i 882.] 
99 
Analyses of Books. 
These remains, especially the presence of Termites, point to a 
much warmer climate than that qt Florissant at the present day. 
The next memoir is a division of the genus Sciurus , by Dr. 
E. L. Trouessart. 
The two next papers — the Osteology of the North-American 
Tetraonidae, and the Osteology of Lanius Ludovicianus var. Ex- 
cubitorides, both by Dr. R. W. Shufeldt — we have already received 
by the courtesy of the author, and have noticed them accord- 
ingly. 
There are further included in this volume a review of the 
Miocene Rodents of North America, and of the Canidae of the 
Loup Fork Epoch, by E. D. Cope; and a paper by A. S. Pack- 
ard, on a Crayfish from the Lower Tertiaries of Western 
Wyoming. 
Osteology of the N orth- American Tetraonidce . By Dr. R. W. 
SCHUFELDT, U.S.A. 
This pamphlet is a reprint from the “ Bulletin of the United 
States Geological and Geographical Survey ” (Vol. vi., No. 2). 
The author, in the memoir befores us, confines himself to the 
family of the Tetraonidae, or true grouse, as distinguished from 
the Odontophorinae, the partridges and quails. In grouse North 
America is very rich, having representatives of the six genera 
Tetrao , Centrocercus, Pedicecetes y Cupidonia , Bonasa , and Lago- 
pus. The author makes a very complete examination of the 
osteology of characteristic species of these six genera. His 
principal conclusion is that though — if we judge solely by out- 
ward appearance and structure— the American Tetraonidae are 
well classified as they stand, yet that, judging from a purely 
osteological point of view, there is no valid reason why Pedice- 
cetes and Cupidona should be referred to distinct genera. In 
their skeletons they are closely alike, whilst differing to a very 
marked degree from the other genera of the family. With com- 
mendable caution the author proposes to defer judgment pending 
a full examination of the structure of these birds in other 
respects. 
Such monographs as the present are literally priceless data for 
the systematic naturalist. 
We must call particular attention to the excellence of the 
illustrations. 
