208 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES OF PIONTJS. 



a. Primaries green. 

 6. Head blue (more or less deep); maxilla black (including unguis) with a reddish 

 spot on lower basal portion. (Costa Rica to Brazil, Bolivia, and Peru.) 



Pionus menstruus (p. 210). 

 66. Head not blue; maxilla not black (the unguis always light-colored), 

 c. Forehead dusky; bill reddish or partly dusky; lateral rectrices partly blue. 

 d. Bill partly dusky. 

 e. Bill yellowish, with basal portion dusky; back bronzy green or olive-green, 

 the under parts of body similar but paler. 

 /. Green color less olivaceous; under tail-coverts without distinct dusky 

 mesial streaks; feathers of malar region indistinctly margined with 

 dusky. (Southeastern Brazil; Paraguay.). 



Pionus maximiliani (extralimital).o 

 ff. Green color more olivaceous; under tail-coverts with distinct mesial 

 streaks of dusky; feathers of malar region conspicously margined 

 with black. (Bolivia and northern Argentina.) 



Pionus bridgesi (extralimital).* 

 ee. Bill reddish or pinkish, with part of maxilla dusky; back grayish olive- 

 green, under parts of body pale grayish brawn. (Venezuela; Colombia.) 



Pionus sordidus (extralimital).' 

 dd. Bill wholly red. (Colombia; Ecuador. ) . . Pionus eorallinus (extralimital)."* 

 cc. Forehead red or red and white; bill wholly yellowish; lateral rectrices with- 

 out any blue. 



a Psittacus maximiliani Kuhl, Consp. Psitt., 1820, 72 (Brazil). — P[ionus] maxU 

 miliani Wagler, Mon. Psitt., 1832, 603. — Pionus maximiliani Bonaparte, Bev. et Mag. 

 de Zool., (2) vi, 1854, 148 (mondgr.); Souanc<§, Icon. Perr., 1857, pi. 34, fig. 2; Salva- 

 dori, Cat. Birds Brit. Mus., xx, 1891, 327. — Pionias maximiliani Finsch, Die Papag., 

 ii, 1868, 448; Pelzeln, Orn. Bras., 1871, 264, 447, liii; Reichenow, Journ. fur Orn., 

 1881, 362; Consp. Psitt., 1882, 202; Vogelbild., 1880, pi. 10, fig. 7 '.—Psittacus 

 flavirostris Spix, Av. Bras., i, 1824, 42, pi. 31, fig. 2 (plains forests of Piauhy, s. 

 Brazil; coll. Munich Mus.) — Pionias flavirostris Reichenow, Journ. fur Orn., 1881, 363 

 (monogr.); 'Consp. Psitt., 1882, 203; Vogelbild., 1882, pi. 26, fig. 5.— Pionus siy 

 Souancd, Rev. et Mag. de Zool., 1856, 155 (Paraguay; Bolivia); Icon. Perr., 1857, 

 pi. 34, fig. 1. — Psittacus siy Gray, List Birds Brit. Mus., Psittacidse, 1859, 75. 



b Pionus bridgesi Boucard, The Humming Bird, i, April 1, 1891, 27 (Bolivia and 

 Corrientes, Argentina; coll. A. Boucard); Salvadori, Cat. Birds Brit. Mus., xx, 

 1891, 329. 



c [Psittacus] sordidus Linnseus, Syst. Nat., ed. 10, i, 1758, 99 ("Mexico"; based 

 on Psittacus fuscus Edwards, Birds, pi. 167). — Psittacus sordidus Vieillot, Nouv. 

 Diet. d'Hist. Nat., xxv, 1817, 329; Kuhl, Consp. Psitt., 1820, 74.— P[ionus] sordidus 

 Wagler, Mon. Psitt., 1832, 607. — Pionus sordidus Salvadori, Cat. Birds Brit. Mus., xx, 

 1891, 325. — Pionias sordidus Finsch, Die Papag., ii, 1868, 452, part, 956; Reichenow, 

 Journ. fur Orn., 1881, 363 (monogr.); Consp. Psitt., 1882, 203; Vogelbild., 1880, 

 pi. 10, fig. 4.— [Chrysotis] sordidus Swainson, Classif. Birds, ii, 1837, 301. 



d Pionus eorallinus Bonaparte, Rev. et Mag. de Zool., (2) vi, 1854, 148 ("Amferica] 

 mferidionali] " ; coll. Paris Mus.); Consp. Psitt., 1854, 5; Sclater, in Rowley's Orn. 

 Misc., iii, 1877, 6, 7, 8, pi. [80]; Salvadori, Cat. Birds Brit. Mus., xx, 1891, 326.— 

 Pionias eorallinus Reichenow, Journ. fur Orn., 1881, 363 (monogr.); Consp. Psitt., 1882, 

 203; Vogelbild., 1882, pi. 26, fig. 1. 



