BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 
g'. Under parts not white. 
h. General color of under parts slate gray d'Dystlhamtms ardesiacus ar- 
h'. General color of under parts ochraceous buff (it may be 
clear or dusky). 
i. Upper parts bright hazel brown, or olive brown. 
j. Hazel brown above 9 Thamnopkihis doUatus. 
j'. Olive brown above 9 Dysitharnnus ardesiacus sai- 
i'. Upper parts slate color ^Pygipti'la stellaris. 
/'. Wing not more than 65 mm. 
g. Genera! color above gray (slate gray or olive gray). 
h. Middle of belly pale yellowish (fDysithamtuis affinis aixdrei. 
h'. Middleof belly pale grayish (whitish) d'Thamnophihis miirinus. 
g'. General color above olive or olive brown and crown and 
occiput tawny olive. 
h. Larger, tail g as long as wing or more; under parts 
pale buffy brownish 9 Thamnophilus murinus. 
h'. Smaller, tail less than | as long as wing; under parts 
pale grayish ; buffy yellowish on crissum 9 Dysilhamnus affinis andrei. 
e'. Wing coverts with distinct white or buffy tips, or other pale 
/. General color below white (immaculate) ; above black d'Taraha major albicrissa. 
/'. General color below not immaculate white. 
g. Head all round and throat black d^HyPolophus canadensis trin- 
g'. Sides of head and throat not black. 
h. General color of under parts a uniform gray (in shade 
varying from pale neutral gray to slate gray) . 
:. Tertials and inner secondaries edged or tipped, or 
both, with white or pale gray. 
j. Crown and occiput black. 
k. Primary coverts narrowly tipped with white .... Erionotus naevius naeintts. 
k'. Primary coverts not tipped with white Erionotus insignis. ' 
f. Crown and occiput slate gray or gray mixed with 
hazel brown ( cf im) cf and <f i»J- Erionotus cine- 
i'. Tertials and inner secondaries not tipped and edged 
(on outer webs) with white or pale grayish. 
j. Nearly uniform slate grayish above, no black on 
crown, wing-coverts with very small whitish apical 
spots d'Thamnophilus murinus. 
j'. Crown and nape black (and more or less black on 
the interscapulars) d'Pygiptila stellaris. 
h'. General color of under parts not uniform grayish. 
i. Chin, throat, and upper breast bright tawny ochrace- 
i'. Under parts in general a uniform pale buff or tawny 
ochraceous; or striated with white on a gray ground, 
or buffy brownish on a grayish white ground. 
j. Tail cinnamon brown. 
k. White tip to tail-feathers- confined to inner web 
except on two outermost rectrices (outer face 
of posterior half of tarsus with more or less oval 
scutes not closelj- joined to one another) 9 or <f (i w) Erionotus in- 
k'. White tips to rectrices larger and not confined to 
inner webs of quills (outer face of posterior half 
of tarsus with nearly quadrangular scutes unit- 
ing with those from the opposite side in a sharp 
ridge) 9 Erionotus naevius naevius. 
j'. Tail black or blackish brown. 
k. With an occipital crest; crown and occiput 
chestnut, sharply different in color from back.. . 9 Hypolophus canadensis irin- 
k'. No occipital crest . and color of crown and occiput 
not different from back. 
/. Slate gray (deep neutral gray) or slate black 
m. Smaller, wing less than 75 mm.; upper 
parts deep neutral gray d^.Sclateria argentata. 
m'. Larger, wing more than 75 mm.; upper 
parts slate black d'Sclaieria schistacea cauren- 
l'. General color above rufescent brown or mum- 
my brown. 
n do not know of any records in the immediate Orinoco valley, but there is a good series from Cristobal 
Colon. Paria Peninsula (American Museum Collection), and as the type comes from British Guiana the 
species is probably found in intermediate localities. 
