54 PEROMYSCUS. 



Peromyscus leucopus mesomelas Osgood, N. Am. Fauna, No. 28, 



1909, p. 132. 

 Type locality. Orizaba, State of Vera Cruz, Mexico. 



Peromyscus pectoralis laceianus Bailey. 



Peromyscus pectoralis laceianus Bailey, Proc. Biol. Soc. Wash., 

 XIX, 1906, p. 57. 



Type locality. Lacey Ranch, near Kerrville, Kerr County, Texas. 



Geogr. Distr. West Central Texas, from the vicinity of Austin 

 to the Big Bend of the Rio Grande and immediately adjacent parts 

 of Mexico. 



Genl. Char. Similar to P. pectoralis; tail shorter, no pectoral spot. 



Color. Upperparts dark buffy gray; cheeks and shoulders bright 

 buff; underparts white; tail above dark brown, beneath white; feet 

 white. Ex type in United States National Museum. 



Measurements. Total length, 185; tail, 95; hind foot, 23. Skull: 

 Occipi to-nasal length, 26.8; Hensel, 19.5; zygomatic width, 13.5; 

 intertemporal width, 4.4; length of nasals, 10; length of upper molar 

 series, 4; length of mandible, 12.2; length of lower molar series, 4.5. 

 Ex type in United States National Museum. 



Peromyscus truei lagunae Osgood. 



Peromyscus truei lagunce Osgood, N. Am. Fauna, No. 28, 1909, 

 p. 172. 



Type locality. La Laguna, Laguna Mountains, Lower California, 

 Mexico. 



Geogr. Distr. Mountains of the region of the extremity of the 

 peninsula of Lower California, Mexico. 



Genl. Char. Like P. truei, tail longer, ears smaller. 



Color. Upperparts ochraceous-buff lined with dusky; nose and 

 region behind orbits grayish; orbital ring dusky; underparts creamy 

 white; tail above brownish dusky, beneath white; hands and feet 

 white; ankles dusky. Ex type in United States National Museum. 



Measurements. Total length, 215; tail, 109.6; hind foot, 18.6 

 (skin). .Skull: Occipito-nasal length, 27.1; Hensel, 20.9; zygomatic 

 width, 12.4; intertemporal width, 4.1; length of nasals, 10.7; length 

 of upper molar series, 4.6; length of mandible, 12.1; length of lower 

 molar series, 5. Ex type in United States National Museum. 



Peromyscus megalops melanurus Osgood. 



Peromyscus megalops melanurus Osgood, N. Am. Fauna, No. 28, 

 1909, p. 215. 



Type locality. Pluma, Oaxaca, Mexico. 



Genl. Char. Similar to P. melanops, but smaller; skull and teeth 

 generally smaller; pelage variable in color. 



