;56 



MERRIAM 



Measurements.— 'Yy^^& specimen (9 ad.): total length 196 mm.; 

 tail vertebra; loS; hind foot 21. Average of 2 specimens from type 

 locality: total length 193; tail vertebrae 106; hind foot 21.5. 



REITHRODONTOMYS SATURATUS CINEREUS subsp. nov. 



Type from Chalchicomula, Puebla, Mexico. No. 53633. $ ad. 



U. S. National Museum, Biological Survey Coll. April 13, 1893. 



E. W. Nelson and E. A. Goldman. Orig. no. 4659. 



Characters. — Similar to 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. 



Measurements. — Type specimen ( $ ad.) : total length 149 mm. ; 

 tail vertebrae 73 ; hind foot 19. 



REITHRODONTOMYS SATURATUS ALTICOLUS 

 subsp. nov. 



Type from Cerro San Felipe, near Oaxaca City, Oaxaca, Mexico (al- 

 titude 10,000 ft.). No. 6S392. $ old, U. S. National Museum, 

 Biological Survey Coll. Aug. 24, 1S94. E. W. Nelson and E. 

 A. Goldman. Orig. no. 6623. 

 Characters. — Similar to saturatus but tail somewhat shorter; 



rostrum shorter; bullae larger. 



Measurcmc7its. — Type specimen {$ old): total length 153 mm.; 

 tail vertebrae 75; hind foot 19. Average of 2 males from type lo- 

 cality; total length 152; tail vertebra; 78.5; hind foot 18.5. 



REITHRODONTOMYS DIFFICILIS sp. nov. 



Type from Orizaba, Vera Cruz, Mexico (altitude about 4,500 ft.). 



No. 63735. $ ad. U. S. National Museum, Biological Survey 



Coll. ' Feb. 20, 1S94. E. W. Nelson and E. A. Goldman. Orig. 



no. 5868. 



Characters. — Size a little larger than saturatus; color fulvous; 

 tail bicolor; ears medium or rather short; pelage coarse. 



Color. — Upperparts fulvous, grizzled with black tipped hairs; 

 underparts washed with pale fulvous except on chin and throat, which 

 are whitish; fore and hind feet whitish ; a dark spot on ankle; tail 

 dusky above, whitish below, with a rather sharp line of demarcation. 



Cranial characters. — Skull similar in general to that of satura- 

 tus^ but incisive foramina more broadly open; molar series slightly 

 shorter. 



Measuretnefits. — Type specimen ( ^ ad.): total length 177 mm.; 

 tail vertebrae 100; hind foot 19.5. 



