354 BULLETIN" 50, UNITED STATES NATIONAL MUSEUM. 



light gray (between light neutral gray and gull gray); bill black; 

 legs and feet light brownish (probably lake red in life); wing, 152; 

 tail, 108.5; exposed culmen, 15; tarsus, 22.5; middle toe, 20."^ 

 Yucatan (M6rida). 



Zenaidura yucatanensis Lawrence, Ann. Lye. Nat. Hist. N. Y., ix, 1869, 207 

 (Merida, n. Yucatan; coll. U. S. Nat. Mus.). — Baird, Brewer, and Ridg- 

 WAY, Hist. N. Am. Birds, iii, 1874, 382.— Salvin, Ibis, 1874, 312 (crit.).— 

 Sanchez, Anal. Mus. Nac. Mex., i, 1878, 105.— Ridgway, Auk, i, 1884, 96 

 (crit.). — Salvadori, Cat. Birds Brit. Mus., xxi, 1893, 373, footnote. — Salvin 

 and GoDMAN, Biol. Centr.-Am., Aves, iii, 1902, 242, footnote. 



[Zenaidura] yucatanensis Gray, Hand-list, ii, 1870, 236, no. 9284. — Sharpe, Hand- 

 list, i, 1899, 76. 



Z[enaidurd\ yucatanensis Ridgway, Man. N. Am. Birds, 1887, 213. 



Chamaepelia yucatanensis Giebel, Thes. Orn., i, 1872, 636. 



Genus ZENAIDA Bonaparte. 



Zenaida Bonaparte, Geog. and Comp. List, 1838, 41. (Type, by tautonymy, Z. 



amabilis Bonaparte = CoZum6a zenaida Bonaparte.) 

 Zenxda (emendation) Coues, Key N. Am. Birds, 1872, 226. 

 Stenuroena Reichenbach, Vollst. Natxug., Columbariae, i, 1861, 20. (Type, by 



monotypy, Zenaida stenura Bonaparte.) 

 Platypteroena Reichenbach, Vollst. Naturg., Columbariae, i, 1861, 20. (Type 



by monotypy, Zenaida pentheria Bonaparte=Z. ruficauda Bonaparte.) 



Rather small arboreal or semiterrestrial pigeons, closely resem- 

 bling Zenaidura, but with tail not more than two-thirds as long as 

 wing, graduated for not more (usually less) than one-fourth its length. 



Bill small and slender, the exposed culmen not longer (usually 

 shorter) than lateral toes (without claws), its greatest depth equal to 

 little more than one-fourth the length of exposed culmen, the maxil- 

 lary unguis rather distinctly arched and with basal portion slightly 

 but distinctly elevated, the gonydeal angle rather prominent; frontal 

 feathering advancing as far as or slightly beyond malar antia, the 

 mental antia extending about as far as anterior end of nasal oper- 

 culum, the latter moderately large and distinctly tumid. Wing 

 moderate or rather large, moderately pointed, the longest primaries 

 exceeding distal secondaries by a little less than two-fifths the length 

 of wing; first or second primary (from outside) longest, the first 

 (outermost) always longer than fourth, its inner web sometimes dis- 

 tinctly sinuated or emarginated terminally. Tail about two-thirds 

 as long as wing, graduated for not more (usually less) than one-fourth 

 its length, composed of fourteen rectrices, which are moderately to 

 very slightly narrowed terminally, their tips rounded. Tarsus dis- 

 tinctly (but slightly) longer to very slightly shorter than middle toe 

 (without claw), its upper portion (together with tibio-tarsal joint) 

 naked, the acrotarsium covered by a single series of large, transverse 

 scutella, the planta tarsi with small hexagonal scales; lateral toes 



o One specimen (the type; only example known). 



