110 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



/. Tail as long as wing; tenth (outermost) primary shorter than seventh; 

 tarsus as long as outer front toe without claw; rump yellow, primaries 



greenish blue, tail greenish olive Cyanoliseus (extralimital).o 



ff. Tail shorter than wing; tenth (outermost) primary longer than seventh; 

 tarsus much shorter than outer front toe without claw; rump and 

 primaries green, tail green or dull red. 

 g. Prefi'ontal feathers shorter, softer; loral feathers smaller, less dense; 

 culmen flattened, more or less distinctly ridged laterally; tail dull 

 red; pileum barred or spotted with black. 

 Tx. Maxilla elongated, the tip (unguis) much produced (as long as or 

 longer than rest of maxilla), less strongly decurved, the culmen 

 aa long as outer front toe with claw. 



Enicognathus (extralimital).^ 



lih. Maxilla not elongated, its tip (unguis) short and strongly decurved 



(much shorter than rest of maxilla), the culmen shorter than 



middle toe without claw Microsittace (extralimital). c 



gg. Prefrontal feathers longer, stiff er, more erect; loral feathers larger, 

 more dense; culmen rounded; tail green; pileum without black. 



Conuropsis (p. 143). 

 M. Cere incompletely feathered. 



e. Seventh primary attenuated terminally. 



/. Maxilla swollen laterally, much wider than deep at base, broadly arched 



in transverse section, its tip attenuated, aciite, and ridged; feathers 



of cheeks narrow, distinctly outlined; cere naked behind nostrils; 



inner web of rectrices mostly red Thectocercus (extralimital).<* 



o Cyanoliseus Bonaparte, Rev. et Mag. de Zool., (2) vi, 1854, 150. (Type, Psittacus 

 q/anolyseos Molina=PsiWacMS {Aratinga) hyroni Children MS.). — Cyanolyseus (emen- 

 dation) Bonaparte, Ann. Soc. Nat., (4), i, 1854, 108. — Cyanoliseos (emendation) Gray, 

 List Birds Brit. Mus., Psitt., 1859, 34. — Cyanolyseos (emendation) Sclater, Cat. Am. 

 Birds, 1862, 346. 



Southern Argentina and Chile. (Two species?; possibly monotypic, the two 

 recognized forms differing chiefly in size.) 



& Enicognathus Gray, Gen. Birds, 1840, 51. (Type, Psittacara leptorhyncha King.) — 

 Henicognaihus (emendation) Agassiz, Nom. Zool. Index Univers., 1846, 178. — 

 Stylorhynchus Lesson, L'Echo du Monde Savant, 1844, 184. (Type, Arara crythro- 

 frons Ijesson^Psittacara leptorhyncha King.) — Ilylorhynchus Gray, Cat. Gen. and Sub- 

 gen. Birds, 1855, 87. (Type, Psittacara leptorhyncha King.) 



Chile. (Monotypic.) 



This genus differs from Microsittace only in the remarkable form of the bill, even 

 the coloration being practically the same. The bill resembles very much that of the 

 Australian Cacatuine genus Licmetis. 



c Microsittace Bonaparte, Rev. et Mag. de Zool., (2) vi, 1854, 150. (Type, Psittacus 

 smaragdinus (jira.e\m=P . ferrugineus Miiller.) 



Southern Chile and Argentina. (Monotypic.) 



d Thectocercus Ridgway, Proc. Biol. Soc. Wash., xxv, May 4, 1912, 99. (Type, 

 Psittacus acuticaudatus Vieillot.) {6t]kt6s, sharp; KepKos, tail.) 



Middle Brazil to Bolivia, Paraguay, Uruguay, and northern Argentina. (Two 

 species.) 



The bill in this genus closely resembles that of Ognorhynchus and Diopsittaca, espe- 

 cially the latter, in its attenuated and acute maxillary unguis, but the maxilla is more 

 swollen laterally, the culmen more rounded, and the maxilla relatively shorter from 

 rictus to tip and truncate or even slightly concave at base beneath (instead of slightly 

 convex). 



