CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. I5I 
MXIOTILTIDAE— 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 (Basilciitcncs mesoleticus) 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 .\xd Subspecies of Mniotiltid.\e. 
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 Basileuterus mesoleucus. 
c'. Throat, breast and belly yellow Basileuterus auricapillus 
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 Craualrlhis pelzdni. 
(f. Centre of breast and belly not red. 
i. Centre of breast and belly white or whitish, sides of breast yellow- 
ish or reddish pink ^etophaga ritlicilla. 
d'. Belly yellow, throat and upper breast slate grey or pale grayish 
brown Oporornis agtUs. 
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, with or without russet or brownish streaks. Dendroica aestiva. 
d'. No markings on inner webs of outer tail-feathers. . . . : Geothlypis aequinoctialis. 
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 Compsothhpis pitiayutni 
elegans. 
d . .■\bove. head yellow shading into olive green on back, rump slate 
grey Prolonotaria cilrea. ' 
COMPSOTHLYPIS PITIAYUMI ELEGANS Todd. 
Sylvia pitiayumi Vieillot, Xouv. Diet. d'Hist. Nat. XI. 1817. p. 276. 
Panda pitiayumi Berlepsch & Hartert. p. 10. 
C[ompsotlilypis] p[itiayHiiii] pitiayumi Ridgw. Auk. XIX. 1902. p. 6g in 
te.xt. 
'Chapman. Bii». ,4m. .Unt. VI: 1S04: 24, included theProthonotary Warbler in his list of the birds of 
Trinidad. Future collecting may discover it in the delta region of the Orinoco. 
