BIRDS OF NORTH AND MIDDLE AMERICA. 813 



Adult male.— hength (skins), 188-192 (191); wing, 87.5-91 (89.7); 

 tail, 70.5-76.5 (73.8); exposed culmen, 24.5-25.5(25); tarsus, 24.5- 

 2G (25.2); middle toe, 15.5-16 (15.8).« 



Adult female.—J^ength (skins), 170.5-188 (180) ; wing, 79-88.5 (82.5) ; 

 tail, 61-72 (64.5); exposed culmcn, 23.5-24.5 (23.8); tarsus, 24-26 

 (25.2); middle toe, 15-16 (15.5).'' 



Island of Cozumel, Yucatan. 



Atlila cozumdx Ridgway, Descr. New Sp. Birds from. Cozumel, Feb. 2(3, 1885, '^ 

 (CozAimel I., Yucatan; coll. U. S. Nat. Mus.); Proc. Biol. Soc. Wadiiuglon, 

 iii, 1885, 23; Proc. U. S. Nat. Mus., viii, 1885, 572 (Cozumel I.; descrip- 

 tions; crit.). — ScLATER, Cat. Birds Brit. Mus., xiv, 1888. 362, part (Cozu- 

 mel I., Yucatan). — S.\lvin and Godman, Biol. Centr.-Ain., Aves, ii, 1891, 

 134 (Cozumel I.).— Salvin, Ibis, 1889, 364 (Cozumel 1.; cril.j. 



[Attila^ cozumdad Sharpe, Hand-list, iii, 1901, 169. 



Attila sp.? Salvix, Ibis, Apr.. 1885, 191 (Cozumel I.; crit.; habits).. 



Genus HYLONAX Ridgway. 



Hylonaxc Ridgway, Proc. Biol. Soc. Wash., xviii, Sept. 2, 1905, 210. (Tj-pe, 

 Mylarchxs ralidus Sclater.) 



Superiicially resembling the more stoutly built species of the 

 Tyrannine genus MyiarcJius, but tarsal envelope non-exaspidean, the 

 planta tarsi consisting of a single continuous row of rather large, quad- 

 rate scutella, separated from the inner edge of the acrotarsium b}' a 

 narrow nonscutellate space; bill relatively longer and narrower, cul- 

 men straighter, but more a])ruptly decurved terminally, the tip of 

 maxilla more strongly uncinate; gonys more convex, more prominent 

 basally, and more ascending terminally. 



Bill as long as head, narrowly conical or sid)terete, its width at 

 frontal antite decidedly less than half the length of exposed cidmen 

 (about equal to half the distance from nostril to tip of maxilla); cul- 

 men straight to near tip, where strongly and rather abruptly cVcurved, 

 the tip of maxilla strongly uncinate; lower outline of mandible 

 strongly convex, the gonys ascending rather ra})idly from its promi- 

 nent basal angle; nostril small, roundish or oval, without ol)vious 

 marginal membrane, showing through or in front of bristly latero- 

 frontal plumules, the latter, together with those of chin, mor'erately 

 developed; rictal bristles well developed. Wing moderate or rather 

 long, moderately rounded, the primaries exceeding secondaries by 

 about length of bill; eighth, seventh, and sixth primaries longest, 

 the outermost (tenth) about equal to fourth or slightly shorter. Tail 

 nearly as long as wing, even or ver}' slightly rounded. Tarsus slightly 

 longer than exposed culmen, rather slender, its scutellation quasi- 

 liolasj)idean, the planta tarsi consisting of a single continuous series 

 of about 10 rather large and very distinct quadrate scutella, separated 



a Three specimens, & Six specimejis. c'^A.^, forest; a*'a|, king. 



