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Valley, Venezuela, and the throat pure white like adult birds of the form just 
mentioned. There is, however, one character which serves to distingaish readily 
the Madeira form from P. s. griseiceps, that is, the mach paler and clearer, greenish 
olive-brown (instead of rufescent or deep russet-brown) colour of the back. The 
immature birds, the type from Salto do Girao and the 3 from Calama, differ by 
having the throat and lores washed with pale sulphur-yellowish, the cap much 
paler slate-grey, tinged with olivaceous, the sides of the head clear olive-grey, the 
back decidedly lighter brown, and the belly paler ochraceous. The greater upper 
wing-coverts and the quills show narrow, rufescent apical margins. 
The following condensed review of the geographical races of the P. senex 
group may be useful to students of the neotropical ornis. 
(a) Platyrinchus senex senex Scl. & Salv. 
Platyrhynchus senex Sclater & Salvin, Proc. Zool, Soc. Lond. 1880, p. 156 (Sarayagu, Eastern 
Ecuador) ; Taczanowski, P. Z. S. Lond. 1882. p. 18 (Yurimaguas, N. Peru ; descr, 9 ad.) ; 
idem, Orn. Pérou ii, 1884, p. 224 (Yurimaguas) ; Sclater, Cat. Birds Brit. Mus, xiv. 1888. p. 65 
(Sarayacu ; Chamicuros, N. Peru). 
Hab. Eastern Ecuador: Sarayacu (Buckley), North Peru: Yurimaguas 
(Stolzmann), Chamicuros (Mus. Brit.). 
Type locality : Sarayacu, Eastern Ecuador. 
Specimens examined : 
Wing. Tail. Bill. 
1. Mas. Brit. Adult (not sexed), Sarayacu .| Typesof 62 32 12 mm. 
LS 4 eee ¥ .) species 65 33 123 ,, 
°° OS", ee ==» emmacures 68 37 ins 
Adult. Top of the head slaty blackish with a half-concealed white coronal 
patch; back deep rafescent brown ;* sides of the head very dark slate-grey. 
Throat white, rest of under surface deep ochraceous. 
Obs. From the scanty material at hand it is difficult to say whether this form is 
really distinct from P. s. griseiceps. Nos. 2 and 3 have the cap decidedly darker, 
more blackish, than any specimens of the latter race, but No. 1 approaches it very 
closely in that respect. Other differences do not exist, for the colour of the back 
and belly, upon which Salvin, when describing P. griseiceps, laid much stress, 
proves to be variable. None of the specimens seen by me being sexed, I cannot 
say whether the sexes are alike or not, bat probably the female has less white on 
the crown as is the case in the allied forms. 
(6) Platyrinchus senex griserceps Salv. 
Platyrhynchus griseiceps Salvin, Bull. B. O. C. no. xlviii. p. xv. (Nov. 1897.—“ Aunai,t British 
---QGuiana”); Berlepsch & Hartert, Nov. Zool. ix. 1902. p. 37 (Caura, Venezuela). 
P-rostatus (nec Latham) Pelzeln, Zur Ornith. Bras. ii. 1868. p. 100 (part. : Serra Carauman, Rio 
Branco). 
P. senex (nec Sclater & Salvin) Hartert & Hellmayr, Bull, B. 0. C. xii, 1902. p. 64 (Serra 
Carauman). 
Had. British Guiana : Ourumee (H. Whitely, jun.). Surinam: near Paramaribo 
(Chunkoo). N.E. Brazil: Serra Carauman, on the Rio Branco (Natterer). East 
Venezuela, Caura Valley : Suapure (Klages), Nicare, La Pricion (E, André), 
* The term “ yellowish olive” used by Dr. Sclater (.c. p. 65) is altogether misleading. 
+ This is a mistake, the type being from Ourumee, 
