44 NORTH AMERICAN BIRDS. 



and tail ; lower parts exquisitely delicate pale 

 peach-blossom pink, fading into pure white in 

 dried skins ; entire top of head, with nape, uni- 

 form deep black ; bill black, tinged at base (in 

 life) with reddish ; feet bright red in life. 

 Winter adult : Similar, but forehead and anterior 

 part of crown white, the latter tinged with 

 grayish and indistinctly streaked with blackish. 

 Young : Pileum and nape pale buffy grayish, 

 finely mottled or sprinkled with darker, and 

 streaked, especially on crown, with dusky ; or- 

 bital and auricular regions dusky blackish; 

 remainder of head, and entire lower parts, white, 

 the nape and sometimes side of breast finely 

 mottled with bufiy gray; pale pearl-gray of 

 back and scapulars overlaid by pale buff, irregu- 

 larly mottled with dusky, each feather with a 

 submarginal dusky U-shaped mark; bill brown- 

 ish dusky; feet dusky (in dried skins). Length 

 14.00-17.00, wing 9.25-9.75, tail 7.25-7.75 (forked 

 for 3.50-4.50), culmen 1.50, depth of bill at base 

 .35, tarsus .85, middle toe .75. Eggs 2-4, 1.66 X 

 1.21, similar to those of S. paradiscea, but ground- 

 color averaging lighter and markings smaller. 

 Hob. Atlantic coast of United States; "West 

 Indies, and various parts of Old World. 



72. S. dougalli MONTAG. Roseate Tern. 



e 2 . Top qf head black, with a broad white patch on forehead, ex- 

 tending backward on each side of crown to above eyes ; a 

 black stripe across lores. 



Summer adult: Above deep plumbeous-gray, beneath 

 paler, more lavender-gray ; tips of secondaries, upper 

 and lower tail-coverts, tail, sides of head, chin, under 

 wing coverts and axillars pure white; bill and feet 

 entirely deep black. Winter adult, unknown. Young : 

 Forehead, lores, crown, and entire nape, smoky gray- 

 ish brown, deepening on occiput into dark sooty, this 

 color extending laterally nearly or quite to eye ; the 

 smoke-color of nape extending laterally over side of 

 neck and breast, or sometimes even tingeing the jugu- 

 lum and fore-neck ; back, scapulars, inner wing-coverts, 

 and tertials dull slate-blackish, broadly and sharply 

 bordered terminallj 7 with yellowish ochraceous ; upper 

 rump dark brownish slate, feathers narrowly tipped 

 with pale fulvous, this preceded by a dusky subter- 



