112 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



g. Maxilla broader, much swollen laterally, ita width at base equal to at 

 least two-thirds the length of culmen, the unguis short and broad, 

 its width at base equal to or greater than its length; depth of man- 

 dible at base equal to length of gonys, much greater than that of 

 maxilla at base, the rami relatively short, the base of mandible 

 underneath more shallowly concave; cere much broader and more 

 convex in front of nostril, the lower part strongly receding, more or 

 less tumid, or else (Myiopsitta) with anterior outline nearly straight 

 and nearly covered by flattened antrorse feathers; oil-gland pres- 

 ent, tufted. 

 h. Prefrontal feathers antrorse, forming a flattened fringe covering cere 

 (except anterior margin) and concealing nostrils; anterior outline 

 of cere nearly straight; tarsus much longer than outer front toe 

 without claw; inner webs of eighth and ninth primaries conspicu- 

 ously toothed, that of the tenth (outermost) excised, subtermi- 



nally .' Myiopsitta (extrahmital)." 



hh. Prefrontal antrorse fringe absent, the cere naked (except, some- 

 times, on top, at base of culmen) the nostrils fully exposed; 

 anterior outline of cere strongly convex or the cere nearly cir- 

 cular, with nostril near center, and more or less tumid; tarsus 

 not longer (sometimes shorter) than outer front toe without claw; 

 inner webs of all the primaries normal. 

 i. Cere very tumid, circular; tail nearly four-fifths as long to longer 

 than wing, graduated for more than half its length; tarsus nearly 

 to quite as long as outer front toe without claw; ninth primary 

 longest, the tenth (outermost) little if any longer than eighth; 

 plumage with gray or yellow. 

 j. Feathers of cheeks long, full, semiantrorse, concealing sides of 

 mandible; tail longer than wing; bill smaller and broader, 

 the culmen much shorter than tarsus, not much longer than 

 width of maxilla at base, the tip of maxilla (unguis) very 

 broad and rounded; forehead and crown grayish brown, 

 cheeks, throat, chest, etc., pale gray, primaries green. 



Amoropsittaca (extralimital).* 



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

 murinus Gmelin=P. monachus Boddaert.).— Mywpsittacus (emendation) Salvadori, 

 Cat. Birds Brit. Mus., xx, 1891, 231. 



Bolivia, Argentina, and Uruguay. (Two species, of which only M. monachus has 

 been examined in the present connection.) 



The species of this genus are, apparently, entirely unique in their nesting habits, 

 the nest being suspended from the extremity of a branch, successive nests being 

 added until the accumulated material sometimes weighs as much as a quarter of a 

 ton, each nest consisting of two chambers, a porch or exterior shelter, and a separate 

 room for the eggs, several of these nests being sometimes built in one tree. (See 

 "Argentine Ornithology," ii, 45.) So far as known, all other parrots deposit their 

 eggs in cavities of trees or rocks or excavations in earth banks. 



& Amoropsittaca Richmond, Proc. Biol. Soc. Washington, xxviii, Nov. 29, 1915, 183. 

 (Type, Arara aymara, D'Orbigny.) 



Bolivia, Argentina, and Chilean Andes. (Monotypic?) 



The above characters are based on A . aymara exclusively. In general form and size, 

 and especially in the small, short bill with the sides of the mandible covered (over- 

 laid) by feathers of the cheeks, this genus presents a remarkable general resemblance 

 to the Australian genus Melopsittacus (Subfamily Platycercinse), though the coloration 

 is very different. 



