2 26 RiDGWAY, Nezv Genera and Species of American Birds. Ljuly 



Genus Rhodothraupis. (Type, Fringilla celceno Lichtenstein.) 



Similar to Caryothraustes Reichenbach, but tail much longer (nearly 

 as long as wing) and decidedl}- rounded; first primary not longer than 

 eighth instead of longer than seventh ; tarsus decidedly longer than middle 

 toe with claw, and sexes different in color, though similar in pattern of 

 coloration. 



Genus Hemithraupis. (Type, Aglaia cyanocephala Lafresnaye 

 and D'Orbigny.) 



Similar to Tanagra Linnseus,' but tail much longer (equal to length 

 of wing to tip of secondaries), wing more rounded (first primary shorter 

 than seventh instead of longer than sixth), and rictal bristles much 

 stronger. 



Ganus Stelgidostomus. (Type, Saltator maxillosus Cabanis.) 



Superficially closely resembling Saltator Vieillot, but bill very diff'er- 

 ent, being much shorter and more tumid, with maxillary tomia strongly 

 inflected, the mandibular tomia serrated, especially toward the base, and 

 the inferior surface of the maxilla with a lateral series of sharp, trans- 

 verse file-like ridges or corrugations. 



Aimophila^ ruficeps sororia. Laguna Sparrow. 



Similar to A. ruficefs in coloration ,of upper parts, but chestnut of 

 pileum somewhat lighter or clearer, supraloral lihe Avhiter, and supra- 

 auricular stripe lighter and grayer; smaller than A. ruficeps scottii, with 

 back, -etc., less ashy with chestnut streaks darker and much narrower, and 

 the under parts much more strongly tinged with buff; differing from all 

 the other northern forms of the species in much thicker and relatively 

 shorter bill. Wing, 2.20-2.4S (2.37) ; tail, 2.40-2.5S (2.49) ; exposed culmen, 

 0.45; depth of bill at base, 0.25-0.27 (0.26) ; tarsus, 0.80-0. Si (o.So) ; middle 

 toe, 0.55-0.60 (0.58). 



'The type of Tanagra Linnaeus is, according to the "process of elimina- 

 tion," T. episcopiis. 



- 1 am at present unable to discover any characters sufficient to separate 

 Peuccea from Aitnop/iila, unless the former be restricted to P. cBstivalis, P. 

 hotteri, and P. cassini. Ainiophila ruficeps is connected with the type {A. 

 rtcficanda) by such intermediate species as A. tncleodi, which Mr. Brewster 

 described as an Ainiophila and Messrs. Salvin and Godman as a Peucaa {P. 

 niegarhyncha). , 



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