36 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



ochraceous-buff to dark ochraceous-buff with a trace of ochraceous- 

 salmon; breast less olive, more grayish — ashy grayish olive; upperparts 

 of body more brownish — light brownish olive; rectrices slightly more 

 ashy and the pale tips light to dark ochraceous-buff, not white, and much 

 broader than in the nominate form (45-60 mm. ) ; iris hazel-brown ; bare 

 orbital and gular skin carmine ; bill light plumbeous ; tarsi and toes ashy. 



Juvenal (sexes alike). — Similar to the corresponding stage of Ortalis 

 vetula vetula but the abdomen whitish as in the adult (above), the breast 

 less tawny, more grayish, the sides, flanks, thighs, and under tail coverts 

 light ochraceous-buff; the upperparts of the body slightly paler — light 

 brownish olive; rectrices slightly more ashy, tipped with fulvescent and 

 pointed in shape. 



Downy young (male only seen). — Similar to the buffy (not the gray- 

 ish) type of the similar plumage in the nominate form, but all of the rufes- 

 cent-brownish areas paler, more buffy; the breast more grayish — drab 

 mottled with buffy avellaneous. 



Adult male.—Wmg 235-282 (248.4) ; tail 263-310 (283.2) ; exposed 

 culmen 26-33 (29.8) ; tarsus 68-77 (71.5) ; middle toe without claw 

 52-62 (55.5 mm.).^^ 



Adult female.— Wing 229-263 (244) ; tail 247-304 (276) ; exposed 

 culmen 25-28 (27.3) ; tarsus 66-72 (70.1) ; middle toe without claw 

 52-57 (55 mm.). 34 



Range. — Resident in southwestern Mexico from Colima (Mazanillo and 

 Rio de la Armeria) ; Michoacan (La Salada and Tupila River) ; Morelos 

 (Tetela del Volcan) ; western Puebla (Chachapa) ; and Valley of Mexico 

 (City of Mexico and Real Aribe) ; to Guerrero (Tlalixtaquilla, Papayo, 

 Camaron, Ometepec, Sepuatenejo, and Mexcala) ; to western Oaxaca 

 (Chivela, Pluma, Huilotepec, Llano Grande, Chicapa, Tapana, Barrio, 

 Tehuantepec City, Salina Cruz, Rio Grande, Santa Efigenia, Torullo, and 

 Tapantapec) ; and western Chiapas (Tonala). 



Type locality. — Mexico. I restrict it to La Salada, Michoacan. 



P[enelope\ poliocephala Wactjer, Isis, 1830, 1112 (Mexico; coll. Berlin Mus.). 

 0[rtalida\ poliocephala Wagler, Isis, 1832, 1227. — Reichenbach, Voll. Nat. 



Tauben. 1861, 145. — Baird, Brewer, and Ridgway, Hist. North Amer. Birds, 



iii, 1874, 398, footnote. 

 [Ortalida] poliocephala Reichenbach, Synop. Av., Columb., ii, 1847, pi. 169, fig. 



1490. — Salle and Parzudaki, Cat. Oiseaux ]Mexique, 1862, 6 (Mexico). — 



Gray, Hand-list, ii, 1870, 252, No. 9512.— Sclater and Salvin, Proc. Zool. Soc. 



London, 1870, 543 ; Norn. Av. Neotr., 1873, 137. 

 Ortalida polioceph<ila Sclater and Salvin, Proc. Zool. Soc. London, 1869, 364 (near 



City of ^Mexico; crit.) ; 1870, 537 (monogr.). — Lawrence, Mem. Boston Soc. 



Nat. Hist., ii, 1874, 306 (Rio Tupila, Colima) ; U. S. Nat. :Mus. Bull. A, 1876, 



45 (Tapana, Barrio, and Tehuantepec City, Oaxaca; fresh colors of nude 



^ Fifteen specimens from Michoacan, Morelos, -western Oaxaca, and Guerrero. 

 ^' Six specimens from Michoacan, Colima, western Oaxaca, and Guerrero. 



