On the Genus Elaenia. 403 



This species while closely resembling' E. flavogaster in its 

 coloration is nevertheless quite distinct, differing- in the form 

 of the crest-feathers which are "but slightly elongated and 

 never lanceolate or -linear, but of an ordinary shape, being- 

 only slightly acuminated at the tip. The bill as a rule is 

 much narrower at the base, also more elongated, straighter 

 and less curved than in E. flavogaster. The wings and tail as a 

 rule are shorter. The feathers of the back have generally 

 lighter margins, this producing a somewhat spotted appearance. 

 The underparts as a rule are lighter, the yellow mesial line of 

 the belly more mixed with whitish. 



17. Elaenia albiceps (Lafr. et D'Orb.). 



Muscipeta albiceps Lafr. et D'Orb., Syn. Av. I. in Mag. 



Zool., 1837, p. 47 (descr. orig. specilli, ex Yungas, Bolivia 



et Tacna, Peru, typ. select, ex Tungas, in Mus. Paris, 



excl. specim. ex Bio) ; D'Orb., Voy. Am. mérid. Ois. (1840), 



p. 319 (Tacna, Yungas). 

 Myiobius albiceps Gray, Gen. Birds, I. (1847), Myiobius, 



sp. 30. 

 Tyrannula albiceps Bonap., Consp. Av. I. (1850), p. 190 (ex. 



Lafr. et D'Orb.). 

 Elaenea cryptoleuca Burnì., J. f. O., 1858, p. 158 (Mendoza). 

 Elainea modesta Cab. et Heine (nee Tschudi), Mus. Hein, 



IL (1859), p. 59 (Chile) ; ? Sci. et Salv., Ibis, 1868, p. 185 



(Magellaiiia) ; Heine et Reichen., Nomen cl. Av. Mus. 



Hein. (1890), p. 143. 

 Elaenea modesta Burnì, (nee Tsch.), J. f. O., 1860, p. 246 



(Mendoza) . 

 Elainea modesta (part.) Burm. (nee Tsch.), Reise La Plata 



Staat., II. (1861), p. 454 (Mendoza and Catamarca) ; 



Hartert, Kat. Vogels. Seiickenberg Ges. (1891), p. 102 



(Chile). 

 Elainea griseigularis (part.) Sci. (nee Sci., 1858), Cat. Coll. 



Am. B. (1862), p. 217 (specim. c. ex Chile). 

 Elainea albiceps Sci., P.Z.S., 1867, p. 327 (Chile) ; ? Sci. et 



Salv., P.Z.S., 1878, p. 433 (Port Currucha) ; Sci. et 



