628 GEOLOGICAL SURVEY OF NEW JERSEY. 



XEMA, Leaoh. 



X. sabinii, Sab. Sabine's Gull. Forked-tail Gull. 



Much 'like above, but with a black collar and hood ; more 

 black on quills; mantle deeper bluish gray; bill tipped with 

 orange. Length, 13 J inches ; tail, 4| inches, forked for nearly 

 1 inch. Ranges south to New York, casually further south. 



QBLOCHBLIDON, Brehn. 



<3t. nilotica, Hass. (anglica, Mont.,) (Sterna aranea — Abbott's Catalogue.) 

 Marsh Tern. Gull-billed Tern. 



Tail forked; feet black; bill stout (Ij inches); top of head, 

 &c., black in summer, white in winter ; upper parts pearl gray, 

 otherwise white. Length, 16 inches; wings, 12 inches; tail, 5^ 

 inches. 



"Arrive about April 15th. Breed along the coast. Not found 

 inland. Do not associate with other species." 



STERNA, L. 



S. tsohegrava, Lepech. (Thalasseus oaspius, Pall.) Caspian Tern. 



Tail forked for less than a fifth of its length ; adult in spring^ 

 top of head glossy black ; feet black ; bill red ; plumage white, 

 pearl gray above ; after pairing season, white, speckled on the 

 black of head ; winter adult white or grayish, streaked on head ; 

 dark colors more extended in young. Length, 20 inches ; wings, 

 17 inches ; tail, 6 inches. 



"A northern species, only occasionally met with. Is more 

 rarely seen than the sooty tern. Is met with in winter." 



S. maxima. Bodd. (T. regius, Gamb.) Royal Tern. 



Bill orange ; tail forked for half its length ; adult in spring^ 

 top of head and occipital crest and feet, black ; after pairing 

 season, only occipital region black ; in winter, white, mixed with 

 black of occiput; bill paler; young like winter adult, but upper 

 parts spotted. Length, 20 inches; wiugs, 15 inches; tail, 8 

 inches. More slender body than preceding, 



•" Like the preceding, is a rare species. Visits us from the 

 South during the summer. Does not breed in the State." 



