110 Ridgway New American Sir ds. 



with greenish blue; adult female similar to that of P. c. ccesiogaster but 

 upperparts duller slate-gray and underparts white medially. 



Southeastern Mexico (States of Oaxaca and Chiapas). 



Type, No. 142,695, Coll. U. S. Nat. Mus. (Biological Survey Collection), 

 adult male, Oaxaca City, Oaxaca, June 21, 1894; Nelson and Goldman. 



Polioptila bairdi, new species. 



Similar to P. albiloris but smaller, and with lores not entirely white, 

 but crossed with a black line (in adult male) from rictus to anterior 

 angle of eye. ; 



Western Nicaragua and Costa Rica. 



Type, No. 89,693, Coll. U. S. Nat. Mus., adult male, San Juan del Sur, 

 Nicaragua, January 6, 1883; C. C. Nutting. 



Polioptila superciliaris magna, new subspecies. 



Similar to P. s. superciliaris but decidedly larger (except length* of 

 tarsus), the wing much longer; coloration darker, the pilcum, in adult 

 female (adult male not seen!) nearly slate-black, the underparts pale 

 gray (between french gray and cinereous), only the abdomen, hinder 

 flanks, anal region and under tail-coverts being white. 



Adult female. Wing, 47.5; tail, 43; exposed culmen, 12.5 mm. 



Highlands of central Costa Rica. 



Type, No.. 189,563, Coll. U. S. Nat. Mus., adult female, Cartago, Costa 

 Rica, April, 1886; J, J. Cooper. 



Telmatodytes palustris iliacus, new subspecies. 



Similar to T. p. palustris but paler and much more refescent, the 

 flanks and anal region conspicuously tawny bun* or buffy cinnamon. 



Mississippi Valley and Great Plains region, north to Alberta, east to 

 Indiana, south in migration over greater part of Mexico (except north 

 western portion) and along Gulf coast to western Florida, occasionally to 

 middle and southern Atlantic coast. 



Type, No. 90,199, Coll. U. S. Nat. Mus., adult male, Wh,eatland, Knox 

 County, Indiana, April 30, 1883; R. Ridgway. 



This form equals T. p. dissceptus Bangs in part; but the type of the 

 latter, now before me, is from Wayland, Massachusetts, and, together 

 with a large series from the same portion of the country, seems to me 

 inseparable from T. p. palustris. 



