BIRDS OF XORTH AXD MIDDLE AMERICA. 147 



dd. Exposed culmen less than one-third as long as wing. 

 e. A web between inner and middle (as well as between outer and middle) toes. 



/. Tarsus more than one-third £^s long as wing Micropalama (p. 204). 



ff. Tarsus not more than one-fourth as long as wing Ereunetes (p. 209) 



ee. No web between inner and middle toes Machetes (p. 218). 



cc. Anterior toes cleft to the base (no webs). 

 d. Hallux present. 



e. Bill not distinctly if at all expanded terminally. 

 /. Feathering on lores extending to nostrils, that on malar region extending 

 nearly as far forward as anterior «nd of nostrils; inner webs of remigcs 



marbled or freckled Tryngites (p. 225). 



ff. Feathering on lores not extending to nostrils, that on malar region not 

 extending beyond posterior end of nostrils; inner weljs of rcmiges not 

 marbled or freckled. {Eroliie.) 

 g. Middle pair of rectrices not longer than the rest; tail less Ihan two- 

 fifths as long as wing Canutus (p. 230). 



gg. Middle pair of rectrices distinctly longer than the rest; tail at least 

 two-fifths as long as wing. 

 h. Exposed culmen longer than tarsus. 

 i. Bill stouter; tarsus less than one-fifth as long as wing, shorter than 



middle toe and claw Arquatella (p. 238.) 



il. Bill more slender; tarsus more than one-fifth as long as wing, 

 longer than middle toe and claw. 

 j. Bill distinctly decurvcd distally; middle toe, with claw, less 



than three-fourths as long as tarsus Erolia (p. 249). 



jj. Bill not distinctly decurved distally; middle toe, with claw, 



four-fifths as long as tarsus Pelidna (p. 256). 



hh. Exposed culmen shorter than tarsus Plsobia (p. 266). 



ee. Bill conspicuously expanded (paddle-shaped) terminally. 



Eur3morhynchus (p. 302). 



dd. Hallux absent Calidris (p. 307). 



hb. Nasal fossae relatively narrow posteriorly, continued anteriorly as a broad 

 groove for not more than two-thirds the length of the maxilla, or else {Actitis) 

 inner web of remiges crossed by a broad band of white spots. ( Tmiginx.a) 

 c. Bill not at all decurved distally. 

 d. Tail shorter than tarsus (much less than half as long as wing), not graduated; 

 exposed culmen much more than six-tenths as long as tarsus. 

 e. Nasal groove extending for much less than two-thirds the length of maxilla; 

 inner webs of remiges not crossed by a white band. 



" According to Lowe (Ibis., 1915, 612) the Tringinoe are easily distinguished from 

 the Eroliinoeby the following osteological characters: Distal end of premaxilla more 

 elongated and pointed, less elastic, and with slit-like depressions instead of pits; 

 pterygoid processes long, ribbon-shaped, more parallel toward pterj^gold articulation; 

 maxillo-palatine process extending backward on either side of vomer, as a very- 

 attenuated pjTiform or sac-like process, free for greater part of its course; inwardly 

 projecting plate of maxillary not distinctly if at all fenestrated; line of culmen gradu- 

 ally ascending to nasal region, where abruptly inclined upward; zygomatic arch or 

 quadra to-jugal rod not malcing a distinct angle with maxillary process of premaxillary ; 

 supraorbital grooves conspicuous; postarticular process of mandible not hook-shaped; 

 supra-occipital portion of skull (viewed from above) conical. 



The genera Bartramia, Numenius, Phxopus, and Mcsoscolopax were not examin- 

 ed by Mr. Lowe, and may not belong to this group, in which I place them tenta- 

 tively; Tryngites and Limosa, for the same reason, being provisionally referred to the 

 Eroliinae. 



