Todd — New South American Birds. 73 



Cercomacra tyrannina laeta, subsp. nov. 



Adult male very similar to that of Cercomacra tyrannina tyrannina of 

 the Bogota region of Colombia, but the wings and tail generally duller 

 and more brownish. Adult female constantly paler and more uniform 

 below than in tyrannina, with less brownish wash on the sides and flanks. 



Judging from the diagnoses, this form cannot be the same as the races 

 recently described from British Guiana and western Ecuador, respectively 

 (cf. Chubb, Bulletin British Ornithologists' Club, vol. 38, 1918, 85). 



Type, No. 69,242, Collection Carnegie Museum, adult female; Benevides, 

 Para, Brazil, September 5, 1918; Samuel M. Klages. 



Myrmopagis paraensis, sp. nov. 



Adult male: above plain slate gray, the sides of the head with some 

 whitish mottling or streaking; scapulars white, the longer ones slate 

 gray, externally margined with white, bordering a streak of black; lesser 

 and middle coverts white, tipped with black; greater coverts similar, 

 but more or less slate gray medially ; remiges dusky, externally slate gray, 

 with whitish inner margins, and the two outermost primaries with narrow 

 white outer margins; tail black, the feathers edged with slate color, the 

 middle rectrices entirely slate color ; all the rectrices narrowly tipped with 

 white; throat and middle of the breast black; sides of the breast plain 

 slate gray like the back; rest of the under parts plain light gray (gull gray), 

 fading to nearly white on the crissum ; under wing-coverts similar, mottled 

 with black toward the outer edge; bill and feet black (in skin). Wing 

 (type), 62; tail, 32; exposed culmen, 11.5; tarsus, 15. 



Female: above, including external margins of wings and tail, light 

 brownish olive ; tips of wing-coverts paler (isabella color) ; inner margins 

 of remiges whitish; tail-feathers with slight buffy terminal spots; sides of 

 head and entire under surface plain deep cinnamon buff, the sides and 

 flanks with darker shading; under wing-coverts also deep cinnamon buff; 

 bill black above, pale below; feet black (in skin). 



This is the Myrmotherula longipennis of Hellmayr, Novitates Zoologicae 

 XII, 1905, p. 286; XIII, 1906, p. 369, etc.; also of von Ihering, Revista 

 Museu Paulista, VI, 1904, p. 441, pi. 15, fig. 2, which is an excellent 

 representation. M. longipennis, however, as shown by the series con- 

 sulted in this connection, has a very differently colored female from the 

 present form, although the males are similar. M. iheringi Snethlage 

 (Ornithologische Monatsberichte, XXII, 1914, p. 41) cannot be the same 

 if the description is correct. 



Type, No. 69,244, Collection Carnegie Museum, adult male; Benevides, 

 Para, Brazil, September 5, 1918; Samuel M. Klages. 



Formicarius ruficeps orinocensis, subsp. nov. 



Similar to Formicarius ruficeps amazonicus Hellmayr, but decidedly 

 more brownish (nearest raw umber), less olivaceous above, and on the 

 wings and tail; pileum obviously darker (chestnut instead of Sanford's 



