304 
ALLEN'S NATURALIST'S LIBRARY. 
close among the stones, and are then practically invisible. A 
reference to this has been given by Mr. Trevor-Battye in his 
ornithological appendix to “ Ice-bound on Kolguev,” where he 
gives a careful description of the same tactics as pursued by 
the Red-necked Phalarope {Phalaropus hypoboretis). 
I 
ADDENDA TO VOL. 111. 
Page 63 
THE AMERICAN LAUGHING GULL. LARUS ATRICILLA. 
Larus airicilla, Linn. Syst. Nat. i. p. 225 (1766); Saunders, 
Man. Brit. B. p. 646, note (1889) ; id. Cat. B. Brit. Mus. 
XXV. p. 194 (1896). 
(Plate CXXIV.) 
Adult. — Similar to L. ridibt/ndus, but distinguished by its 
black head, dark slate-grey mantle, and its black outer 
primaries. Total length, 16-5 inches; wing, 13-0. 
Range.— North America, migrating south to Guiana, Brazil, 
and Northern Peru. 
This species was figured in Jardine’s “ Naturalist’s Library,” 
and I have thought it advisable to republish the figure. One 
specimen is said to have been procured at Winchilsea, but this is 
disallowed by Mr. Saunders, who says that there is no authentic 
record for the species in England or any part of Europe. 
Page 182. 
° COLYMBUS ADAMSI. 
During a recent visit to Manchester, I found a young bird of 
this species in the very interesting collection of Mr. Bulkeley 
Allen at Altrincham. The specimen was shot at Achaglachgach, 
Loch Fyne, by a keeper named Ebenezer Burgess, late in the 
autumn of 1893. 
ADDENDUM TO PRESENT VOLUME. 
Page 255, line 8 from bottom. Read “ Turtur arenicola." 
