ago FIELD MUSEUM or NATURAL HISTORY ORNITHOLOGY, VOL. I. 



darker; the color of the upper parts deep rufous chestnut; throat and 

 breast rufous chestnut ; the chin paler, flanks more strongly tinged with 

 orange brown; rump, wings and tail similar to rufipectus, but wing 

 coverts orange brown; rump, wings and tail similar to rufipectus, 

 but wing coverts tipped with darker rufous; upper mandible brownish 

 black. 



Length (skin), 168 mm.; wing, 77; tail, 74; culmen, 20; tarsus, 23. 



Thamnophilus doliatus dearborn! subsp. nov. 



Type from Encontrados, Zulia, Venezuela. Adult male, No. 

 43564, Field Museum of Natural History. Collected by N. Dearborn, 

 February 19, 1908. 



Similar to T. doliatus doliatus, but general color much blacker, the 

 white markings narrower and less numerous, and on the tail feathers 

 fewer and smaller. 



Wing, 74; tail, 67; culmen, 19; tarsus, 27. 



Adult female, No. 43565, Field Museum of Natural History, Encon- 

 trados, Zulia, Venezuela. Collected by N. Dearborn, February 12, 

 1908. 



Upper parts rufous chestnut, decidedly darker and less ferrugineous 

 than in the female of T. doliatus doliatus; crown darker than back and 

 more chestnut; black stripes on side of head broader and on throat 

 heavier and more confluent; under wing coverts darker than in T. 

 doliatus doliatus and spotted with black ; tail darker ; under parts decided- 

 ly darker and deeper rufous, palest on the belly. 



Wing, 73; tail, 65; culmen, 19; tarsus, 27. 



Apparently a well marked dark form inhabiting the low country in 

 the vicinity of the lower Catatumbo River. I have dedicated this well 

 marked subspecies to Dr. 'N. Dearborn, who collected a number of the 

 new birds described in this paper. 



Dendrocincla tyrannina hellmayri subsp. nov. 



Type from Paramo de Tama, Colombia (headwaters of Tachira 

 River near the Venezuela line). Adult male, No. 44185, Field Museum 

 of Natural History. Collected by W. H. Osgood, February 14, 1911. 



Similar to D. tyrannina tyrannina, but general color somewhat more 

 olivaceous (less rufous), most noticeable on the upper parts; blackish 

 edgings on feathers of forehead heavier and more distinct. 



Length (skin), 260 mm.; wing, 125; tail, 115; culmen, 27; tarsus, 27. 



I have dedicated this new form to Dr. E. C. Hellmayr. 



