726 BULLETITSr 50, UNITED STATES NATIONAL MUSEUM. 



POLIOPTILA BAIRDI Ridgway. 

 NICARAeUAN GNATCATOHEK. 



Similar to P. alUloris, but wing and tail shorter, especially the 

 latter; adult male with loral region partly black, usually as a spot at 

 anterior angle of eye or a streak from anterior angle of eye to, or 

 nearly to, base of maxilla. 



Adult Tnale.— Length (skins), 105-108 (106); wing, 46-50 (47.5); 

 tail, 45^9 (46.8); exposed culmen, 11.5-12.5 (11.9); tarsus, 17-18 

 (17.5); middle toe, 9-9.5 (9.2).« 



AduUfemale.— Length (skms), 106; wing, 43.5^6.5 (45); tail, 42.5- 

 44 (43.5); exposed culmen, 12; tarsus, 17-17.5 (17.3); middle toe, 

 9-9.5 (9.3).* 



Western Nicaragua (Realejo; San Juan del Sur; Sucuyd; Grenada) 

 and Costa Rica (Liberia; Volcan de Miravalles; Cartago?) 



PolioptUa albUoris (not of Sclater and Salvin) Baird, Review Am. Birds, 1864, 

 70, part (description; Grenada and Eealejo, Nicaragua). — Salvin and God- 

 man, Biol. Centr.-Am., Aves, i, 1879, 53, part (Grenada and Eealejo, Nica- 

 ragua).— Nutting, Proc. U. S. Nat. Mus., vi, 1883, 373 (San Juan del Sur, 

 Nicaragua) . — Zeledon, Anal. Mus. Nac. Costa Kica, i, 1887, 105 (Liberia and 

 Cartago, Costa Rica). 



Plolioptila'] alUloris Ridgway, Proc. U. S. Nat. Mus., v, 1882, 387, 388, 389, part 

 (Realejo, Nicaragua); Man. N. Am. Birds, 1887, 569, part (Nicaragua). — 

 (?) Hellmayr, Novit. Zool., vii, 1900, 536, in text, part (crit. ); Tierreich, 

 18 Lief., 1903, 28, part (Nicaragua; Miravalles, Costa Rica). 



PolioptUa bilineata (not Culicivora bilineata Bonaparte) Nutting, Proc. U. S. Nat. 

 Mus., vi, 1883, 380, part (Sucuyd, Nicaragua). 



P[olioptUa] leucogastra (not Sylvia leucogaslra Maximilian) Ridgway, Proc. U. 8. 

 Nat. Mus., V, 1882, 387, in text, 388, part (Grenada, Nicaragua). 



P[plioptila'\ alMlora Ridgway, Proc. TJ. S. Nat. Mus., v, 1882, 388, in text, part 

 (Realejo, Nicaragua). 



PolioptUa bairdi Ridgway, Proc. Biol. Soc. Wash., xvi, Sept. 30, 1903, 110 (San 

 Juan del Sur, Nicaragua; coll. U. S. Nat. Mus.). 



POLIOPTILA BILINEATA (Bonaparte). 

 BONAPARTE'S GHATOATGHER. 



Similar to P. hairdi, but with loral region entirely white, confluent 

 with a broad superciliary streak (as in P. super ciliaris); wing averag- 

 ing longer, tail decidedly shorter, and feet smaller." Similar in head- 

 pattern to P. superciliaris, but bird decidedly larger and coloration 

 much paler, the gray of back, etc., and white of under parts being as 

 in P. albiloris and P. hairdi. 



Adult maZe.— Length (skins), 100; wing, 48-50 (49); tail, 42^4 (43); 

 exposed culmen, 11.5-12 (11.8); tarsus, 15-16.5 (15.8); middle toe, 8-9 

 (8.3).* 



« Six specimens. 

 !> Three specimens. 



"These differences of proportions are very obvious in adult males (especially as to 

 the both relatively and absolutely shorter tail), less so in females. 



