BIRDS OF NOETH AND MIDDLE AMEEICA. 115 



cc. Larger (wing not less than 135 mm.) ; maxilla broader, more strongly decnrvecl 



and more compressed terminally, its tomia distinctly notched and ' ' toothed ' ' ; 



palatal surface of unguis not deeply hollowed, usually nearly (sometimes 



quite) flat; lateral anterior outline of cere strongly sinuated, the upper (pre- 



nasal) portion strongly convex, the lower portion drawn backward nearly 



if not quite to the loral feathering; nostrils anterior to middle of cere; under 



tail-coverts falling far short of tip of tail. 



d. Tail less than two-thirds as long as wing. 



e. Smaller (wing less than 150 mm.; or else not more than 170 mm., with 



under wing-coverts red, and under tail-coverts without red). 



/. Depth of mandible at base greater than length of gonys; tail more 



than half as long as wing, nearly truncate; inner webs of remiges 



wholly slate-blackish and tail wholly green. .Pionites (extralimital).o 



ff. Depth of mandible at base less than half the length of gonys; tail not 



more than half as long as wing (or else lores densely feathered and 



auricular feathers narrow and somewhat elongated), more or less 



strongly rounded (sometimes almost graduated); inner webs of 



remiges (except near shaft) blue, greenish blue, or bluish green and 



inner webs of rectrices partly yellow or red (or else, in Pionopsitta, 



tail mostly blue). 



g. Tail half as long as wing or slightly more, graduated for at least length 



of gonys, the rectrices distinctly narrowed terminally; inner 



webs of rectrices not distinctly different in color from outer web. 



h. Bill much broader, the maxilla swollen laterally, its width at 



base much greater than length of gonys and equal to three-fourths 



the length of culmen; maxillary tomium with distinct post- 



ungual notch and "tooth"; base of mandible beneath broad 



and shallowly concave; tenth (outermost) primary much longer 



than seventh; lores scantily feathered; tail blue and green; 



sexes different in color, the adult male with forehead, crown, 



postocular region and part of auricular region red, the adult 



female without any red Pionopsitta (extralimital).^ 



hh. Bill much narrower, the maxilla compressed laterally, its width 

 at base equal to but little more than length of gonys and much 

 less than three-fourths the length of culmen; maxillary tomium 

 without distinct, if any, post-ungual notch or "tooth"; base of 

 mandible beneath narrowly and deeply concave; tenth (outer- 

 most) primary equal to seventh; lores densely feathered; 

 auricular feathers narrow, somewhat elongated; tail dusky 

 blue distally, dusky red proximally; sexes alike in color. 



Hapalopsittaca (extraLimital).c 



a Caica (not of Lesson, 1847) Bonaparte, Oonsp. Gen. Av., i, 1850, 5. (Type, Psittacus 

 melanocephalus Linnaeus.) — Pionites Heine, Nom. Mus. Hein. Orn., 1890, 231. (Type, 

 Psittacus melanocephalus Linngsus.) 



Guiana and Amazon Valley. (Four species.) 



b Pionopsitta Bonaparte, Rev. et Mag. de Zool., (2) vi, 1854, 152. (Type, Psittacus 

 pileatus Scopoli.) — Pionopsittacus (emendation) Sundevall, Met. Nat. Av. Disp. 

 Tent., 1872, 69. 



Paraguay and southeastern Brazil. (Monotypic.) 



c Hapalopsittaca Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 100. (Type, 

 Psittacus amazoninus Des Murs.) {'AiraXos, delicate; xpLrraKri, a parrot.) 



Colombia and Ecuador. (Two species, one of which, H. pyrrhops (Salvin), I 

 have not seen.) 



