BMgway — Diagnoses of New Genera of American Birds. 99 



refers to the " Rivista Contemp. L857, p.!*," as cited by Waterhouse. 

 Unfortunately I am not able to consult tbe latter, however, which, 

 according to Dr. Richmond, is not in any Washington library. 



Micrococcyx gen. nov. 



Type, Coccyzus pumilus Strickland. 



Differing from Coccyzus Vieillot in much shorter and more rounded 

 wing-tip, the longest primaries exceeding distal secondaries by only one- 

 fourth the length of wing, the ninth primary shorter than fourth, the 

 tenth (outermost) much shorter than distal secondaries; tail very little 

 longer (sometimes shorter) than wing, slightly rounded or nearly truncate. 



( ~SltKp6s, small; k6kkv£, a cuckoo.) 



Species: ( 1) Micrococcyx pumilus (Strickland) ; (2) Micrococcyx ciner- 

 , us ( Vieillot). 



Diopsittaca gen. nov. 



Type, Psittacus nobilis Linnaeus. 



Differing from Ara in much smaller size (wing less than 300 mm.); 

 bill much broader, more swollen laterally, the width of maxilla at base 

 equal to much more than half the length (chord) of culmen, the great- 

 est width of mandible equal to length (chord) of gonys; maxillary 

 unguis extremely attenuated and acute (as in Ognorhynchus Gray); tail 

 shorter than wing, and cheeks normally feathered. Differing from 

 Ognorhynchus in naked lores, absence of an exposed post-mandibular 

 naked area, and other characters. 



i Aibs, noble; ^iTTdK-r], a parrot.) 



Species: (1) Diopsittaca nobilis (Linnaeus); (2) Diopsittaca hahni 

 ( Souance). 



Orthopsittaca gen. nov. 



Type, Psittacus manilalus Boddaert (P. makawaunna Gmelin). 



Differing from Ara Cuvier in relatively much smaller bill, with culmen 

 very slightly if at all longer than outer hind toe with claw; anterior late- 

 ral outline of cere straight or very faintly concave, without convexity in 

 front of nostril ; excision of mandibular tomium deep and narrow; cor- 

 rugations on palatal surface of maxillary unguis obsolete, and sides of 

 forehead naked. 



('O/>06s. straight; ^Itt&kti, a parrot.) 



Species: Orthopsittaca manilata (Boddaert I. 



Thectocercus gen. nov. 



Type, Psittacus acnticaudatus Vieillot. 



Differing from Conurus Kuhl in having the maxilla swollen laterally, 

 much wider than deep at base, broadly arched in transverse section, 

 its tip attenuated, acute, and ridged; feathers of cheeks narrow, dis- 



