BIRDS OF NORTH AND MIDDLE AMERICA. 349 



pp. Smaller (wing less than 85 mm.); exposed cul- 

 men little, if any, longer than tarsus; rictal 



bristles weaker Coryphotriccus (p. 667) 



00. Bill relatively narrower, its width at anterior end 



of nostrils equal to less than half the distance 



from nostrils to tip of maxilla (or else, in Tol- 



mnr chits, the tenth primary longer than fourth), 



the lateral outlines not at all convex; exposed 



culmen longer than tarsus (usually longer than 



middle toe with claw). 



p. Tenth (outermost) primary shorter than first; tail 



shorter than distance from bend of wing to end 



of distal secondaries (not more than four-fifths 



total length of wing); bill narrower and more 



compressed, its width at posterior end of nostrils 



equal to less than half the distance from nostril 



to tip of maxilla and less than one and a half 



times its depth at same point; gonys much less 



than twice as long as mandibular rami; latero- 



frontal feathers dense, forming a compact an- 



trorse tuft covering nostrils; rictal bristles 



weaker; a broad white superciliary stripe; under 



parts bright yellow (throat sometimes white). 



Pitangus (p. 669) 

 pp. Tenth (outermost) primary longer than fourth; 

 tail longer than distance from bend of wing to 

 end of distal secondaries, much more than four- 

 fifths as long as wing: bill broader and more 

 depressed, its width at posterior end of nostrils 

 equal to one-half the distance from nostril to 

 tip of maxilla and one and a half times its depth 

 at same point ; gonys very nearly twice as long 

 as mandibular rami; latero-frontal feathers 

 scant, not forming a distinct tuft, nor hiding 

 nostrils, their bristly tips much longer: rictal 

 bristles larger; no white superciliary stripe: 

 under parts grayish white. .Tolmarchus ( p. 676) 

 iiini. Longer jirimaries attenuated at tip. .Tyrannus (p. 685) 

 ua. Tail fdrlicate. the lateral rectrices much more than twice as long as middle pair. 



Muscivora ( p. 714) 

 Genus COPURUS Strickland. 



Copurus<:^ Strickl.\nd, Proc. Zuol. Soc Lond., 1841. 28. (Type. Muscirapa jili- 

 cauda Spix= 3/. colonim Vi(nllot.) 



Rather small Tvrannitla^ (wing about 70-85 miu.) with very short 

 broad bill (exposed culmen not much longer than the basal width and 

 shorter than middle toe without claw), middle pair of rectrices elon- 

 gated (excessively so in adidt males) and with their webs greatly 

 reduced basalh", and coloration mostly uniform black or dusky. 



Bill very short (exposed culmen decidedly shorter than middle toe 

 without claw), broadly triangular in vertical profile, its w^dth at 



oFrom " Kcbvtf, an oar; ovpd, the tail." 



