154 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 



Only four species of North American warblers are found in the 

 valley of the Orinoco, the Black-poll, Yellow Warbler, Redstart, and 

 the "Water-Thrush." The Yellow Warbler and Black-poll are not 

 uncommon from October to early May. The "Water-Thrush" is found 

 during the same months but is much less common. Redstarts I only 

 observed during April and the first week in May. 



Seiurus novEboracensis noveboracensis (Gmelin). 

 Motacilla noveboracensis Gm. Syst. Nat. 1788. p. 958. 

 Seiurus noveboracensis Berlepsch & Hartert, p. 10. 



Not uncommon. The sight of a "Water-Thrush" daintily bowing 

 from left to right as he wandered along the shore of some stream or 

 pond was as cheering as seeing the face of an old friend from home. 



VIREONIDAE— THE VIREOS. PACHYSYLVIAS AND PEPPER- 

 SHRIKES. 

 Some eight or nine members of this family are to be found in the 

 Orinoco Region, but of this number the writer has collected only four. 

 Berlepsch and Hartert in their paper include seven species of which 

 they had specimens. I am now able to add Pachysylvia aurantiifrons 

 saturata of the- northern coast of Venezuela and Trinidad, based on 

 specimens from the delta while P. brnnneiceps, P. Jiypoxantha, P. 

 semicinerea Vircosylva calidris calidris and Vireosylva olivacca enter 

 the region from the upper Orinoco. 



Key to the Species and Subspecies of Vireonidae. 



a. Outermost primary (tenth) obsolete, and wing rather long and pointed. 



b. With a dusky or blackish submalar streak I 'ireosylva calidris calidris. 



h'. Without dusky or blackish submalar streak. 



c. Sides and flanks strongly washed with olive yellow, under tail-coverts 



sulphur yellow, wing less than 75 Vireosylva chivi agilis. 



c'. Sides and flanks only faintly washed with olive yellow, under tail- 



covetts pale yellowish or white, wing more than 75 Vireosylva olivace.a. 



a'. Outermost primary (tenth) about half as long as the ninth, and wing short 

 and rounded. 

 b. Bill slender and but slightly decurved terminally; wing less than 6s 

 mm. long. 



c. A distinct olive yellow jugular band Pachysylvia thoracicus grise- 



iveniris. 

 c'. Without olive yellow jugular band. 



d. General color of under parts yellow Pachysylvia aurantiifrons 



saturata. 

 d'. General color below not yellow. 



e. Forehead, crown and tail strongly rufous Pachysylvia ferrugineifrons. 



e'. No rufous on tail. 



/. General color of under parts buffy brownish Pachysylvia flaviprs acuii- 



cauda. 



