240 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



nearly one-third as long as wing, equal to or slightly shorter or longer 

 than middle toe with claw, both sides of the planta tarsi either with a 

 posterior continuous row of large, transverse scutella, or mostly covered 

 with rather small hexagonal scales but with larger obliquely transverse 

 scutella on the upper posterior part of outer side. 



Figure 14. — Dcndrorlyx viacrou-ra. 



Plitiiioge and coloration. — Feathers of pilcum more or less elongated, 

 forming, when erected, a bushy crest of rather narrow to moderately broad 

 soft and decumbent, or decurved feathers, with plane surface and rounded 

 tips ; orbital region and lores more or less extensively naked, especially 

 postocular portion of the former. Coloration rather dull, olive and ru- 

 fescent hues predominantly on upperparts, hindneck striped with chestnut, 

 underparts dull olive-grayish more or less streaked with chestnut or 

 dusky, the throat uniform black, gray, white, or buffy white. Sexes alike 

 in coloration. 



Range. — Southern Mexico to highlands of Costa Rica. (Three species 

 with eight races.) 



KEY TO THE ADULTS OF THE FORMS OF DENDRORTYX 



a. Chin and throat gray, breast uniform chestnut (mounlain forest of Veracruz). 



D. barbatus (p. 241) 

 aa. Chin and throat white or black, breast gray streaked with blackish or brownish. 

 b. Chin and throat white. 

 c. Streaks on breast almost blackish or at least tipped and edged with blackish 



(highlands of Costa Rica) D. leucophrys hypospodius (p. 252) 



cc. Streaks on breast chestnut to auburn (highlands of Guatemala, El Salvador, 

 Honduras, and northwestern Nicaragua). 

 d. Auriculars brown ; ground color of underparts bufify brown ; gray of 

 breast pale (Vera Paz, Guatemala) .D. leucophrys leucophrys (p. 249) 



