456 U.S. NATIONAL MUSEUM BULLETIN 221 



This race was based upon a series of six specimens, each of which was 

 treated by Ridgway as a cotype. Grinnell {loc. cit.) has shown, however, 

 that Ridgway's material embraced two forms, and by restricting Ridgway's 

 name to the population of Cape San Lucas, has left No. 87530 as the only 

 possible type of P. c. obscura. 

 Polioptila nelsoni Ridgway 



Proc. Biol. Soc. Washington 16: 109, Sept. 30, 1903. 

 =Polioptila caerulea nelsoni Ridgway. See Hellmayr, Catalogue of 



birds of the Americas 7:488, 1934. 

 142695. Adult male. Oaxaca, State of Oaxaca, Mexico. June 21, 1894. 

 Collected by Edward W. Nelson and Edward A. Goldman. Original 

 number 2126. Received from the U.S. Fish and Wildlife Service. 

 Polioptila albiloris vanrossemi Brodkorb 



Journ. Washington Acad. Sci. 34 (9) : 312, Sept. 12, 1944. 

 54114 (not 54441). Adult male. Quiotepec, District of Cuicatlan, State 

 of Oaxaca, Mexico. Aug. 8, 1868. Collected by A. L. Fransois 

 Sumichrast. Original number 12. 

 Polioptila bairdi Ridgway 



Proc. Biol. Soc. Washington 16: 110, Sept. 30, 1903. 

 =Polioptila albiloris bairdi Ridgway. See Brodkorb, Journ. Washington 



Acad. Sci. 34:315, 1944. 

 89693. Adult male. San Juan del Sur, Department of Rivas, Nicaragua. 

 Jan. 6, 1883. Collected by Charles C. Nutting. Original number 364. 

 Polioptila supercOiaris magna Ridgway 



Proc. Biol. Soc. Washington 16: 110, Sept. 30, 1903. 

 =Polioptila plumbea bilineata (Bonaparte). See Hellmayr, Catalogue 



of birds of the Americas 7: 501,503, 1934. 

 189563. Adult female. Cartago, Province of Cartago, Costa Rica. 

 April 1886. Collected by Juan J, Cooper. Original number 17. Re- 

 ceived from the Museo Nacional de Costa Rica. 

 Polioptila plumbea cinericia Wetmore 



Smithsonian Misc. Coll. 134 (9) : 80, July 8, 1957. 

 461129. Adult male. Coiba Island, Pacific Ocean off the Province of 

 Veraguas, Panama. Feb. 1, 1956. Collected by Alexander Wetmore. 

 Original number 20558. 

 Polioptila nigriceps Baird 



Review of American birds 1:67 (in key), 69, July 1864. 

 =Polioptila nigriceps nigriceps Baird. See Helhnayr, Catalogue of birds 



of the Americas 7: 506, 1934. 

 23781. Adult male. "Mazatlan river," State of Sinaloa, Mexico. July 

 1861. Collected by John Xantus. Original number 294. 

 Culicivora plumbea Baird 



Proc. Acad. Nat. Sci. Philadelphia 7 (3) : 118 (not earlier than June 

 27), 1854. 



