RODENTIA—MURINAE—SIGMODON BERLANDIERI. 505 
the fourth. The central three toes are equal and longest, the first and fifth extend to the same 
distance (just beyond the base of the longer toes) and rise nearly opposite each other. The first 
claw is, however, the larger ; the palms are broad and naked from the heel. 
The upper parts, generally, are of a gray yellow brown, lined with dark brown, a little clearer 
along the sides. The under parts, with the top of the hind foot, are dull grayish white. The 
hairs everywhere are plumbeous at base, this color above becoming darker near the yellowish 
brown ends, which are tipped with black. Everywhere interspersed on the back are many 
longer hairs entirely black. 
Measurements. 
| 566 O 
ee 
Z Inches. Lines 
SOS LOC CRY SE ieee cs te rte es se 1 8 
OiG@ scoseccoctct coast eens asson tore een censreoss| oSeeotodse! 83 
GE Pec Oe sine eo enseoeaicbe dane ps cCOE SEE Sens 1 6 
POO Ur OL Galle 5 etalon aera ets aie lle as alata a 5 8 
end of outstretched hind legs....-...-.----------- eaters 
Tail, from root to. end of vertebre.-.--..----=----4----.-. 4 uf 
ars) heipht POstenlOrly==aqne— naa en ae ee ae eee ane ee 64 
intemally above: N0teh ~~ = <2 so<cems 22 cesessee|—<-2-oee a 74 
Arm, between claws across shoulder....------------------ 4 2 
fOKE TOO tOleNd Obs CLAW es wea se ee ee aie el 7 
lone estir ela wre ea we ar ta a tte lear eels 
Leg, from knee joint to end of claws---.....-.....-------.-=- 2 1} 
UL a ee nee: MNS ea Cent Se ee nie epee Meine eae 8 
hind foot from heel to end of claws_--..-.------------ 1 23 
Nonipesticl ewes ten ete ae ae er a aes ere aan 2 
lOnP eRigtoe ale Claws teen anne aeints aoe io ie [neo 4} 
This species is readily distinguishable from S. hispidus by the much lighter color above, 
where it is grayish yellow brown, instead of distinct reddish brown; the tail is considerably 
longer and covered by finer annuli. The toes are shorter and the metatarsus shorter, while 
the feet are nearly the same length. The claws, however, are much weaker. The tail is com- 
posed of twenty-one vertebra. 
This species bears some resemblance to the Arvicola texiana of Audubon and Bachman, and 
may possibly be the same. According to these authors, however, this last mentioned species is 
of a very different genus ; the tail is very little shorter than the head and body (4 inches to 
4,",,) the hind feet 1.25 inch ; the back brownish yellow, spotted with irregular small blotches 
of black, a faint, obscure stripe of black on each side ; sides reddish brown, belly whitish gray. 
All these features, if properly belonging to the species, render it very different from S. ber es ne. 
although it is quite possibly a Sigmodon. LK A Jan 
64 L 
