(2) 



The following account is divided into two chapters, the first dealing with the 

 birds from Santarem, the second with those obtained at Obidos. As in my former 

 papers on neotropical birds which appeared in this periodical, I have quoted only 

 the original descriptions and such references as strictly pertain to the fauna! district 

 in question. 



I. BIRDS FROM SANTAREM. 



1. Turdus fumigatus Licht. 



Cfr. Nov. Zool ziii. (1906) p. 353. 



Morula fumigaia, Chapman & Riker, Auk 18110. p. 135 (Santarem). 



No. 423. ? ad., Itaituba, 10. i. 06. " Iris brown, bill black." 



Like the one previously seut from Prata, Para, this specimen has a large white 



patch in the anal region, otherwise it agrees with ordinary T. fumigatus of East 



Brazil. 



2. Troglodytes musculus clarus Berl. & Hart. 

 Of. Nov. Zool. xii. (1905) p. 270. 



No. 559. ? ad., Urncuritnba, 9. ii. 06. " Iris brown." 

 Identical with specimens from Para and British Guiana. 



3. Thryophilus albipectus albipectus (Cab.) 



Thryoihoru* albipeetut Cabania in Schoniburgk, Reisen Brit. Guiana iii. (1848), p. 073 (Cayenne). 

 Thryophilui taettioptera Ridgway, Pror. I'.S. Mus. x. 1887 (publ. 1888) p. 518 (Diamautiua, 

 Santarem). 



No. 460. cT ad., Itaituba, 18. i. 06. "Iris brown."— Wing 65, tail 46, bill 

 19i mm. 



This specimen, which tallies well with Ridgway's description, belongs certainly 

 to the same form as a large series from British Guiana, Rio Branco and the 

 ('ama River, Venezuela, which I had previously compared with Cabanis' type of 

 T. albipectus in the Berlin Museum. There is no appreciable difference in the colour 

 of the npper surface, and the lower parts in No. 460 are exactly as in a specimen 

 from the C'aura, throat and middle of the breast being white, foreneck and sides 

 buff, deepening into pale brownish on Banks ; the under tail-coverts tawny. Mr. 

 Ridgway describes T. taenioptera as having narrow dusky bars on the back ; while 

 our specimen from Santarem has no trace of these markings. This discrepancy, 

 however, seems of very little importance in view of the great variability of that 

 character shown by our C'aura series (12 skins). 



The S ad. from Barra do Rio Madeira, mentioned in Verkandl. Zool. Botan. 

 Gesellsch. Wien 1901, p. 769, as probably belonging to the form found in North- 

 east Pern, proves to be only an extreme, dark-coloured specimen of '/'.</. albipectus ; 

 there are several similar examples in the series from the C'aura River. On the 

 other hand, skins from Pern apparently represent a distinct race, differing from 

 '/'. a. albipectus by their shorter tail, slightly shorter bill, and much darker ochraceous 

 under parts, the throat alone being whitish. 



What I said (/.<•) about the geographical races of T. albipectus requires, 

 therefore, some modifications. Having examined much additional material, it 

 seems to me that the following forms ought to be recognised : — 



