: ORNITHOLOGY Of THE ORINOCO REGION. 15! 



MNIOTILTIDAE THE WARBLERS. 



The author has collected seven species of Warblers on the Ori- 

 noco, four of which number were North American migrants. One 

 other species (Basileuterus mesoleucus) was included in Berlepsch and 

 Hartert's paper and was collected by Klages at Suapure on the Caura 

 River. Now I am able to add Basileuterus auricapillus olivascens based 

 on a specimen collected by Mr. C. William Beebe at Guanoco in the 

 delta region and Oporornis agilis collected by L. E. Miller at Maipures. 



In the following key I have included some other species and sub- 

 species that are recorded from various points in British Guiana that 

 not improbably may be later found to enter the Orinoco valley. 



KEY TO THE SPECIES AND SUBSPECIES OF MNIOTILTIDAE. 



a. Having a distinct superciliary stripe and breast not red. 



b. Breast and sides streaked with dusky or blackish Seiurus noveboracensis. 



b'. No streaks on breast and sides. 



c. Throat, breast and belly white Basileulerus mesoleucus. 



c'. Throat, breast and belly yellow Basileuterus auricapillus 



olivascens. 

 a'. No distinct superciliary stripe; or, if present, then centre of breast and 



belly vermilion (geranium red). 

 b. Throat white, whitish grey or black, and sides and breast not streaked. 



c. Centre of breast and belly red, sides and flanks grey Granatellus pelzelni. 



<^. Centre of breast and belly not red. 



d. Centre of breast and belly white or whitish, sides of breast yellow- 

 ish or reddish pink ; Setophaga ruticilla. 



d'. Belly yellow, throat and upper breast slate grey or pale grayish 



brown Oporornis agilis. 



b'. Throat yellow, or, sides and flanks streaked with blackish. 



c. Under tail-coverts of the same general color as other under parts. 

 d. Inner webs of outer tail-feathers marked with yellow or white. 



e. Under parts white with dusky or blackish streaks on sides Dendroica striata. 



e'. Under parts yellow, wither without russet or brownish streaks. Dendroica aestiva. 



d'. No markings on inner webs of outer tail-feathers Geothlypis aequinoclialis. 



c'. Under tail-coverts white in sharp contrast to the yellow breast. 



d. Above slate grey with olive green triangular patch in centre of 



back Compsothlypis piliayumi 



elegans. 

 d'. Above, head yellow shading into olive green on back, rump slate 



grey Protonolaria citrea. l 



COMPSOTHLYPIS PITIAYUMI ELEGANS Todd. 



Sylvia pitiayumi Vieillot, Nouv. Diet. d'Hist. Nat. XL 1817. p. 276. 

 Parula pitiayumi Berlepsch & Hartert, p. 10. 



C[ompsothlypis] p[itiayumi] pitiayumi Ridgw. Auk. XIX. 1902. p. 69 in 

 text. 



'Chapman, Bull. Am. Mus. VI: 1804: 24, included the Prothonotary Warbler in his list of the birds of 

 Trinidad. Future collecting may discover it in the delta region of the Orinoco. 



