Feb. 28 BANGS — NOTES ON DEER MICE 13 
1905 
Peromyscus leucopus fusus!’ subsp. nov. 
MarTHA’S VINEYARD DEER MOoOusE. 
Distribution. — Martha’s Vineyard Island, Massachusetts. Found in the 
oak woods, along the edges of the swamps, and occasionally in old buildings 
near woods, and in stone walls and brushy pastures. Not abundant anywhere 
that I have trapped. 
Type, from West Tisbury, Martha’s Vineyard Island, Massachusetts, adult 
&@, no. 9737, Bangs coll., coll. of Museum of Comparative Zodlogy, collected 
June 17, 1899, by O. Bangs. 
Characters.— Similar “in color and general appearance to Peromyscus 
leucopus noveboracensis, but much larger; skull larger and rather heavier, the 
rostral portion of the skull much longer (this character well marked and con- 
stant) ; teeth larger, though perhaps not more than proportionately so. 
Color.— Type, in summer: upper parts rich brown (a color somewhat 
between tawny and Prout’s brown) ; darker along middle of back where the 
dusky-tipped hairs form an irregular dorsal stripe; under parts white, the base 
of the hairs gray; feet and hands white; ears dusky ; tail bicolored, blackish 
above, white below. 
Other summer examples are much duller in color, being almost hair-brown. 
In color, and in variations in color with age, season, etc., this form agrees 
with P. leucopus noveboracensis, and cannot be distinguished from it. 
MEASUREMENTS (in millimeters). ~ 
No. Sex and age Total length Tail vertebra Hind foot 
9737 (type) g ad. 197-0 92.0 23-5 
9738 & ad. 190.0 85.0 22.0 
9740 2 axel. 187.0 88.0 22.0 
9739 Goade 199.0 96.0 Zs 
1253 Gnad: 199.0 89.5 2105 
1254 & ad. 192.5 87.0 23.0 
1252 Q ad. 203.0 95.0 22.0 
Skull, type, old adult @: basal length, 25.8; occipito-nasal length, 28.4; 
length of nasals, 10.6; length of palatal slits, 5.4; length of palate, to palatal 
notch, 11.4, to end of pterygoid, 16.2; upper molar series, 3.8; zygomatic 
width, 14.6; mastoid width, 12.; interorbital width, 4.4; length of single half 
of mandible, 15.8; lower molar series, 3.6 mm. 
1 Fusus — large. 
