Allen’s naturalist’s library. 
S6 
Hungary. It has been known to occur off the mouth of the 
Somme in Northern France, and there is, therefore, nothing 
lemarkablc in the fact that it should occasionally turn up in 
England. 
Habits. Scarcely any notes have been recorded respectin'’' 
the habits of this Gull, which has been found in colonies in 
various parts of the Mediterranean, and apparently nests in 
many places within this area, though up to the present the 
eggs found by Mr. Dresser and other ornithologists in Spain 
have turned out to be those of the Gull-billed Tern, with the 
flocks of which Z. melanocephalus often mingles. 
Nest. — yet undescribcd. 
Eggs— Three in number, varying very much in colour, the 
ground tint of some being light clay-brown or buff, while 
others are very dark chocolate or olive-brown. The spots and 
blotches are darker brown, and the underlying markings are 
light purplish-grey. Axis, r9-2-i5 inches; diam. i‘4-r5. 
IV. Bonaparte’s gull, larus Philadelphia. 
Stcf HCt Philadelphia^ Ord. in Gutlirie’s Geogr. 2nd Anier ed ii 
p. 319(1815). 
Gavia boiiapartii (Sw. & Rich.) Macgill. Lrit. Ij. v. p 6iq 
(1852). 
Larus Philadelphia, B. O. U. List Brit. B. p. 192 (1883)- 
Saunders, ed. Yarrell’s Brit. B. iii. p. 584 (i 884) ; Seebohm’ 
Hist. Brit. B. iii. 1^307 (1885); Saunders, Man. Brit, b! 
p. 645 (1889) ; Lilford, Col. Fig. Brit. B. part xxix. (1804) • 
Saunders, Cat. B. Brit. Mus. xxv. p. 185 (1896). 
Adult Male. General colour above pearly-grey, including the 
wing-coverts ; all the coverts round the bend of the wing, bastard- 
wing, and primary-coverts pure white ; first four primaries white 
with black end.s, the first one black along theouter web, the second 
slightly shaded with grey on the inner web, the third and fourth 
more distinctly grey on the latter, the rest of the ])rimaries grey, 
with black near the tips, which show a small terminal grey spot’ 
the black decreasing in extent towards the inner primaries • 
secondaries grey, with narrow white edges to some of the inner 
ones ; lower rump, upper tail-coverts, and tail white ; head all 
