BIRDS OB* NORTH AND MIDDLE AMERICA. 217 



Pionius senilis Lawrence, Ann. Lye, N. Y., viii, 1867, 184 (Greytown, Nic- 

 aragua); ix, 1868, 131 (San Jose and Barranca, Costa Eica). — Zeled6n, 

 Anal. Mus. Nac. C. R., i, 1887, 124 (Alajuela, Zarcero de Alajuela, Las Trojas, 

 Barranca, Jimenez, and Monte Redondo, Costa Rica.) 



Pvmias senilis Finsch, Die Papag., ii, 1868, 460. — Pelzeln, Orn. Bras., 1870, 

 264, footnote. — Reichenow, Journ. fur Orn., 1881, 364 (monogr.); Consp. 

 Psitt., 1882, 204; Vogelbild., 1880, pi. 10, fig. 6.— Ridgway, Proc. U. S. 

 Nat. Mus., x, 1888, 592 (Rio Segovia, Honduras). 



Amazona senilis Schleqel, Mus. Pays-Baa, iii, no. 26 (Psittaci), 1864, 62; no. 38 

 (Revue), 1874, 29. 



Psittacus leucorhynchus Swainson, PMlos. Mag., n. s., i, no. 6, June, 1827, 438 

 (purchased in city of Mexico; coll. Bullock). 



Genus AMAZONA Lesson. 



Amazona Lesson, Traits d' Orn., 1831, 189. (Type, Psittacus pulverulentus 



Gmelin= P. farinosus Boddaert.) 

 Chrysotis Swainson, Classif. Birds, ii, 1837, 300. (Type, Psittacus sestivus 



Gmelin=P. amazonwus Linnaeus.) 

 Androglossa "Vigors, Zool. Journ., ii [1825], p. 400" Reichenow, Journ. fur 



Orn., 1881, 365. (Type, Psittacus farinosus Boddaert.) 

 (Enochrus Bonaparte, Rev. etMag. de Zool., (2) vi, 1854, 151. (Type, as fixed by 



Gray, Psittacus vinaceus Kuhl.) 

 Onochrus (emendation) Bonaparte, Naumannia, 1856, Consp. Psittacorum, 



genus 22. 



Medium sized or rather small to large, short-tailed Psittacidse 

 (length about 235-460 mm.) closely resembling Pionus but with tail 

 not less than half nor as much as two-thirds as long as wing, slightly 

 rounded, the rectrices broadly rounded at tip; feathers of neck 

 (especially hindneck) long and broad (to a greater or less degree), 

 sometimes developed into a distinct erectile ruff, and with under 

 tail-coverts never red but wing usually with red either on distal 

 secondaries, primary covertsj> or some part of anterior margin. 



Bill much shorter than head, much deeper than long; culmen 

 slightly shorter to much longer than outer front toe without claw, 

 regularly and strongly decurved from base, more or less broadly 

 flattened (excepts terminally), the flattened summit sometimes 

 distinctly ridged laterally; depth of maxilla at base equal to or 

 slightly less than its width, and slightly less than half to nearly two- 

 thirds the length of culmen; maxillary unguis variable as to relative 

 length but usually longer than wide (wider than long in A. agilis), 

 never acute at tip, the distinctly ridged palatal surface usually 

 slightly hollowed (sometimes nearly flat) but occasionally (in 

 A. agilis) deeply excavated; maxillary tomium with a more or less 

 broad and deep" post-ungual notch (shallow rounded sinus or concave 

 incision in A. agilis and A. xaniholora) preceded by a more or less 

 prominent (usually obtusely and broadly angular) projection; depth of 

 mandible at base equal to less (usually much less) than length of 

 gonys, much less than its width, the width of the more or less rounded 

 to nearly flat tip less (usually decidedly less) than half the length of 

 gonys; mandibular tomium with a broad, more or less deep sub- 

 terminal concave excision, the proximal portion usually more or less 



