114 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



6. Maxilla much, broader than deep, swollen laterally, its tomia strongly pro- 

 duced, shallowly excised distally, a broad angular lobe overhanging base of 

 palatal surface of unguis, the latter very deeply excavated or concave and as 

 wide at base as it is long; nostrils near top of cere, opening as much vertically 

 as laterally; claw of outer anterior toe very broad, its inner edge strongly pro- 

 duced Graydidascalus (extralimital).o 



66. Maxilla much narrower, not wider (usually not as wide) as deep, not swollen 

 laterally, its tomia not strongly produced, usually notched and "toothed," 

 the palatal surface of the unguis not deeply excavated and (usually at least) 

 longer than broad; & nostrils farther from top of cere, opening laterally, rela- 

 tively smaller; claw of outer anterior toe normal, 

 c. Smaller (wing less than 125 mm.); maxilla narrower, less strongly decurved 

 and less compressed terminally, its tomia not notched nor "toothed," but 

 with a long terminal concavity or sinus and a slight angle or lobe near middle, 

 or else with the post-ungual notch and angle very slight; palatal surface of 

 unguis deeply concave; lateral outline of cere not strongly sinuated (some- 

 times nearly straight), the lower portion well forward; nostrils posterior to 

 middle of cere; under tail-coverts extending nearly (sometimes quite) to tip 

 of tail. 

 d. Bill more slender, the depth of maxilla at base equal to much less than half 

 the length, of culmen, the latter less strongly decurved; tarsus as long as 

 outer front toe without claw; tenth (outermost) primary with inner web 

 emarginate near tip; orbital region mostly feathered; rectrices wholly 



green; smaller (wing less than 95 mm.) Nannopsittaoa (extralimital). " 



dd. Bill stouter, the depth of maxilla at base equal to half the length of culmen, 

 the latter more strongly decurved; tarsus much shorter than outer front 

 toe without claw; tenth (outermost) primary with inner web not emargi- 

 nate; orbital region wholly naked; rectrices (except middle pair) purple, 

 red, golden, or yellowish, usually with a black terminal or subterminal 

 bar; larger (wing more than 100 mm.) TJrochroma (p. 196). 



" Graydidascalus Bonaparte, Rev. et Mag. de Zool., (2) vi, 1854, 147. (Type, Psitta- 

 cus viridissimus Swainson=P. brachyurus Temminck.) — Oraydidactylus (emendation) 

 Bonaparte, Naumannia, 1856, Consp. Psittacorum, genus 27. — Pachynus Reichenow, 

 Journ. fiirOrn., 1881, 352. (NewnametoreplaceG'roy&tecaZtwongroundsofpurism.) 



Upper Amazon Valley. (Monotypic.) 



It is very difficult to fit this peculiar form into the "key' - satisfactorily, its exact 

 relationships not being very evident. In the nearly straight lateral outline of the cere 

 it resembles Brotogeris, TJrochroma, etc., but the bill is otherwise very different, not 

 only from that of the genera mentioned but from all others. 



6 While perfectly obvious to the eye, it is nevertheless exceedingly different to for- 

 mulate terms clearly indie? ting the many differences in the form of the bill in this 

 group of genera as compared with Graydidascalus. 



« Nannopsittaca Ridgway, Proc. Biol. Soc. Wash., xxv, May 4, 1912, 100. (Type, 

 Brotogerys panychlorus Salvin and Godman.) (y&wos, dwarf; tf-m-dinj, a parrot.) 



British Guiana. (Monotypic.) 



The type and only known species of this genus has usually been placed in Bolbor- 

 hynchus, though sometimes in Psittacula; but why, in either case, is quite beyond my 

 comprehension. It is evidently related to both Brotogeris and Urochroma, but is very 

 distinct from either. In size and general form, and especially in the form of the bill, 

 there is a remarkable resemblance to the Indo-Malayan genus Loriculus Blyth, a 

 member of the Pateornithinse ( = Conurinse). 



