4 BRITISH BIRDS. [VoL. XI. ; 
Correspondence with several ornithologists has shown 
that the Rules for Nomenclature are so interpreted by the 
Members of the International Commission, that we must fall 
into line and adopt the above changes. 
Hirundo Linneeus, Syst. Nat. Ed. X., I., p. 191, 1758, type 
by subsequent determination (Gray, 1840) Hirundo rustica L. 
Delichon Moore, Proc. Zool. Soc. London, XXII. (** 1854 ”’), 
p. 104 (1855—Monotype: D. nipalensis Moore).—HE. H. 
Add— 
324a. Puffinus assimilis boydi Math.—THE CAPE 
VERDE LITTLE SHEARWATER, 
See Brit. B., TX., p. 208. 
Add— 
326a, Puffinus kuhlii borealis Cory—-THE NORTH 
ATLANTIC GREAT SHEARWATER, 
See Brit. B., [X., p. 208. 
For the same reasons as those given under the Swallows 
the generic name of the Grebes (Nos. 336, 337, 338, 339, 340), 
must be Popticeps instead of Colymbus and the Divers (Nos. 
341, 342, 343, 344) must again be called CoLymsBus instead 
of Gavia. 
Podiceps Latham, Gen. Syn. B., Sup pl., L., p. 294 (1787— 
Type by subsequent determination (Gray 1840): P. 
cristatus (L). 
Colymbus Linnzus, Syst. Nat., Ed. X., I, p. 1385 (1758— 
Type by subsequent determination (Gray 1855) Colymbus 
arcticus L.).—E. H. 
Add— 
CHARADRIUS SEMIPALMATUS 
358a. Charadrius semipalmatus Bp.—THE SEMI- 
PALMATED RINGED PLOVER. 
See Brit. B., X., p. 262. 
371. Erolia canutus canutus (L).—THE KNOT, 
instead of Canutus canutus (L.). 
From the point of view from which the genera are limited 
in the Hand-List, there is no reason whatever why the Knot 
should be placed in a separate genus. There is no more 
difference between the Purple Sandpiper and the Knot,- for 
example, than between the Dunlin and the Purple Sandpiper. 
To place the British species of Hrolia into four or five genera 
as has been done by some writers seems to us useless and 
