7l4 BULLETIN 60, UNITED STATES NATIONAL MUSEUM. 



e«. Lores (normally) entirely black." » 



/. Wing shorter (averaging 45.3) ; under parts entirely pure white, or with 

 sides very faintly tinged with very pale bluish gray. (Yucatan.) 



Polioptila albiventris, adult male (p. 729) 

 /. Wing longer (averaging 48 or more); white of under parts strongly 

 shaded on chest and sides with pale bluish gray: 

 g. Gray of upper parts paler (as in P. albiventris and P. albiloris). 

 (Western Mexico, from Oaxaca to Sonora.) 



Polioptila nigriceps, adult male (p. 729) 

 gg. Gray of upper parts darker. 

 h. Tail averaging shorter than wing (wing averaging 48.3, tail 47.8); 

 chest more strongly shaded with gray. (Venezuela. ) 



Polioptila plumbiceps, adult male ( extralimital ) '' 

 li. Tail averaging longer than wing; chest more faintly shaded with 

 gray, 

 i. Wing averaging 51.3, tail 52.5; less white on lateral rectrices. 

 (Central Colombia. ) 



Polioptila anteocularis, adult male (extralimital) " 



"Sometimes, apparently only in winter (possibly only in immature) specimens 

 there is more or less admixture of whitish or pale gray on the lores. In some exam- 

 ples of P. albiventris there is a more or less marked indication of a white postocular 

 or supra-auricular streak, possibly indicating intermixture or intergradation with 

 P. albiloris or P. supercitiaris. 



i Polioptila plumbiceps Lawrence, Proc. Ac. Nat. Sci. Phila., xvii, 1865, 37 (Ven- 

 ezuela; coll. G. N. Lawrence;=youngmale); Richmond, Proc. U. S. Nat. Mus., xviii, 

 1896, 681 (Margarita I., Venezuela; crit. ); Robinson, Proc. U. S. Nat. Mus., xviii, 

 1896, 685 (La Guayra, Venezuela); Robinson and Richmond, Proc. U. S. Nat. Mus., 

 xxiv, 1901, 178 (coast of Venezuela); Clark (A. H.), Auk, xix, 1902, 266 (Jlar- 

 garita I.; descr. nest and eggs). — Polioptila nigriceps (not of Baird) Salvin and God- 

 man, Biol. Centr.-Am., Aves, i, 1879, 52, part (Venezuela) ; Sharpe, Cat. Birds Brit. 

 Mus., X, 1885, 447 (Caracas and Cumana, Venezuela); Berlepsch and Hartert, Novit; 

 Zool., ix, 1902, 9 (localities in Venezuela; excl. syn. anteocularis Hellmayr). — 

 Plolioptila^ nigriceps nigriceps HeWmSiyr, Novit. Zool., vii, 1900, 538, part (Venezuela); 

 Tierreich, 18 Lief., 1903, 25, part (Venezuela). — Plolioptilal leucogaslra (not syloid 

 iewcof/asij-a Maximilian) Ridgway, Proc. U. S. Nat. Mus., v, 1882, 387, 388, 389, part 

 (Venezuela). — Polioptila leucogaslra Allen, Bull. Am. Mug. N. PL, iv, 1892, 51 (Car- 

 lipano, Venezuela). — Polioptila sclateri Sharpe, Cat. Birds Brit. Mus., x, 1885, 449 

 (Venezuela; coll. Brit. Mus. ). 



The resemblance of the female of this form to that of P. leucogaslra shows it to be 

 much more nearly related to the latter than to P. nigriceps. 



"Polioptila leucogaslra (not Sylvia leucogaslra Maximilian) Sclater, Proc. Zool. Soc. 

 Lond., 1855, 12, part (Colombia); Ridgway, Proc. U. S. Nat. Mus., v, 1882, 387, 

 388, 389, part" (Bogota). — Polioptila nigriceps (not of Baird) Salvin and Godman, 

 Biol. Centr.-Am., Aves, i, 1879, 52, part (Colombia); Sharpe, Cat. Birds Brit. Mus., 

 X, 1885, 447, part (Bogota, Colombia). — Plolioptila'] nigriceps nigriceps Hellmayr, 

 Tierreich, 18 Lief., March, 1903, 25, part (Bogota). — [Polioptila nigriceps} anteocularis 

 Hellmayr, Novit. Zool., vii, no. 3, Dec. 8, 1900, 537, in text (Bogota).— P[oZio/)(i'W] 

 nigriceps anteocularis Hellmayr, Novit. Zool., vii, no. 3, Dec. 8, 1900, 538 (Bogota, 

 Colombia; coll. Berlin Mus. and Tring Mus.). 



According to Simons the adult male of this form has the iris "bright chrome 

 yellow," thatof the female being "yellowish" (Salvin and Godman, Ibis, 1880, 116). 



I have not seen the female, and therefore can not say whether, like those of 

 P. plumbiceps and P. leucogaslra it differs from thatof P. nigriceps in having the post- 

 ocular region blackish, or not. 



