PEROMYSCUS. 175 
PAGE 
Gi ADOVe THIVOUS. DIOWM oo. ie P. 2. cristobalensis 209 
r.’ Rostrum elongated, bullz small. 
a.’ Above fulvous chestnut and black...... P. megalops 210 
b.” Smaller and darker. 
rclebeeida A Chon) 0) (oh 3) ae P. melanocarpus 210 
bb.  Paslowith white lime beneath... .. 4 +t P. altilaneus 210 
Gy A OVS DIS CKISICOTAY vei. leva aie P. guatemalensis 211 
Gee NDOME GOORY OOM ost st) xh raise oe P.cacabatus 211 
b. Tail nearly two-thirds the length of head and 
DDG ae WacRBMUEIME Sn aastness = onal vars, said sala s hee P. mectsturus 212 
127. tiburonensis (Peromyscus), Mearns, Proc. U. S. Nat. Mus., 
T3807, Pp. 7.20. 
IsLAND OF TIBURON MOUSE. 
Type locality. Tiburon Island, Gulf of California, Mexico. 
Geogr. Distr. Known only from type locality. 
Genl. Char. Size very small; ears nearly naked. 
Color. Upper parts drab gray and black; sides ochraceous cin- 
namon; under parts white; tail blackish brown; hands and feet 
white; ears dark brown. 
Measurements. Total length, 175; tail vertebrze, 85; hind foot, 
19; ear, 16. Skull: total length, 24; greatest width, 12. (Mearns, 
Ste) 
*127a. allex (Peromyscus), Osgood, Proc. Biol. Soc. Wash., xvi, 
L9O4, pw 70; 
Dwarr Mouse. 
Type locality. Colima, State of Colima, Mexico. 
Genl. Char. Like P. musculus, but smaller; nasals short; bulle 
very small. 
Color. Exactly like P. musculus. 
Measurements. Total length, 113; tail vertebre, 47; hind foot, 
14; ear from notch, 9.7. Skull: greatest length, 18.4; Hensel, 14.6; 
zygomatic width, 9.6; interorbital constriction, 3.2; length of nasals, 
6.3; interparietal, 5.5 x 1.3; palate, 3; length of upper molar series, 3. 
128. musculus (Sitomys), Merr., Proc. Biol. Soc. Wash., virr, 1892, 
1D, 170% 
Cotima City Mouse. 
Type locality. Near Colima City, State of Colima, Mexico. 
Geogr. Distr. States of Colima and Jalisco, Mexico. 
Genl. Char. Similar to P. taylori, but lighter and larger. 
*Descriptions of numerous forms of Peromyscus by Mr. Osgood (I. c.) were 
published too late to be included here in their regular numerical order. 
