BIEDS OF NORTH AND MIDDLE AMEEICA. 109 



gg. Bill much smaller, the culmen veiy slightly if at all longer than outer 

 hind toe without claw; anterior lateral outline of cere straight or 

 faintly concave (without convexity in front of nostril); excision 

 of mandibular tomium deep and narrow; comigations on palatal 

 surface of maxillary unguis obsolete; sides of forehead naked. 



Orthopsittaca (extralimital).o 



ff. Loral and suborbital regions feathered, separating the rather small 



orbital from the large post-man dibular naked space; maxillary 



unguis attenuated and acute; tip of mandible very short; forehead, 



sviborbital region, and auricular region yellow. 



Oguorh3mclius (extralimital).^ 

 dd. Smaller (length less than 300 mm.); bill much broader, more swollen later- 

 ally, the width of maxilla at base equal to much more than half the 

 length of culmen, the greatest width of mandible equal to length of 

 gonys; maxillary unguis extremely attenuated and acute (but lores 

 naked and no exposed naked post-mandibular area, and no yellow on 

 head); tail shorter than wing; cheeks normally feathered. 



Diopsittaca (extralimital).c 



cc. Only the orbital region and chin naked. 



d. Cere densely feathered to anterior margin. 



e. Bill very large and much compressed; maxillary unguis deep (vertically) 



and narrow (transversely), its lateral width at base about twice its 



transverse diameter, its palatal surface with corrugations indistinct 



or obsolete; width of chisel-like tip of mandible equal to only one-fifth 



the length of gonys, the latter with a distinct median groove; tail less 



than three-foiu-ths as long as wing Rhynchopsitta (p. 140). 



ee. Bill relatively much smaller, not compressed; maxillary unguis relatively 

 shallow and broad, its lateral vridth at base little if any greater than its 

 transverse diameter, its palatal surface with corrugations distinct; 

 width of chisel-like tip of mandible equal to one-third the length of 

 gonys, the latter without any median groove; tail more than three- 

 fourths as long as wing. 



a Orthopsittaca Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 99. (Type, 

 Psittacus manilatus Boddaert.) {OpeSs, straight; xpirraKr], a parrot; with reference to 

 the straight vertical outline of base of the maxilla.) 



b Ognorhynchus, Bonaparte, Remarques Obs. Blanchard Psittacides, 1857, 6. (Type, 

 Conurus icterotis Souanc^.) — Gnathosittaca Cabanis, Joum. fiir Orn., xii, Nov., 1864, 

 415. (Tj'pe, G. heinei Cahanis= Conurus icterotis Souanc^.) (Tvados, Kinnlade, 

 aiTTa.Kri=Psittacu^; Cabanis.) Colombia and Ecuador. (Monotypic.) 



c Diopsittaca Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 99. (Type, Psit- 

 tacus nobilis Linnaeus.) (AIos, noble; xptTTaKr], a parrot.) Includes also Diopsittaca 

 hahni (Souanc6). 



Trinidad and Guiana to Southern Brazil. (Two species.) 



The two species of this very strongly characterized genus further agree in their 

 almost wholly green coloration relieved by red under wing-coverts and yellowish olive 

 under sui-face of remiges and rectrices, the green of the head becoming more bluish 

 on forehead. The form of the bill is very much as in Ognorhynchus, but the maxillary 

 unguis is even more attenuated terminally and the mandible relatively shorter, with 

 its chisel-like tip more produced; besides, the cere is naked, fully exposing the nos- 

 trils, that of Ognorhynchus being very densely feathered to the extreme anterior edge. 



