ZOOLOGICAL LITERATURE. 
32 
^ griseqflavuSf from Guatemala, p. 427 ] M. leucops, from Mexico, p. 427 j M. 
fumigatus, from the Upper Amazons, p. 428 j M. hrunneonigerj from Brazil, 
p. 429; M. xanthotus, from Central America, p. 429; M. ignitus, from 
Bolivia, p. 429; M. gHseogena^ from Central America, p. 429; M. leuco^ 
gaater, from Bolivia and Brazil, p. 430 ; M, fraseii, from Ecuador, p. 430 ; 
M. tephrogaster and M. tcetiiuruSj from Central Americoj p. 431 ; M. irro- 
ratuSf from the Upper Ucayale, p. 431 ; M. Jlavivmter, fi*om Brazil, p. 432. 
ATamias. Dr. Gray (/. c.) characterizes seven species of this genus, T. 
guadrimaculatus, from California, being new, p. 436. 
J^Spermophilus dtillus. Notes on the hybernation by F. Tiemann, Zool. 
Gart. 1867, p. 144. The author thinks that the season of copulation is not 
the spring but the autumn (October). 
Spermophilus mmgolicus, sp. n., A. Milne-Edwards, Ann. Sc. Nat. 1867, 
vii. p. 876. 
Dactylomys. Dr. Hensel has made a short communication on this Rodent 
before the Gesellsch. ntrf. Freund. Berl. 1867, Sitzgsber. p. 21. He found 
it in South Brazil. It appears to be related to the Hystricina^ and more 
especially to Chcetomys. 
Hydrochcerus. Remarks on the milk-dentition by Dr. Hensel, in Sitzgs- 
ber. Ges. ntrf. Freund. Berl. 1866 (1867), p. 28. 
/ Dr. Gray has published notes on the skulls of Hares and 
/ Picas in the British Museum, Ann. & Mag. Nat. Hist. 1867, 
' XX. pp. 219-225. He follows Professor Lilljeborg in regarding 
ing them as two distinct groups of the Buplicidentata^ and 
arranges them thus : — 
Fam. Lagomyidje, with Ogotoma {Ogotoma pallasii^Lagomys ogotomd) 
mdi Lagomys (9 species). 
Fam. LeporiduE. 
Sect. I, Skull high, rather compressed. Nose compressed; cheeks 
nearly flat, separated from the orbits by a strong ridgo, and edged above by 
the prominent upper hinder elongated process of the intermaxillaries. Orbits 
large, roundish. Cutting-teeth moderate. 
A. Hares, The hinder nasal aperture of skull broad, deep, rounded 
above, and with nearly erect sides. Young born with the eyes open, and 
the body covered with hair. Living in forms” on the surface of the earth. 
a. Postorbital process more or less soldered with the skull. 
1. Hydrolagus^Lepm § F, Baird. 2 species. 
2. Sylvilagus= Lepus § D, Baird. 3 species. 
3. Bulagos, with L. mediterraneus, and Eulagos judcece^ sp. n., p. 222, 
from Palestine. 
h. Postorbital process separate from the skull. 
4. Lepus— Lepus §§ A & E, Baird. 30 species. 
; 6. Tapeti, With L. hrasiliensis (L.). 
\ B. Rahhits. The hinder nasal aperture of skull narrow, deep, angular, 
contracted above, with sloping sides. Living in burrows. Young bom 
blind and naked. 
6. Cuniculus— Lepus § C, Baird. 1 species. 
Sect. II. Skull conical, subcylindrical ; nose thick; cheeks very con- 
