Genl. Char. Size large, dark; tail rather long. Anterior root of 

 zygoma sloping back at a considerable angle. Skull long and large, 

 angular; rostrum long and narrow. 



Color. Above chestnut, beneath paler; sometimes whitish; feet 

 white; tail brown basally, white apically. 



Measurements. Average total length, 270; tail vertebrae, 80; hind 

 foot, 35. 



323. lutescens. {Gcomxs), Merr., Mon. Geom., N. Am. Faun., No. 8, 



1895, p. 127. 



Type locality. Sand hills of Birdwood Creek, Lincoln County, 

 western Nebraska. 



Geogr. Distr. Great Plains and southwestern South Dakota, 

 southward to Colorado, Texas, western Nebraska, western Kansas, 

 eastern Colorado, western Oklahoma and western Texas. 



Genl. Char. Size medium, colors pale, tail moderate. Skull 

 short, sagittal crest low; anterior root of zygoma sloping backward; 

 brain case and rostrum short. 



Color. Above in winter drab mixed with black on median line, 

 this in summer being dull fulvous without dorsal band; beneath buffy 

 or sometimes white. 



Measurements. Average total length, 256; tail vertebrae, 77; hind 

 foot, 32. 



324. breviceps. {Geomxs), Baird, Proc. Acad. Nat. Scien. Phil., 1855, 



P- 335- 



Type locality. Prairie Mer Rouge, Morehouse Parish, Louisiana. 



Geogr. Distr. Mississippi Valley and Gulf Coast, in southern 

 Arkansas, Louisiana and Texas, and valley of the Arkansas River; 

 north nearly to southern Kansas and west to near 98th meridian. 



Genl. Char. Size small, color dark; tail medium. Skull: nasals 

 emarginate posteriorly; ascending branches of premaxillse broad and 

 rounded posteriorly; interparietal small, irregular; jugal longer than 

 basioccipital; pterygoids narrow. 



Color. Above dark russet brown, darkest on median line; nose 

 and front of face dusky tinged with russet; sides pale fulvous; beneath 

 plumbeous washed with pale fulvous; feet and throat white; base of 

 tail dusky. 



Measurements. Average total length, 219; tail vertebra?, 64; hind 

 foot, 27. 



a.—sa^ittalis. (Geomys), Merr., Mon. Geom., N. Am. Faun., No. 8, 

 1895, p. 134. 

 Type locality. Clear Creek, Galveston Bay, Texas. 

 Geogr. Distr. Gulf Coast of Te.xas around Galveston Bay. 



