( 8 ) 



sides Ileitis washed with nifons 1)rowii, wliilc in typical Thr. qrisripcctus the sides 

 are chestiint nifoiis, and the greyisli white urea in the middle of the abdomen is 

 more restricted. The nuder tail-coverts in the Canra birds are also mostly less 

 rnfons, more brownish, uniform in some, move or less barred in others. The under 

 mandible appears ipiite whitish in all the Nauta specimens, slaty or blackish grey 

 iu those from the Panra. In the skins there is no marked difference in tiie 

 colour of the npper and under mandibles, while in the Nauta skins the upper 

 mandible looks blackish, the lower one whitish. The crown is darker, more 

 blackish brown, in the f'anra skins. In the majority of sjieciraens the ear-coverts 

 are also more strijied with wliite, and the back is darker rufous, but these two 

 characters are not evident in all individuals. 



From Thr. amazoniais Sharpe our T/ir. gris. caiirenxiii differs at a glance by 

 tlie greyish, not rusty fulvous abdomen, more greyish chest and smaller bill. 



Hartert lias com|iared the type and a co-type (the latter in tlie Tring Museum) 

 of Thr. nimtzonieus and a series of eight T/ir. yr>!«'ipi'ctMS, all from Nauta. He, 

 however, is not quite certain, that Tlir. umazonicus (with a fulvescent chest) is 

 different from Tlir. ffriscijiccfiii^, which, like our caureyi.v.s, has a greyish chest. 

 Thr. (/eniharbif: and its allies can easily be distingnished by the sharply defined 

 white malar stripe which is separated fmin tlie throat by a black line. 



Hub. ('aura River, type 3 Nicara, VZ. i. UiUl. 



La Union, Canra R. : S ad. 18. xii. 1900 (E. Andre.) 



La Pricion, ('aura R. : 2 December, February, 1900, 19(il. (E. Andre.) 



Nicare, Canra R.: J ? , IL', 18. i. 1001. (E.Andre.) 



" Iris brown, npjier mandible black, tip of lower black, rest silvery gre}', feet 

 dark slate. 



" Iris brown, upper mandible black, lower dark grey, feet greyish-brown." 



IT. Troglodytes musculus clarus uom. nov. 



[Troglodytes musculus Naumann, Vdg. Dnitschl. iii. (1823) p. 724 (table) (Bahia !).] 

 ' T. rufulus aut., nee Cab., ex Guiana ! 

 T.furvus aut., ex Guiana. 



Altagracia : c? J ? 22. xi., S 20. xi., 3 c?(? 2. xii., S 6. i., S ? 30. xi., J 17. xi., 

 6 16. xi., cJ :. i., ? 9. ii., ? 26. xi. (Cherrie). 



Cindad Bolivar : S ? 25. vi. ; Suapure : ? 22. vi., S 26. \-ii. (Klages). " Iris 

 dnsky brown, seal-brown, dark sepia ; feet dusky slate, or plumbeous ; bill 

 blackish above, slaty below " (t!herrie). 



La Pricion : Canra R. c? xii. 190O. (E. Andre.) 



(Nos. 8469, 8528, 8668, 8680, 8756, 8786, 8787, 8861, 8943, 8944, 8973, 8974, 

 8975, 9125, 9405, 9549, 9563, 9083 Cherrie coll.) 



T. m. rhiriis is a new name jiroposed for the j)ale form of T. ?n!/sciili/.'i in- 

 habiting British Guiana and the Orinoco region of Venezuela and perhaps Trinidad 

 too {ti/pe: in Mus. Berlepsch, Bartica Grove, Brit. Guiana ad. 27 November 1879, 

 no. 8578). This form lias been sometimes called T. fiirrus (Gm.), or T. rufulus Cab. 

 Regarding T. furrus Gm. (based on the Brown Warbler of Brown's Illustr. ZooL, 

 described and figured witlioiit indication of hiibitat) we agree with Mr. Widmer Stone 

 {Pr. Ac. N. Sr. Philad. 1899, j). 310) that it cannot be identified satisfactorily, but 

 regarding T. rufulus Cab. it seems that Mr. W. Stone has overlooked altogether 

 the remarks on that sjiecies of Mr. Salvin in the Ibia, 1885, p. 201. T. rufuluaVah., 

 known to us from specimens collected on the Roraiuia by Mr. H. Whitely, is quite 



