108 Recent Ornithological Publications. 
careful method as has been previously employed by Mr. Coues 
in his “ Monograph of the genus JEgiothus.” The first of Mr. 
Coues's papers is a “ Synopsis of the North American forms of 
the Colymbidce and Podicipidce.” Of the former family five 
species of the genus Colymbus are recognized as American, that 
is, our three familiar Divers of these shores, and two representa¬ 
tive species, Colymbus adamsi , allied to C. glacialis (as we must 
persist in calling the Great Northern Diver, for we cannot allow 
anything to displace a Linnean name), and C. pacificus, an Ame¬ 
rican form of C. arcticus. It is with great pleasure we see that 
fine bird, Colymbus adamsi , so fully confirmed as a valid species; 
for some doubts* have been cast on its distinctness from C. gla¬ 
cialis. Mr. Coues thinks there cannot be the slightest doubt 
upon this point. “The difference in the size, shape, and 
colour of the bill alone would separate the two, were there no 
other characters involved.” The Smithsonian collection em¬ 
braces a large series of Adams's Diver, obtained in the vicinity 
of Great Slave Lake and Mackenzie's River by those energetic 
collectors, R. Kennicott and B. R. Ross. The Grebes of America 
are arranged by Mr. Coues under nine specific heads. First, we 
have two species of the new genus JEchmophorus (founded on 
Podiceps occidentalis, Lawrence), both from the Pacific coast of 
America. Next follow five species of true Podiceps and its 
various subdivisions. These are 
P, cristatus, 
P. cooperi, 
P. cornutus, 
P. californicus, 
P. holbolli. 
P. cristatus. 
corresponding 
with the P. cornutus. 
European P. auritus. 
[ P. griseigena. 
Finally, we have a single Sylbeocyclus ($. dominicus of the An¬ 
tilles and Mexico), which occurs on the southern confines of the 
United States, and the Podilymbus podiceps, sole representative 
of the distinct subfamily Podilymbince. 
Mr. Coues's second contribution to ornithology which we have 
to notice is a “Revision of the Gulls of North America, based 
upon specimens in the Museum of the Smithsonian Institution.” 
This is an “abstract of a more extended monograph of the 
See P. Z. S. 1859, p. 206. 
