BIRDS OF NORTH AND MIDDLE AMERICA 39 



Juvenal (sexes alike). — Like the corresponding stage of Orfalis vetula 

 vetula but with the pale underparts as in the adult. 



Downy young. — None seen. 



Adtdimale.—Wmg 173-204 (188.5); tail 201-226 (214); exposed 

 culmen 24-28 (25.5); tarsus 56-66 (61.3); middle toe without claw 

 42-50 (45.5 mm.). 38 



Adult female.— Wing 174-203 (189) ; tail 197-228 (211.5) ; exposed 

 culmen 24-26 (24.8) ; tarsus 55-62 (59) ; middle toe without claw 42-^5 

 (44.4mm.).3'' 



Range. — Resident in the drier parts of the Yucatan Peninsula (Chichen 

 Itza and Merida, and Meco, Holbox, Mujeres, and Cozumel Islands), and 

 adjacent parts of Campeche (La Tuxpena and Apazote). 



Type locality. — Yucatan. 



Ortalida maccalli (not 0. mccalli Baird) Lawrence, Ann. Lye. Nat. Hist. New 

 York, ix, 1869, 209 (IMerida, Yucatan; crit). 



Ortalida vehda (not Penelope vetula Wagler) Sclater and Salvin, Proc. Zool. Soc. 

 London, 1870, 538, part (monogr.). 



[Ortalida] vetula Gray, Hand-list, ii, 1670, 252, No. 9502, part.— Sclater and Salvin, 

 Proc. Zool. Soc. London, 1870, 543, part ; Norn. Av. Neotr., 1873, 137, part. 



0[rtalida] vetula Baird, Brewer, and Ridgway, Hist. North Amer. Birds, iii, 1874, 

 398, footnote, part. 



Ortalis vetula Boucard, Proc. Zool. Soc. London, 1883, 460, Yucatan; habits). — 

 Salvin, Ibis, 1889, 378 (Meco and Holbox Islands, Yucatan, crit.).— Ogilvie- 

 Grant, Cat. Birds Brit. Mus., xxii, 1893, 512, part (Holbox, Mujeres, Meco, 

 and Cozumel Islands, Yucatan) ; Handb. Game Birds, ii, 1897, 245, part.— 

 Salvtn and Godman, Biol. Centr.-Amer., Aves, iii, 1902, 280, part (Meco, Hol- 

 box, Cozumel, and Mujeres Islands and Merida, Yucatan). 



0[rtalis] vetida pallidiventris Ridgway, Man. North Amer. Birds, 1887, 209 (Yuca- 

 tan; coll. U. S. Nat. Mus.). 



Ortalis vetula pallidiventris Ridgway, Man. North Amer. Birds, 1887, 591. — Ch.^p- 

 MAN, Bull. Amer. Mus. Nat. Hist., viii, 1896, 288 (Chichen Itza, Yucatan; 

 habits; notes) .—Cole, Bull. Mus. Comp. Zool., 1, 1906, 115 (Chichen Itza).— 

 Miller and Griscom, Auk, xxxviii, 1921, 48 (crit.).— Peters, Check-list Birds 

 of World, ii, 1934, 19.— Traylor, Publ. Field Mus. Nat. Hist., zool. ser., xxiv, 

 1941, 204 (Chichen Itza, Yucatan; spec.).— Hellmayr and Conover, Cat. Birds 

 Amer., i. No. 1, 1942, 172 (syn. ; distr.). 



[Ortalis] pallidiventris Sharpe, Hand-list, i, 1899, 17. 



ORTALIS VETULA INTERMEDIA Peters 



Peten Chachalaca 



Adult (sexes alike). — Very similar to the adult of Ortalis vetida palli- 

 diventris but slightly darker above, more brownish, less grayish olive; 

 abdomen pale isabelline, the breast slightly duskier than in pallidiventris; 

 all but the median pair of rectrices tipped with light grayish isabelline. 



Juvenal. — None seen. 



' Eight specimens from Yucatan and Campeche. 

 ' Five specimens from Yucatan and Campeche. 



