MURIDA—ARVICOLINA—ARVICOLA QUASIATER. 2. 
soles are very sparsely hairy—a central line of nakedness, at least, extending 
almost to the heel. The plantar callosities are not perfectly plain in the dried 
skin, but there appear to be only five: one on the inner side of the foot, mid- 
way between the heel and tip of the inner toe; one at the base of this toe; 
one at the base of the second toe; one at the bases of the third and fourth 
toes; and one at the base of the outer toe; none of them are prominent. 
The hairs on the dorsum of the feet are scanty, the longest barely reaching 
the tips of the nails. The fore feet, measured from the extreme palmar 
tubercle, are just half as long as the hinder and rather broader; the nails 
seem a trifle longer, and certainly are no shorter than those of the hind. 
The rudimentary thumb and its obtuse abortive nail are as usual in the genus. 
The ears are large for this section of the genus, and obviously overtop the 
fur a little; they are rounded; in the dried state, the anterior margin of the 
conch is reflected, but this may be an accident of preparation; the rest of 
the auricle is flat; the antitragus is but slightly developed, being little more 
than a stiff ridge, incapable of closing the meatus. The flat part of the 
conch is pretty closely furred both side and out—the hairs being short and 
pilous, rising but little beyond the margin of the ear. The tail is very slen- 
der as well as short, moderately hairy, and with a slight terminal pencil. 
The following measurements are believed to be a very close approxima- 
tion to the truth, owing to the skillful preparation of the specimens by their 
distinguished collectors :— 
Dimension. No. 3524. | No. 7006. 
IEEE) CB 99600 COCO EC BOSS e CASI SERIE OS EC SRBC ST EASELS SESE HO BOSE OA SEE OES 0.55 0. 45 
INEGI (1) GE 5 “BEE CBAs BE ROS Baas Robe g te ce Saeco SddichesHcceanscss 1.10 1.00 
Nose to root of tail..--....--- b peco boson onszcaenéuececsicae AC RESAeESEEHCOCEES 4.33 4.45 
WS arGrGl PA ge 0 hee p8ne so Reb O SOR Btn 55 BS8e OFS CECr EOS O ESOS OS =o OROO=E Es 0.70 0.70 
Teen OE OW WEE) sade See so BSncse HSSons SOEES SoBe EOC Cag 6 SoS OLOSeHEEpO Seer 0. 80 0. 80 
RG nA@? GEte TNIV ec sen cncA Hs ebesse popes neees Seb ECOSe oo HeteoTbaeres Seas 0. 45 0.45 
Height of ear behind..---..----..-------- SECU DSR OLOne Hees ceose an scocs nec nee 0. 20 0. 20 
TEMS OF Sa esse sa c686 Sor SOOO EE Aa COd OSE RU DEC D CCnE EEE eC eae Soa eos 0,33 0.3: 
Ment hvOl Ol Ole sacacreacine come emineam =-elencelcciee|s scene sensine/nesele-noas ooas/sn= 0. 66 0. 65 
ene iivol Lo rioniE Ne DRO Kista =etee elo e a ele em elen nae eee elena =~ ale eee oa 0, 33 0.33 
The type-specimen, No. 3524 (Mus. Smiths.), was taken at Xalapa, Mex- 
ico, by M. R. M. De Oca. No. 7006, taken at Tuxpango, Mexico, by Prof. F’. 
Sumichrast, does not differ in any appreciable degree. These are the only 
Mexican Arvicole we have seen. 
