous colour of the forehead being ranch 

 duller and continued over the crown. 



The range of P. rubrifrons, as known at jjresent, is as follows : — 

 North Brazil : Rio Negro (Wallace), below Santa Barbara, Rio Negro 

 (Natterer). Rio Jfadeira \ : Oalama ; Marnins on the Rio Machados (Hoffmanns). 

 Para (Natterer, Snethlage). 



* The type was certainl.v obtained on the Rio Segro, for we learn from Travels on tlie Amazons aiil. 

 liio Negro, 1853, p. 163, that Mr. Wallace arriveSatthe cit.v of Barra do Rio Xegro on December 31, 1R49, 

 and spent all the year 1S50 in explorations on that river. 



t Although the specimens are no longer to be found in the Vienna Museum, there can be scarcely any 

 dnnht that they are rather referable to P. riihrifrons, for it is this species that was obtained hy 

 Mr. Wallace on the Rio Negro, and more recently by Miss Snethlage in the vicinity of Tarit. 



X Farther to the west, on the Rio Junia, however, P. femginnfrom (Scl.) is found. A specimen in 

 the Museu Paulista, kindly sent for my inspection by Professor H. v. Ihering, agrees perfectly with the 

 series from BogotA and the Caura Valley in the Munich Museum. 



