BAILEY — NEW BEAVER FROM NORTH DAKOTA 
31 
groups generically. Attention has recently been called to the generic 
distinctness of these groups by Pocock^ he adopting for the banded 
mongooses Gray’s unavailable name Ariela. He also calls attention 
to the fact that the inclusion of the two groups under Crossarchus 
was due to erroneous information concerning the structure of the anal 
glands. Before meeting with Pocock’s paper I had become strongly 
impressed with their incongruity and their evident generic distinctness. 
Herpestes Illiger (1811), genotype,® Viverra ichneumon Linne, after 
almost universal employ for three fourths of a century, was hastily 
and, as it now appears, needlessly displaced in 1907® by Mungos 
Geoffroy and Cuvier and immediately the latter became current for 
the greater part of the mongooses of both Africa and Asia. It should 
now be returned to its time-honored place in nomenclature, through 
the allocation of Mungos to its proper station. 
As already shown, not only is Mungos untenable as a genus name 
for any Indian mongoose, but also the species name mungo is equally 
a misnomer when applied in the same connection, it belonging unques- 
tionably to the banded mongoose group of Africa. 
A NEW SUBSPECIES OF BEAVER FROM NORTH DAKOTA 
By Vernon Bailey 
In attempting to identify the beavers of North Dakota, for inclusion 
in my report on the mammals of the State, I find it necessary to apply 
a new subspecific name to those occupying the Missouri River drain- 
age. Strange to say the specimens show closer affinity with those of 
the Rio Grande drainage, than with those in the same State in the 
streams flowing into Hudson Bay. Under permit from the State Game 
Commission, I was allowed to collect two specimens in Apple Creek, 
about 7 miles east of Bismarck, and there are a number of additional 
skulls from along the Missouri and Little Missouri Rivers. While it is 
very desirable to obtain more material, and especially skins taken at 
^ On the severance of Ariela Gray (= Mungos s.s.) from Crossarchus see 
Pocock, Proc. Zool. Soc. London, 1916, p, 350 and text figures on pp. 353, 356, 
360, 369. 
® By subsequent designation, Anderson, Yunnan Exped., 1878, p. 171; Thomas. 
Proc. Zool. Soc., 1882, p. 63. 
® Cf. Thomas, Ann. Mag. Nat. Hist. (7), XX, p. 119, footnote. 
