40 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Downy young. — None seen. 



Adult male.— Wing 181-190 (186.6); tail 225-258 (237); exposed 

 culmen 23.5-27 (25) ; tarsus 58-65 (61.8) ; middle toe without claw 42-43 

 (42.5 mm.). *o 



Adult female.— Wing 172-183; tail 215-235; exposed culmen 22-24.5; 

 tarsus 62.5-64; middle toe without claw 41 mm.*^ 



Range. — Resident in southern Quintana Roo (Camp Mengel) and the 

 Peten district of Guatemala (Uaxactiin and Chuntuqui). Doubtfully dis- 

 tinct from pallidiventris. 



Type locality. — Camp Mengel, Quintana Roo, Mexico. 



Ortalis vetula intermedia Peters, Auk, xxx, 1913, 371 (Camp Mengel, Quintana 

 Roo, se. Mexico; coll. Mus. Comp. Zool.). — Miller and Griscom, Auk, xxxviii, 

 1921, 48 (crit.).— Griscom, Amer. Mus. Nov. No. 235, 1926, 7 (e. Quintana 

 Roo, Yucatan). — Bangs, Bull. Mus. Comp. Zool., Ixx, 1930, 154 (type spec, in 

 Mus. Comp. Zool.; crit.). — Peters, Check- list Birds of World, ii, 1934, 19. — 

 Van Tyne, Misc. Publ. Univ. Michigan Mus. Zool., No. 27, 1935, 11 (Peten, 

 Guatemala, Uaxactun, Chuntuqui; crit.). — Trayloe, Publ. Field Mus. Nat. Hist., 

 zool. ser., xxiv, 1941, 198, 204 (Campeche; Matamoros — spec). — Hellmayr and 

 CoNOVER, Cat. Birds Amer., i, No. 1, 1942, 171, part (syn. ; distr.). 



0\rtalis] v[etula] intermedia Miller and Griscom, Auk, xxxviii, 1921, SO (diagnosis). 



OETALIS VETULA VALLICOLA Brodfcorb 



Brodkorb's Chachalaca 



Adult (sexes alike). — ^Very "similar to 0. v. intermedia, but larger; 

 breast somewhat paler and grayer ; flanks, crissum, and thighs on average 

 more brownish olive, less rufescent. . . . Resembles 0. v. vetula in size 

 but is paler throughout, including the tips of the rectrices" {ex original 

 description as are also the measurements). 



Adult male.— Wing 207-214 (210.3) ; tail 234-252 (245.3 mm.). 



Adult female.— Wing 192-199 ; tail 216-239 mm. 



Range. — Known only from the dry upper part of the Grand Valley 

 of the interior of Chiapas. 



Type locality. — Malpaso, Chiapas. 



Ortalis vetula intermedia Hellmayr and Conover, Cat. Birds. Amer., i, No. 1, 1942, 

 171, part (Malpaso, Chicomuselo). 



Ortalis vetula vallicola Brodkorb, Proc. Biol. Soc. Washington, Iv, 1942, 182 (Mal- 

 paso, Chiapas; meas. ; distr.; crit.). 



ORTALIS VETULA PLUMBICEPS (Gray) 



Plumbeous-capped Chachalaca 



Adult (sexes alike). — Similar to Ortalis vetula jalapensis but slightly 

 more olivaceous above, especially in fresh plumage, and the tips of the 



" Three specimens from Quintana Roo and Peten. 

 '"■ Two specimens from Quintana Roo and Peten. 



