96 PEROGNATHUS. 



Perognathus longimembris neglectus Taylor. 



Perognathus longimembris neglectus Taylor, Univ. Calif. Publ. Zool., 



X, 1912, p. 155. 

 Type locality. McKittrick, Kern County, California. 



Perognathus xanthonotus Grinnell. 



Perognathus xanthonotus Grinnell, Proc. Biol. Soc. Wash., XXV, 

 1912, p. 128. 



Type locality. Freeman Canon, east slope of Walker Pass, Kern 

 County, California. Altitude 4000 feet. 



Subgenus Choetodipus. 



Perognathus baileyi insularis Townsend. 



Perognathus baileyi insularis Towns., Bull. Am. Mus. Nat. Hist., 

 XXXI, 1912, p. 122. 



Type locality. Tiburon Island, Gulf of California, Mexico. 



Genl. Char. Similar to P. penicillatus pricei but not so red, and the 

 tail much longer. Skull larger, broader and longer. 



Color. Entire upperparts vinaceous-buff lined with black; no 

 lateral stripe; underparts and inner side of limbs white; outerside 

 like upperparts; hands and feet white; tail above, basal half grayish 

 brown, remainder with tuft darker brown, beneath white. Ex type 

 in United States National Museum. 



Measurements. Total length, 212; tail, 118; hind foot, 27. 

 Skull: Occipito-nasal length, 28.1; Hensel, 19.3; zygomatic width, 

 1 2.1; intertemporal length, 6.4; length of nasals, 12.2; length of 

 upper molar series, 3.9; length of mandible, 14.4; length of lower 

 molar series, 3.2. Ex type in United States National Museum. 



Perognathus penicillatus ammophilus Osgood. 



Perognathus penicillatus ammophilus Osgood, Proc. Biol. Soc. 

 Wash., XX, 1907, p. 20. 



Type locality. Margarita Island, Lower California, Mexico. 



Genl. Char. Size about as that of P. p. siccus; color paler; mas- 

 toids smaller. 



Color. Like P. p. arenarius; upperparts ecru-drab; no lateral 

 line; underparts creamy. Ex type in United States National Museum. 



Measurements. Total length, 171-188; tail vertebrae, 100-113; 

 hind foot, 23.5-25.5. Skull: Greatest length, 26.1; basilar length, 1 8; 

 mastoid width, 13.2; zygomatic width, 13.1; interorbital constric- 

 tion, 6.6; nasals, 9.4; interparietal, 7.3 X 3.8; maxillary toothrow, 

 3.8. Ex type in United States National Museum. 



