7l4 BULLETIN 50, WKITEi) STATES NATIONAL MUSEUM. 



ee. Lores (normally) entirely black." 

 /. Wing shorter (averaging 45. 3); under parts entirely ])ure white, or with 

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



Polioptila albiventris, adult male (p. 729) 

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

 shaded on chest and sides with pale bluish gray. 

 //. Gray of upper parts paler (as in P. alhiventrh and P. aJInlorh). 

 (Western Mexico, from Oaxaca to Sonora. ) 



Polioptila nigriceps, adult male (p. 729) 

 99- Gray of npj)er parts darker. 



/(. Tail averaging shorter than wing (wing averaging 48. .3, tail 47.8); 

 chest more strongly shaded with gray. (Venezuela.) 



Polioptila plumbiceps, adult male (extralimital) '' 

 /(. Tail averaging longer than wing; cliest 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. alhimitriff there is a more or less marked indication of a white i^ostocular 

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

 P. albiloris or P. superciliarift. 



^ PoKopHIa 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); RoI)inson and Richmond, Proc. U. S. Nat. Mus., 

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

 garita I.; descr. nest and eggs). — PoUoptUa 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). — 

 Plolioptilal vigriceps nigriceps He\\n\ayr, Novit. Zool., vii, 1900, 538, part (Venezuela); 

 Tierreich, 18 Lief., 1903, 25, part (Venezuela). — Plolioptila'] leucogasira (not sylria 

 /mcor/fl.s^ra Maximilian) Ridgway, Proc. U. S. Nat. Mus., v, 1882, 387, 388, 389, part 

 (Venezuela). — Pohopiila. leucogasira Allen, Bull. Am. Mus. N. H., 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. leucogasira shows it to be 

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



'^Polioptila leucogasira (not Sylvia leucogasira 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). — P[oHoptila'} nigriceps nigriceps Hellmayr, 

 Tierreich, 18 JJef., March, 1903, 25, part (Bogota). — IPolioptila nigriceps'] anteocularis 

 Hellmayr, Novit. Zool., vii, no. 3, Dec. 8, 1900, 537, in text (Bogota).— P[oZ/o/><(7a] 

 nigriceps anteocularis Hellmayr, Novit. Zoo!., 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 "l)right chrome 

 yellow," that of 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. leucogasira it differs from that of ]\ nigriceps in having the ])ost.- 

 o(!ular region blackish, or not. 



