270 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



■depth of bill at base, 7.;»-8.6(S.i); tarsus, 22. 1-23. i* (23.1); middle toe, 

 15.2-1T.3 (16.5).^ 



Southeastern Mexico, in Slates of Guanajuato(?), Vera Cruz, (Cor- 

 dova, Jalapa), Oaxaca (Chihuitaii, Tehuantepec, Totontepee, Santo 

 Domingo), and Chiapas, southward through Central America to the 

 Isthmus of Panama. 



Xanthurnus prosthemdax Strickland, Jardiiif's Contr. Orn., 1850, 120, ]>1. (ili 

 (Guatemala; coll. H. Strickland). 



Icterus prosthemelas Sclater, Proc. Zool. Soc. Lond., 1856, 301 (Cordova, Vera 

 Cruz); 1857, 7 (crit.); Cat. Am. Birds, 1862, 132 ("Central America"); Cat. 

 Birds Brit. Mus., xi, 1886, 373 (Corosal and Belize, British Honduras; Choc- 

 tum. Vera Paz, and sources Rio de la Pasion, (juatemala; San Pedro, Hon- 

 duras; Peje and Tucurriqui, Costa Rica). — Sclater and Salvin, Iljis, 1859, 

 20 (Guatemala); Proc. Zool. Soc. Lond., 1867, 279 (BlewfieldsR., Nicaragua); 

 1870, 837 (San Pedro, Honduras) .—Moore, Proc. Zool. Soc. Lond., 1859, 58 

 (Comayagua, Honduras). — (?) Duces La Naturaleza, i, 1868, 139 (Guanajuato, 

 Mexico).— Lawrence, Bull. U. S. Nat. Mus., no. 4, 1876, 23 (Chihuitan, 

 Oaxaca). — Boucard, Proc. Zool. Soc. Lond., 1878, 59 (Naranjo, Costa Rica). — 

 Zeledon, Cat. Aves de Costa Rica, 1'882, 9; An. Mus. Nac. Costa Rica, i, 1887, 

 112 (Jimenez; Naranjo de Cartage). — Ridgway, Proc. U. S. Nat. Mus., x, 

 1887, 580 (Truxillo, Honduras); x, 1888, 588 '(Segovia R., Honduras).— Sal- 

 ' viN and Godman, Biol. Centr.-Am., Aves, i, 1887, 466. — Richmond, Proc. 

 U. S. Nat. Mus., xvi, 1893, 495 (Rio Escondido, Nicaragua). 



[Icterus'] jirostfwmclas Sclater and Salvin, Nom. Av. Neotr., 1873, 36. 



Ilctn-us} 'prosthemelas Ridgway, Man. N. Am. Birds, 1887, 375. 



Icterus dorn'micensis, var. prosthemelas Baird, Brewer, and Ridgway, Hist. N. 

 Am. Birds, ii, 1874, 182. 



^ Nine specimens. 



Specimens from different localities average as. follows: 



Loeality. 



MALES. 



Two adult males from .southeastern Mexico. 



Four adult males from Guatemala 



Seven adult males from Honduras 



Three adult males from Nicaragua 



Three adult males from Costa Rica 



Two adult males from Panama 



FEMALES. 



One adult female from southeastern Mexico 



Two adult females from Honduras 



Three adult females from Nicaragua 



Three adult females from Costa Rica 



Middle 

 toe. 



16 



15.6 



15.7 



17.3 



16.8 



16 



1.5. 5 

 15.7 

 16.8 

 16.5 



As a rule, specimens from Honduras and Nicaragua have more black on the under 

 parts, that of the anterior portions extending farther backward (sometimes covering 

 entire breast), the sides and flanks more or less clouded or otherwise marked (some- 

 times heavily) with black. The series is not complete enough, however, to show 

 whether there are constant differences. 



