262 RHITHRODONTOMYS. 
Measurements. Average total length, 136.5; tail vertebra, 72; 
hind foot, 17; ear, r1.2. Skull: occipito-nasal length, 19.5; Hensel, 
14; zygomatic width, 8.5; interorbital constriction, 3; length of 
nasals, 7; palatal length, 7.3; length of upper tooth row, 3. 
a.—pallidus (Retthrodontomys!), Rhoads, Amer. Nat., 1893, p. 835. 
pallidus (Rhithrodontomys), Elliot, Syn. N. Am. Mamm., rgor, 
p. 152. Id. Suppl. p. 494. 
LOWER CALIFORNIA HARVEST MOUSE. 
Type locality. Santa Isabel, San Jacinto Mountains, San Diego 
County, California. 
Geogr. Distr. Southern California and northern Lower Cali- 
fornia, Mexico. 
Genl. Char. Larger than Fk. longicaudus and paler. 
Color. Above buffy gray, darker on dorsal line; face and lateral 
line ochraceous; under parts and feet white; spot between fore legs 
and on breast buff; tail bicolor. 
Measurements. Total length, 137; tail vertebre, 73; hind foot, 
16. Skull: occipito-nasal length, 19.5; Hensel, 14; zygomatic width, 
10; interorbital constriction, 3; breadth of braincase, 9.3; length of 
nasals, 7; palatal length, 7. 
252. saturatus (Keithrodontomys!), Allen & Chapman, Bull. Amer. 
Mus. Nat. Hist., 1897, p. 201. 
Las Vicas Harvest Mouse. 
Type locality. Las Vigas, State of Vera Cruz, Mexico. 
Geogr. Distr. State of Vera Cruz, Mexico; range unknown. 
Genl. Char. Similar to R. megalotis, but larger and darker. 
Color. Upper parts dark brown, lined with black on median 
line and tinged with grayish fulvous; sides grayish fulvous; under 
parts whitish plumbeous; tail dark brown above, gray below; hands 
and feet grayish white. 
Measurements. Total length, 148; tail vertebre, 74; hind foot, 
18. Skull: total length, 21; basal length, 17; zygomatic width, 11; 
width of braincase, 10; interorbital constriction, 2.5; length of 
nasals, 8; palatal length, 8; length of upper tooth row, 3.3. 
a.—cinereus (Retthrodontomys!), Merr., Proc. Wash. Acad. Scien., 
TOOL, P. 550. 
CINEREOUS Harvest Mouse. 
Type locality. Chalchicomula, State of Puebla, Mexico. 
Genl. Char. ‘Similar to R. saturatus, but very much paler and 
grayer, particularly the head and shoulders; tail shorter and more 
sharply bicolor; skull similar, but slightly smaller; rostrum 
’ 
shorter.’ 
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