142 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6'. 



the head and mottled with a wash of wood brown. The wings and 

 tail are black, tips and outer edges of primaries and alula white. Ter- 

 tials, secondaries and coverts are tipped and edged with pale buffy 

 wood brown. Outer edges of outer pair and tips of five outer rec- 

 trices white. Below dull white washed with buff and spotted with 

 dusky brown except on crissum and belly. Postocular and malar 

 streaks and auriculars grayish white. Lores and subocular streak 

 blackish. A faintly indicated dusky sub-malar streak. 



DONACOBIUS ATRICAPILLUS ATRiCAPiLLUS (Linnaeus). 

 Turdus atricapillus Linn., Syst. Nat: ed. 12. I. 1766. p. 295. ("Cap 



Bon Spei" Berlepsch & Hartert substitute E. Brazil.) 

 Donacobius atricapillus Berlepsch & Hartert, p. 4. 



Klages sent a specimen that he collected on the Mato River, one 

 of the small tributaries of the Caura River, to the Tring Museum; and 

 Mr. Beebe collected and noted this species as abundant in the delta 

 at Guanoco. 



TROGLODYTIDAE THE WRENS. 



Five genera are represented in the Orinoco region including six 

 species and four subspecies. All are notable as songsters and char- 

 acteristic birds of the regions that they frequent. 



KEY TO GENERA, SPECIES AND SUBSPECIES OF TROGLODYTIDAE. 



a. Tail equal to or longer than wing Heleodytes. 



b. Under parts white without spots or markings. 



c. Upper parts greyish brown with scarcely a trace of umber, smaller. . . H. griseus. 

 c'. Upper parts strongly raw umber brown or washed with brown (be- 

 tween a raw umber and mummy), larger H. minor. 



b'. Under parts white with breast, sides, flanks and under tail-coverts 



spotted with blackish H. nuchalis. 



a'. Tail shorter than wing. 



b. Chin and throat pale and without dusky or blackish cross bars. 



c. Feathers on sides of neck mottled black and white, the centres being 



white, edges black Leucolepis musicus. ' 



c 1 . Feathers on sides of neck not black and white mottled. 



d. Nostrils rounded, at forward end of the nasal fossa Thryophilus. 



e. Throat white, remainder of under parts buff, on sides, 

 flanks and under tail-coverts becoming ochraceous. (On 

 the Caura River, the Cuchivero River and probably other 

 tributaries of the Orinoco, entering that stream from the 

 Guiana side) T. albipectus albipectus. 



'This wren so far as known is found only in British Guiana, but it is not improbable that it may 

 be taken in the delta region of the Orinoco. 



