1 8S3.] Brewster on an apparently New Gull. 2 I Cj 
bring together from other sources a number of examples of L. 
glaucus and L. leucopterus , and two more L. glaucescens . 
A critical study of this material has resulted in the following 
conclusions: (i) That the Gulls from Grand Menan and the 
Bay of Fundy are identical with the Cumberland Sound speci- 
men. (2) That they represent a form distinct from L. glauces- 
cens. (3) That this form is not referable to any species or 
variety now recognized by the best authorities on Lari dee. 
Before going further it is necessary to revert to a Gull which 
has given systematists no little trouble ; this is Larus ckalcop- 
terus. The name was instituted* * * § by Lichtenstein in 1854, with- 
out accompanying characterization. In the following year 
Bruch identified with it a Gull of which he gives the following 
brief description : -f- “Wholly similar to the preceding [i. e. L. 
leucopterus~\ except in the primaries, which are ash-gray with 
round white terminal spots. The young plumage, as with L. 
glaucopterus [ — L. glaucescens] , is dark gray. Habitat, 
American Coast of Behring’s Straits and Greenland.” 
This description, as far as it goes, agrees well with the bird 
which we are about to consider, but let us trace the history of 
ckalcopterus a little further. 
It was admitted as a valid species by Lawrence in 1858,! and 
similarly acknowledged by Coues in 1862, § but the latter author 
has recently united it with L. glaucescens, || remarking that 
“ there is not the slightest likelihood that it is anything more 
than glaucescens, probably in somewhat immature condition.” 
Neither Lawrence nor Coues claimed to have seen specimens of 
ckalcopterus, but Saunders has been more fortunate. He exam- 
ined Lichtenstein’s type, which turned out to be merely an exam- 
ple of L. leucopterus. Concerning Bruch’s bird he was evidently 
in doubt, for a ? is prefixed to the reference which is given among 
the synonyms of leucopterus ; while the ckalcopterus of Lawrence 
and Coues is placed under glaucescens. 
The gist of all this seems to be that the original Larus ckal- 
copterus was simply A. leucopterus. As to Bruch’s ckalcopterus 
* Nomencl. Av. Mus. Berol., p. 99, 1854. 
f J. f. Orn., 1855, p. 282. 
t B. N. A., 1858, p. 843. 
§ Proc. Phila. Acad., 1862, p. 295. 
|| Birds N. W., pp. 622, 624.J 
Proc. Zool. Soc. of London, Feb. 5, 1878, pp. 166, 167. 
