1896.] GENERA OF RODENTS. 1023 
X. Bathyergide. 
109. Bathyergus, Ill. 
Prodr. Syst. Mamm. p. 86 (1811). 
110. Georychus, Il. 
Prodr. Syst. Mamm. p. 87 (1811). 
111. Myoscalops, Thos. 
P. Z.S. 1890, p. 448. [Heliophobius, Pet. 
MB. Ak. Berl. 1846, p. 243.) 
112. Heterocephalus, Riipp. 
Mus. Senckenb. iti. p. 99 (1842). 
XI. Dipodide. 
A. SMINTHIN 2. 
113. Sminthus, Keys. & Blas. 
Wirb. Europ. p. 38 (1840). 
B. Zapopinz}. 
114. Zapus, Cones. 
Bull. U.S. Geol. Surv. ser. 2, no. 5, p. 253 
(1873). 
C. Dreopinz. 
115. Dipus, Gmel. 
S. N. i. p. 157 (1788). 
116. Allactaga, ¥. Cuv. 
P. ZS. 1836, p. 141. 
117. Platycercomys, Brandt. 
Bull. Ac. Pétersb. 1844, p. 209. 
118. Huchoreutes, W. Scl. 
P. Z. S. 1890, p. 610. 
1 The erection of the Zapodine into a family has been advocated by 
Dr, Coues (Mon. Am. Rod. p. 461, 1877), and, as a consequence, the giving to 
the Dipodine and Pedetine similar rank. Not only does this seem as unnecessary 
as it is inconvenient, but the characters of Sminthus,recognized as a Dipodid only 
since Dr. Coues wrote, appear to make the. correctness of Alston’s view more 
evident than ever. For with typical Dipodine teeth, it possesses an absolutely 
Zapodine skull, combined with a more Murine form than even Zapus. More- 
over, the recent discovery of Zapus inthe Old World (Poussargues, Bull. Mus. 
@Hist. Nat. 1896, p. 1) removes the geographical isolation which may have 
influenced Dr. Coues in the conclusion he came to. The three subfamilies here 
recognized are no doubt well defined from each other, but if in any general 
raising of rank all round, such as many people (Americans especially) are fond 
of, these subfamilies are again made into families,it will have to be on some better 
ground than the untenable view adopted by Dr. Coues, that Zapus is as nearly 
allied to the Muride as it is to the Jerboas. Pedetes, on the other hand, as 
appears below, should certainly be removed from the family, its differences 
from all the Dipodidx being infinitely greater than any of theirs from each 
other. 
Proc. Zoou. Soc.—1896, No. LXVI. 66 
