6. STERNA. 43 



d!" . Lores black. 

 ^'. Kump and tail white ; mantle slate- 

 grey aleutica, p. 98. 



h '. Rump as dark as the mantle ; bill 

 black. 

 y^. Size smaller : wiug about 10'5 

 inches ; uiiderparts white in 

 the younnr. 

 e'''. JNIautle dark smoke-gi'ey .... hmata, p. 100. 



/". Mantle umber-brown ancestheta, p. 101. 



h'. Size larger: wing about 12inches, 

 mantle deep black ; underparts 

 dark brown in the young .... fidiginosa, p. 106. 

 b' . Size smaller : wing less than 8 inches, 

 c". Forehead black to the base of the bill, 



which is also black halcenarum, p. 111. 



d" . Forehead white. 



e'". Lores white nereis, p. 112. 



/'". Lores black. 



i'. Belly white ; bill chiefly yellow, 

 i'. Bill tipped with black. 



y'^. Upper surface of shafts of 



outer primaries white sinensis, p. 113. 



h^. Upper surface of shafts of 



outer primaries dusky. 



e'' . Only the two outer primaries 



darker than the inner quills. 



c*. Bump whitish, much 



paler than the back. . . . 7ninuta, p. 116. 

 d'*. Bump grey, concolorous 



with mantle antillarum, p. 122. 



/■'. Greater part of three outer 

 primaries black, in strong- 

 contrast to the inner quills, saundersi, p. 120. 

 k'. Bill stouter, not tipped with 



black siiperciliaris, p. 124. 



k^. Belly grey ; tail slate-grey like the 



mantle lorata, p. 126. 



B. Crown always white ; nape, orbits, and ear- 



coverts black ; mantle of the palest gTey ; 



wings almost white melanauchen, p. 126. 



C. Crown and nape white, merely a blackish 



streak through the eye ; upper and under 



parts the same tint of grey trudeaui, p. 1.30. 



1. Sterna melanogaster. 



Sterna melanogaster, Temm. PI. Col. livr. 72, pi. 434 (1827) ; Lesson, 

 Traite, -p. 62-2 (1831); Fnmklin, P. Z. S. 1831, p. 125; Jerdon, 

 Madr. Journ. xii. p. 223 (1840) ; Gray, List B. Brit. Mus. p. 179 

 (1844); * Reichenb. JS'atat. tab. x.x. fig. 281 (1848); Bttryes 



* Reichenbach, Schlegel, and others spell the specific name melanogastra ; 

 but as this appears to have been done on no fixed principle, I h;ive placed 

 all the references under melanogaster, as being botli correct and convenient. 



