﻿July, ]89C.] 



SUBGENUS LAGURUS. 



49 



tlie deeper. There is a salient angle at tlie outer base of the posterior 

 loop and the outer border is faintly crenulate. A tooth with nine well- 

 developed salient angles is the result. 



Other teeth. — The front maxillary teeth are exactly as in tetramerodont 

 Microtus. The hack molars of the lower jaw are likewise in no way 

 peculiar. They both, however, have the x^risms on the two sides oppo- 

 site, thus lacking all closed triangles. 



There is nothing worthy of note in the form of the incisors. 



Mamnue. — In tlie unique type specimen of Microtus clihiensis, which is 

 a female, there are four teats, all inguinal. 



Feet. — The sole is well haired from heel to tubercles. There are six 

 pads on the sole, all well developed. 



Fur. — The fur is not specially modified. 



General remarlis. — In its palate structure Anteliomys is related to 

 Fothenomys, and more remotely to A lticola, together with which it 

 bridges the gap (so far as the j^alate alone is concerned) between Micro- 

 tus and Fvotomys. These facts were in part noticed by Mr. Thomas, 

 who says in the original account of M. cMnensis : 



In some respects it seems to be annecteut between Evotomys and tlie rest of the 

 Toles, the structure of its x^alate and some of its dental characters [opposite prisms 

 and rounded angles] showing striking aflinitiesto the former, far as its rootless teeth, 

 fewer mamm;e, and different external form separate it from any of the hnown mem- 

 bers of that group. 



The enamel pattern is, however, very different from that of Evotomys^ 

 while the resemblance to that of its nearest relative, FotlienomySj is 

 almost equally remote. 



Microtus chinensis is the only species of Anteliomys thus far known, 

 unless jl/icrotiis middendorffii {Vo\y^]^oEY ivom Siberia ^ proves to be 

 a member of the same group. The figure of the teeth in the original 

 description of M. middendorffii is suggestive of Microtus cliinensiSj 

 though the triangles are very strongly isolated. Neither the palate 

 structure nor the number of mammii? is given by Polyakoff, so it is 

 im])ossible to come to any conclusion on the subject of the animal's 

 true status. 



Subgenus LAGURUS Gloger. 



1841. Lagurus Gloger, Genieinn. Haud-u. Hilfsbuc]i d. Naturgesch., p. 97, 1841 



(genus). Type, Lagurus m'lgraiorius G\ogcv= ILus lagurus Pallas? ^ 

 1895. Lagurus Merriam, Am. Naturalist, XXIX, p. 758, Aug., 1895 (subgenus). 



iMem. Acad. Imp. Sci., St, Petersbourg, XXXIX suppL, p, 70, 1881. 

 - Polyakoff gives the following localities : Taimur, Vilui River, Ayan, and Kara 

 River. 



^In restoring the generic name Lagurus (Ann. & Mag. Nat. Hist., 6th ser., XV, 

 Feb. 1, 1895) Mr. Thomas gives the species lagurus as the type. It aj)pears highly 

 probal)le, however, that Gloger's Lagurus migraiorius is the Hypudanis migratorius 

 of Lichtenstein (Eversmann's Reise nach Buchara, p. 123, 1823) — Microtus (Lagurus) 

 luteus (Eversmann). 



16933—^0. 12 1 



