524 GEOLOGICAL SURVEY OF NEW JERSEY. 



narrow, forked " and with a square blotch or a bar of white near 

 the end. Length, 9^ inches ; tail, 5 inches. 



"Migratory. Moderately abundant throughout the State. 

 Sociable in their habits, when on the wing, flying frequently low 

 down through the streets of our towns. Semi-nocturnal. Their 

 food consists exclusively of insects. Strictly inoffensive." 



Family CYPSELIDiE. 



(Mioropodidffi.) 

 Swifts. 



OH^TDRA, Staph. 



pelagica, L. Chimney Swallow, or Swift. 



Sooty bi-own ; throat paler. Length, 5 inches ; tail, 2 inches. 



" Abundant. Arrive early in April, remaining until late in 

 October. Their nests, as is well known, are generally in chim- 

 neys. Not unfrequently they are in hollow trees, even near a 

 town. They raise three broods generally. Their food is exclu- 

 sively of insects. Strictly inoffensive." 



Family TROCHILID.a:. 



Humming Birds. 



TROOHILUS, L. 



T. oolubris, L. Kuby-throated Humming Bird. 



Bill long; tongue capable of great protrusion; wings long 

 and pointed, the secondaries short, only six in number; rectricea 

 ten; feet very small, with sharp claws; male, metallic green 

 above, chin velvet black ; a ruby-red gorget ; tail deeply forked, 

 Female without red ; tail double-rounded and variegated (green, 

 white and black). Young male resembles adult female ; young 

 female like young male, but no streaks on. throat, and tail more 

 rounded. Length, 3^ inches ; tail, l.J inches ; bill, f inch. 



