246 PEROGNATHUS. 



^feasurements. Total length, 138; tail vertebras, 80; hind foot, 

 19. Skull: greatest length, 21; greatest breadth, 12. 



b.—arenicoln. {Pt-ri'gnathits), Stephens, Proc. Biol. See. Wash., 

 1900, p. 153. 



Type locality. San Felipe Narrows, San Diego County, Cali- 

 fornia. 



Genl. Char. Similar to P. panainintiiius bangsi, but paler and 

 whiter; mastoids greatly swollen and projecting much farther back 

 than the occiput; interparietal very small. 



Measurements. Total length, 141; tail vertebrae, 82;hindfoot, 19. 

 (Stephens, 1. c.) 



c. — brevinasus. {Fi-rcgnat/uis). Osgood, N. Am. Faun., No. 18, 1900, 

 p. 30. 



Type locality. San Bernardino, California. 



Geogr. Distr. Southwestern California. 



Genl. Char. Similar to P. panamintinus, but darker. Skull 

 smaller; interparietal smaller, nasals shorter; lower premolar larger 

 than last molar. 



Color. Above pinkish buff lined with black; lateral line pinkish 

 buff; ears dusky, orbital ring buffy. Tail, buffy white, faintly dusky 

 above. 



Measurements. Total length, 124; tail vertebra, 66; hind 

 foot, 17.4. (Osgood, 1. c. ) 



374. nevadensis. {Perognathus), Merr. , Proc. Acad. Nat. Scien. Phil., 



1S94, p. 264, fig. 3. 



Type locality. Halleck, East Humboldt Valley, Nevada. 



Geogr. Distr. Central Nevada to southern Oregon and northern 

 Utah. 



Genl. Char. Small; similar to P. panamintinus, color of sides 

 and belly alike. 



Color. Above buffy gray mixed with black; lateral stripe buffy 

 ochraceous spreading over belly. Tail, dark above, buffy ochraceous 

 below. Throat and pectoral region white. 



Measurements. Total length, 127; tail vertebrs, 72.4; hind 

 foot, 18.7. 



375. pacificus. (Perognathus), Mearns, Bull. Amer. Mus. Nat. Hist. 



N. v., 1S98, p. 299. 



Type locality. Mouth of Tijuana River, Mexican boundary, San 

 Diego, California. 



Geogr. Distr. Edge of Pacific Ocean, on a flat at mouth of 

 Tijuana River. 



Genl. Char. Similar to P. brevinasus, but smaller, tail more 



