770 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



moderately uncinate; frontal and (except in Ilylonax) rictal 

 bristles less strongly developed; tail decidedly longer than dis- 

 tance from bend of wing to end of distal secondaries; tarsus much 

 less than one-fourth as long as wing, the planta tarsi holaspidean 

 (a single row of large scutella occupying the greater part). 

 i. Upper portion of planta tarsi smooth (normal). 

 j. Bill relatively longer and narrower, the exposed culmen nearly 

 as long as tarsus, more than twice the width of bill at frontal 

 antiee, faintly concave (as in Attila) near middle portion. 



Hylonax (p. 813) 



jj. Bill relatively shorter and broader, the exposed culmen much 



shorter than tarsus (except in Siryctes, part), much less than 



twice the width of bill at frontal antise, not at all concave. 



k. Bill shorter and broader, its width at frontal antise nearly 



equal to length of gonys; pileum and back greenish olive. 



Ramphotrigon (extralimital).a 

 Ich. Bill longer and narrower, its width at frontal antiee much 

 less than half the length of gonys; pileum and back not 

 greenish olive. 



I. Outermost (tenth) primary not shorter than fourth (some- 



times longer) ; color above grayish, with blackish pileum, 

 wings, and tail (the wings with conspicuous white or 

 otherwise light-colored edgings), gray or whitish beneath. 



Sirystes (p. 815) 



II. Outermost (tenth) primary much shorter than fourth; 



color above plain rufous, or brown with rufous pileum and 

 tail, beneath paler, passing into yellowish on abdomen. 



Casiornis (extralimital)^ 

 ii. Upper portion of planta tarsi serrated (the scutella tuberculate 



or spiciform) Lipaugus (p. 818) 



gg. Tarsus relatively shorter (shorter than middle toe with claw, much 

 less than one-fifth as long as wing), the upper portion feathered 

 in front, the planta tarsi pycnaspidean; culmen curved from base. 



Lathria (p. 821) 

 ff. Aspect not Tyrannine, the bill less compressed terminally or else 

 {Tityra) as deep as broad at base, less strongly uncinate (except in 

 Tityra and Erator) and ridge of culmen less distinct, the feathers of 

 frontal antise and chin without distinct if any bristly points, and 

 rictal bristles very weak or obsolete. 

 g. Tail nearly as long as wing; adult male with all the primaries normal. 



Xenopsaris (extralimital)c 



o- Ramphotrigon Gray, Cat. Gen. and Subgen, Birds, 1855, 146 (ex "Pr. B[onaparte] 

 1854"). (Type, Platyrhynchus ruficaudus Spix.) Guiana and Amazon Valley; mono- 

 typic. 



6 Casiornis Des Murs, Orn. Voy. Castelnau, 1855, 55 (ex Bonaparte, MSS). (Type, 

 C. typus Des Mnxs,,= Mnscicapa rubra Yieillot.) Southern Brazil, Paraguay, and 

 Argentina; two species. 



cXenopsaris Ridgway, Proc. U. S. Nat. Mus., xiv, no. 870, Oct. 22, 1891, 479. 

 (Type, Pachyrhamphus albinucha Burmeister.) — Prospoietus Cabanis, Journ. fiir Orn., 

 Jan., 1892,126 (same type). Argentina; monotypic. In spite of the opinion of Doctor 

 Cabanis (loc. cit.), Doctor Sclater (Proc. Zool. Soc. Lond., 1893, 166). and Count von 

 Berlepsch and Doctor Hartert (Novit. Zool., ix, 1902, 36) that this genus belongs to the 

 Tyrannida3. I find on examination of the specimen in the U. S. National Museum 



