340 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Adult female. — Similar to that of C. v. graysoni but averaging slightly 

 darker above, and with the breast less washed with ochraceous-tawny, 

 more heavily barred with dark brown to black, and the abdomen ground 

 color less buffy; thighs, vent, and under tail coverts more heavily barred 

 with dark brown ; size smaller ; maxilla dusky, mandible pale brownish ; 

 iris brown ; feet full grayish. 



Juvenal male. — Similar to the adult male but with the chin, throat, and 

 superciliaries buflfy, the top of the head paler, wood brown to buffy brown, 

 some of the feathers with broad medial streaks of dull sepia ; interscapulars 

 with the rufescent median parts duller and with whitish shafts ; wings and 

 lower back somewhat browner ; iris light brown ; feet pale flesh color ; bill 

 (in dried skin) tawny-brown above, yellowish below. 



Other plumages apparently unknown. 



Adult male.— Wing 98-105 (101.9) ; tail 51-62 (57.8) ; culmen from 

 cere 15.4-16.6 (16.0) ; tarsus 27.5-31 (29.2) ; middle toe without claw 

 24-26.5 (26.0 mm.). 23 



Adult female.— Wing 101-105 (103.1); tail 57-57.5 (57.3); culmen 

 from base 15.3-15.8 (15.5) ; tarsus 28.1-30.2 (29.4) ; middle toe without 

 claw 25.2-27 (26.1 mm.).^* 



Range. — Resident in the coastal area (from sea level to 3,000 feet) of 

 southeastern Oaxaca and southwestern Chiapas, from Tehuantepec City 

 to Tonala. 



Type locality. — Mexico, based on "Le Coyolcos" of Buffon. 



Tetrao coyoleos (typog. error) Muixer, Syst. Nat. Suppl., 1776, 129 (Mexico; 

 based on Le Coyolcos Buffon, Hist. Nat. Ois., ii, 486, ex "Coyolcozque" Her- 

 nandez, Hist. Anim. Nov. Hisp. p. 19). 



C[olinus] coyoleos Brewster, Auk, ii, 1885, 200, in text. 



[Tetrao] coyolcos Gmelin, Syst. Nat., i, pt. 2, 1788, 763 (cites Coturnix mexicana 

 Brisson, Av., i, 256; Coyolcozque sen Coli sonalis Ray, Av., 158; Coyolcos 

 Buffon, Ois., ii, 486; Lesser Mexican Quail Latham, Synopsis, ii, pt. 2,786; etc.). 



Tetrao coyolcos Vieillot, Nouv. Diet. Hist. Nat., xxv, 1817, 241. 



[Perdix] coyolcos Latham, Index Orn., ii, 1790, 653. 



P[erdix] coyolcos Bonnaterre, Tabl. Encycl. Meth., i, 1791, 215. 



0\_rtyx] coyolcos Gray, Gen. Birds, iii, 1846, 514. 



Ortyx coyolcos Gould, Monogr. Odontoph., pt. 3, 1850, pi. 6, right-hand fig., and 

 text, part. — Gray, List Birds Brit. Mus., pt. 5, Gallinae, 1867, 76. — Lawrence, 

 U. S. Nat. Mus. Bull. 4, 1876, 45 (Tapana and Santa Efigenia, Tehuantepec, 

 Oaxaca). — Ogilvie-Grant, Cat. Birds Brit. Mus., xxii, 1893, 423 (Juchitan, 



elsewhere. Thus, one male from San Mateo del Mar has the black area sharply 

 terminated at the posterior margin of the throat, the breast being rufescent like 

 the abdomen, while another from the same place has the breast all black. Two 

 birds from Huilotepec have unusually extensive amounts of white on the chin 

 and upper throat and resemble C. v. thayeri! The dark markings on the lower 

 back and rump vary greatly; most birds have them deep and numerous, one has 

 hardly any, while another has them very rufescent. 



"^ Nine specimens from Oaxaca. 



^ Three specimens from Oaxaca. 



