272 BROOKLYN INSTITUTE MUSEUM. SCIENCE) BULLETIN 2. 6. 



g'. Under parts not white. 



h. General color of under parts slate gray . 



h'. General color of under parts ochraceous buff (it may be 



clear or dusky). 

 . Upper parts bright hazel brown, or olive brown. 



j. Hazel brown above 



j'. Olive brown above 



'. Upper parts slate color 



/'. Wing not more than 65 mm. 



g. General color above gray (slate gray or olive gray) . 



h. Middleof belly pale yellowish 



h'. Middle of belly pale grayish (whitish) 



g'. General color above olive or olive brown and crown and 



occiput tawny olive. 

 h. Larger, tail as long as wing or more; under parts 



pale buffy brownish 



h'. Smaller, tail less than J as long as wing; under parts 



pale grayish ; buffy yellowish on crissum 



'. Wing coverts with distinct white or buffy tips, or other pale 

 wing markings. 



/. General color below white (immaculate) ; above black 



/'. General color below not immaculate white. 



g. Head all round and throat black 



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) . 

 j. 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 .... 



k'. Primary coverts not tipped with white 



j'. Crown and occiput slate gray or gray mixed with 

 hazel brown ( cf im) 



*'. 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 



j'. Crown and nape black (and more or less black on 



the interscapulars) 



h'. General color of under parts not uniform grayish, 

 j. Chin, throat, and upper breast bright tawny ochrace- 



tfDysithamnus ardesiacus ar- 

 desiacus. 



9 Thamnophilus doliatus. 



9 Dysilhamnus ardesiacus sat- 



urninus. 

 tfPygiptila stellar is. 



tfDysithamnus affinis andrei. 

 ^Thamnophilus murinus. 



9 Thamnophilus murinus. 

 9 Dysithamnus affinis andrei. 



tfTaraba major albicrissa. 



tfHvpolophus canadensis trin- 

 iiatis. 



Erionotus naevius naevius. 

 Erionotus insignis. 1 



d" and cf im. Erionotus cine- 

 reiceps. 



^Thamnophilus murinus. 

 stellaris. 



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 closely joined to one another) 



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) 



f. Tail black or blackish brown. 



k. With an occipital crest; crown and occiput 

 chestnut, sharply different in color from back. . . 



k'. No occipital crest, and color of crown and occiput 



not different from back. 

 I. Slate gray (deep neutral gray) or slate black 



above. 

 m. Smaller, wing less than 75 mm.; upper 



parts deep neutral gray 



m'. Larger, wing more than 75 mm.; upper 

 parts slate black 



I'. General color above rufescent brown or mum- 

 my brown. 



9 Thamnophilus amazonicus. 



9 or cf (im) Erionotus in- 

 signis. 



9 Erionotus naevius naevius. 



9 Hypolophus canadensis trin- 

 itatis. 



tfSdateria argentata. 

 tfSdateria schistacea cauren- 



U do not know of any records in the immediate Orinoco valley, but there is a good series from Cristobal 

 Colon, Pana Peninsula (American Museum Collection), and as the type comes from British Guiana the 

 species is probably found in intermediate localities. 



