RODENTIA—ARVICOLINAE—ARVICOLA CINNAMONEA. 541 
anterior pair of re-entrant angles in the anterior lower molar come so close together as to cut off 
the isthmus of dentine ; the result of this is to divide the anterior indented lobe into two spaces, 
an anterior sub-quadrangular and a posterior sub-triangular, and extending across the tooth. 
This can scarcely be considered an exception to the characteristics given above, however. 
This, the most common arvicola about West Northfield, varies a good deal in its characters, 
being sometimes almost black above; sometimes the dull faded cinnamon of the belly is 
brighter, sometimes paler ; occasionally almost absent, leaving the basal plumbeous color most 
distinct. 
The description I have given of the species differs somewhat from that of Major Leconte ; but 
his original (belonging to the collection of the Smithsonian Institution) is one of the few in 
which the cinnamon tips of the hairs are inappreciable. There can be no question of their 
being the same. 
List of specimens, 
a s Measurements. 
g|s : 
4 = 
5 ES 3 Locality. Whence and how ob- 3 3 re a ' 5 3 é z = = 
2 |ea| 2 tained. & Slse) 8 | S| sel Saber les | 2.13 
Ble | 2 2 S/28}2 | |\chlezle8lee{ 2] F 
Bene. ch Sol 2 WaSelnsor SubeeyalS ole ahles 
6 |S | a zZ ES oleic | PS YEE sea Se Nee 
266 | 1999 |... .| Racine, Wis...... sccoe| Dr. P. Re HOY ..0- coe Skin ...... aeabeiilmainosh lexneeb| daaset|losdacidltdsece\|cceens\| ee coct 1.12 62 
ORB | 220s Ci e\enestsdO' cscs tet etree We tite Barry...eseeeeees| Inalcohol..| .49| .91 | 1.19 | 3.75 | 1.25 | 1.44} .38 |....ce[occee «|secces 
2897 |...00- secces|eocce dO cccce Scecccceee Dr. P. R. Hoy 2.22. 0000|22+dO covese 45 | ccccca|evacce|sneecs 1.17 | 1.42] .37 Na laeonsadled sees 
2923 |..000- G | West Northfield, Iil....| R. Kennicott ......+... «2 edO secces -41} .88] 1.10} 3.75] 1.11 ]1.31] .38 Taeaeune es 
QG2QS |oreve Ze eocceeEO ecccccccce ecceslecccce dO. scccecce cones 200 ccvece 42 88 171.05 | 3.25 | 1.04 | 1.14 37 92! | ccccce| acces 
Q9BL eevee] Qo [eweeee do wee. Secveceees iced eceese deececces|se GO veces 50 99 | 1.26 | 4.18 | 1.27] 1.53] .40 BL | ceccceleccace 
2IB2 |eeevee| Qo leveeee GO ceccvesccccvcesleccecs GO ccc cscccscacs © 0GO coccce 48 98 | 1.30 | 4.00 | 1.28 | 1.61] .38 OL) wewaieul onaaes 
2933 |...) g 00cedO ceevcevccccscesfeccnes dO cecccecees Bie ss| tec) vessel © .a0 93 | 1.19 | 3.40 | 1.21 | 1.48] .40 1S Welw dal ovcace 
QYTB Josevee| OC [reece OO 1. cavssecceecscelesaces GO .s000 . 200 ceccve 50 98 | 1.26 | 3.70 | 2.17) 1.40] .35| 70 |..cccelsceee . 
ZBOS |ancccs|sccces St. Louis........ Dr. Engelmann,........ ag O) auene 47 | .85] 1.10 | 3.35 | 1.00 | 1.13 32 720! neges al tatters 
BAD | GAT |e ce ssf occccedO ccced:ccccccces|sccses dO weccecicccveces DKitiisevce|csesh-|ecccss| scones 4.00 | 1.20} 1.40 | .30 80 | 1.06 61 
453 | 1587 |......| Calcasieu, La..........| G. Wurdemann..... .6/44.dO ceceeel|eeceesleee ceclecseeclere secleccsccleccessleececeleccecs } 1.10 |. oe 
ARVICOLA (PEDOMYS) CINNAMONEA, Baird. 
Spe. Cu.—Size of 4. austerus, 4.50 inches. Skull 1.12. Head narrow. Fur coarse, .4 of aninch above. Ears small; well 
furred ; half as long as the hind feet. Feet rather large ; hinder ones hairy beneath for half their length. Tail vertebra one- 
third the head and body ; not twice as long as hind feet. 
Above and on the sides, yellowish brown, mixed finely with black, but not obscured by it ; less black on the sides. A wash of 
dark rufous along the back. Belly pale cinnamon. | No distinct line of demarcation between the colors. Fur above darker 
plumbeous, just before the brown tips. ‘Fail strongly bicolor, colored like the corresponding regions of the body ; darkest at 
the tip. 
Skull very narrow. Length to width as 100 to 50. Muzzle very long. Line of molars scarcely one-fifth as long as the head. 
This species is of rather large size, and stout in proportion. The fur is rather coarse and 
stiff, especially the longer bristly hairs ; it measures about four-tenths of an inch above. The 
ears are small, longer than broad (.4 inch) ; rather thickly: covered with long hairs on both 
sides so as to hide the margin; the antitragus is of considerable development. The feet are 
large and stout; the thumb of the fore foot rudimentary or obsolete, enveloped or encircled in 
