( 7 ) 



etiam pallidiore, minus bninnescente. Habitat in regione flnminis Orinoco centialis. 

 Ti/pus in Mus. Tring, S Altagracia, G. i. 1898, no. 9550. 



There is no doubt, in our opinion, that the name Thr. albipecfus must be 

 accepted for the form inhabiting the coast regions of Cayenne and (xuiana, and that 

 Lafresnaye's name T. Ifnrotis [h'i'r. Zool. 1845 p. 338 — " Colombia ant Mexico" !] 

 belongs to a different form. Tiie description " snpra griseo-mnrinns " \_Lf.~\ does 

 not at all agree witli the birds we call (ilhijjectus. Thr. leucotis proper is evidently 

 a mountain form from Colombia, which is not rare in Bogotii collections (Mus. Tring 

 and Berlepsch), but before tlie type of Lafresnaye is studied it will be somewhat 

 difficult to apply his name correctly. 



The distribntion of Thr. alhipectus and its allies is most interesting, but at 

 present somewhat puzzling. The typical (dhi pectus in our sense inhabits the coast- 

 region of Cayenne and Britisli Uuiana (<Juonga, Annai, Whitely coll., in Mns. 

 Berlepsch and Mus. Britann.). Berlepsch and Hellmayr have examined entirely 

 similar examples from the IJio Negro and Rio Branco, and Hartert has before him 

 a dozen specimens from Nicare and La Pricion on the npper Canra River 

 (collected by Mr. E. Andre of Trinidad), and one female from Snapure on the 

 Caura River (Klages coll., Mus. Tring), which agree fully with typical albipectits. 

 There are also occasionally specimens fonnd in Bogotii collections, which are very 

 much like typical alhipertas, but their exact locality is of course not known. 



From typical alhipectus our large series of Thr. alhipectus hi/poleucus from the 

 middle course of the Orinoco differ at a glance by their nearly uniform white 

 underside, the flanks and under tail-coverts only being suffused with rufescent- 

 olivaceous. The npper surface is also paler, not so deep rufous-brown. In some 

 specimens there is a very slight rufescent suffusion on the breast. A quite young 

 bird (Altagracia, 12. xi. 1897, S , No. 8593, Cherrie coll.), has the breast and 

 abdomen as whitish as adult birds. We have the following specimens before us : — 



Altagracia: t? 6. i. (type), cjc? 11. xi., (?;? 4. xi., c? 7. i., SS juv. 12. xi. 

 (somewhat more rufous on the abdomen, but very slightly so), ? ? ad. 4. xi. (very 

 much worn), ¥ 28. xii. (in moult) (all Cherrie coll.). 



Caicara : ? ¥ 7. v., ? 17. iii., S 21. ii. (Cherrie coll.). 



Quiribana de Caicara : ¥ 5. iv. (Cherrie coll.). 



Ciudad Bolivar : 3 ? May, December (Klages coll.). 



Mr. Cherrie marks the iris as " mummy brown ; feet plumbeous ; bill blackish 

 above, slaty below." 



The wings of our males measure 00^, GO, G5^, 04 mm.; tails 48J, 48, 47J, 

 45^ mm.; culm. 18J, 18^, 17i, IGi mm. ; metatarsus 23J, 23, 23, 22J mm. ¥ ¥ : 

 wing, G2, 60J, GO, GOi mm.; tail, 40i, 4G, 44, 45 mm. ; culmen 17], IGi, IGf, 

 16| mm. ; metatarsus, 22),, 21. f, 2U mm. 



(Nos. 8459, 8460, 8461, 8508, 8593, 8594, 8725, 9294, 9436, 9437, 9438, 9550, 

 9570,9655,9701, 9789, 9923, 10195, 10510, 10516, 10612, 10900, 109oO, Cherrie 

 coll.) 



16. Thryothorus griseipectus caurensis subsp. nov. 



[Thryothorus griseipeclus Sharpe, Cat. B. Brit. Mus., vi. 1881 p. 236 (Naiita, Peruvian Amazons).] 



Thryothorus, T. griseipeclus dicto simillimus, sed corporis lateribus minus 

 rufescentibus, pileo obscuriore, rostro inferiore nigrescentiore distinguendus. 



The specimens from the Canra River are very closely allied to typical 

 Thr. griseipectus, but the abdomen is greyish white, or whitish grey, only the 



