BIRDS OF NORTH AND MIDDLE AMERICA. 343 



h. Bill larger, stronger, and broader; anterior toes more extensively- 

 united basally, the middle toe united lo outer for whole of its basal 

 and part of its second phalanx, to innerfor more than half the length 

 of its basal phalanx; tenth (outermost) primary equal to or longer 

 than fifth, the barbs of its outer web stiffened and recurved ter- 

 minally, in adult males « Craspedoprion (p. 385) 



/(/(. Bill smaller, weaker, and narrower; anterior toes more deeply cleft, 

 the middle one united to outer for less than entire length of its 

 basal phalanx, and to inner for little if any more than half the 

 length of its basal phalanx; tenth (outermost) primary shorter 

 than fifth (sometimes shorter than first), its outer web with barbs 



normal Khynchocyclus (p. 389) 



q. Width of maxilla at posterior end of nostrils equal to less than length of 

 gonys, or else {Legatus, Tyrannopsis) the latter much shorter than 

 distance from nostril to notch of maxillary tomium. 

 h. Bill relatively small and short, the exposed culmen shorter than mid- 

 dle toe with claw, or else the latter as long as tarsus or very little 

 shorter. 

 i. Bill more slender, its width at frontal antia; equal to less than two- 

 thirds the distance from nostril to tip of maxilla. 

 j. Basal phalanx of middle toe only about half united to outer toe, • 



mostly free from inner toe Serpophaga (p. 395) 



jj. Basal phalanx of middle toe almost wholly united to outer toe, 

 about half united to inner toe. 

 k. Larger (wing more than 60 mm.); bill more tapering termi- 

 nally, deeper (nearlyjas deep as broad) basally; nostril round 

 ish, with narrow superior membrane; no distinct wing- 

 bands; crown with a yellow or white patch. 



Myiopagis (p. 398) 

 Ick. Smaller (wing less than 60 mm.); bill less tapering termi- 

 nally, more depressed (much broader than deep) basally; 

 nostril narrow, with broad superior membrane; broad yel- 

 low wing-bands; crown without yellow or white spot. 



Pogonotriccus ? (extralimital) b 

 li. Bill thicker, its width at frontal anti;e equal to more than two- 

 thirds the distance from nostril to tip of maxilla. 

 .^. Smaller (wing not more than GO mm.). 



h. Tail much more than three-fourths (usually more than four- 

 fifths) as long as wing; anterior toes more deeply cleft, the 

 basal phalanx of middle toe united to outer toe for less than 

 entire length; bill more depressed basally, its depth at 

 frontal antiaj much less than its width at same point; nostril 



in anterior end of nasal fossa? Tyranniscus (p. 405) 



M. Tail not more (usually less) than three-fourths as long as 

 wing; anterior toes more extensively coherent basally, the 

 middle toe united to outer for whole of its basal phalanx; 

 bill deeper basally, its depth at frontal antiaj equal to its 

 width at same point ; nostril near center of nasal fossa\ 



Camptostoma (p. 411) 



« As in the hirundine genera Stelgidopleryx and Psalidoprocne. 



b rogonotnccus Cabanis and Heine, Mus. Hein., ii, 1859, 54. (Type, Muscicapa 

 eximia Temminck). — Eupsilostonm Sclater, Proc. Zool. Soc. Lond., I860, 68. (Same 

 type.) 



The above characters are taken from Pogonolriccus alleni Oberholser, a species which 

 may or may not be congeneric with P. eximius, which I have not seen. 



