PEROGNATHUS. 



A. Perognathus. 

 Mastoid well developed, extending beyond occipital line; inter- 

 parietal pentagonal; mastoid side of parietal longest; audital bullae 

 nearly contiguous below basisphenoid. 



Fig. 56. Perognathus flavus. 



No. 592 Field Columbian Museum Coll. Enlarged j4. 



Upper tooth row. 

 Enlarged 10 times. 



Lower tooth row. 

 Enlarged 10 times. 



367. fasciatus. (Ft-rcgnaf/u/s), Wied., Nov. Act. Akad. Cses. Leop. 

 Carol., 1839, p. 369, pi. 34. 



Type locality. Near junction of Yellowstone and Missouri Rivers, 

 Montana. 



Geogr. Distr. Eastern Montana and Wyoming and western 

 North and South Dakota. 



Genl. Char. Small; tail nearly as long as head and body; ears 

 small, no antitragal lobe; posterior half of soles haired. 



Color. Above blending of olive green and olive gray tinged with 

 pale fulvous and lined with black; lateral stripe pale fulvous; feet 

 and under parts white; two light yellow patches on ears, and one 

 larger behind ears. Tail, slightl)' paler beneath than above and 

 buffy on sides. 



Measurements. Total length, 135; tail vertebrae, 60; hind foot, 

 17.5; ear, 4.5. 



a. — Lnfraluteus. {Perognathus), Thomas, Ann. & Mag. Nat. Hist., 

 1893, p. 405. 



Type locality. Loveland, Larimer County, Colorado. 



Geogr. Distr. Colorado; limits of range not known. Type 

 locality only. 



Genl. Char. Size smaller than F. fasciatus : pelage soft. Soles 

 hairy on posterior half. 



Color. Above grayish olivaceous; sides, limbs and under parts 



