60 Synopsis of the Birds 



Male, three outer tail feathers pure white at tip. 



Female, tip of the outer tail feathers ochreous. 



Whip-poor-will, Caprimnlgus vociferus, Wils. Jim. Orn. v. 

 p. ix.pl. 41. fig. 1. male, 2. female, 3. young recently hatched. 

 C. virginianus, Vieill. nee auct. 



Inhabits the United States during summer : far less com- 

 mon than the following in the middle and northern states. 



69. Caprimulgus virginianus, Biiss. Bill without bristles ; 

 tail forked, not reaching to the tips of the v\ings; primaries 

 plain blackish, with a white spot. 



Male, triangular spot on the throat, and band on the tail, 

 white. 



Night-Hawk, Caprimvlgus americanus, Wils Am. Orn. v. 

 p. 65. pi. 4' .fig. 1. male. 2. female. C. popetue, Vieill. 



Inhabits the United States during summer, common in 

 the middle states. 



DTURNAL. 



Eyes and ears moderate. Plumage close and compact 

 Middle toe nail not pectinated. 



14. CYPSELUS. 



Hirundo L. P>?'iss. Gm. Lath. Cuv. Hirundo, Cypselus, 

 111. Vieill. Ranz. Jipus, Scopoli. Cuv. (subg.) Alio opus, 

 Wolf. Meyer. Brachypus,J\hyer. Cypselus, Temm. 



Bill extremely short, triangular, cleft to the eyes ; upper 

 mandible slightly notched near the tip, which is rather 

 obtuse ; lower somewhat shorter, and a little recurved at tip: 

 nostrils lateral, approximate, large, partly covered by a 

 feathered membrane, leaving a small tubular aperture : tongue 

 short, wide, cartilaginous, bifid at tip. Feet remarkably 

 short ; toes divided ; hind toe versatile, generally directed 

 forward; middle toe a little longer than the lateral sube- 

 qual ones ; hind toe shortest : nails very retractile, beneath 

 canaliculated ; the middle one largest; hiud. nail smallest. 



