72 Osyood Thirty New Mice of the Genus Peromyscus. 



Peromyscus lophurus sp. nov. 



Type from Todos Santos, Guatemala. Adult male, No. 77,219, U. S. 

 National Museum, Biological Survey Collection, December 30, 1895, E. W. 

 Nelson and E. A. Goldman. 



Characters. Most similar to P. Upturns, but smaller and paler ; tail long 

 and covered with comparatively long soft hairs, and terminating in a 

 distinct pencil ; pelage soft and ' woolly ' and rather dull and lusterless ; 

 skull with large interparietal and short nasals. 



Color. Type: General effect of upper parts between wood brown and 

 fawn color, with a small dusky area in middle of back ; lateral line pale 

 ochraceous buff; under parts white; no pectoral spot; tail sepia brown, 

 unicolor; forearm dusky to wrist, fore feet white; hind feet dusky 

 brownish to base of toes ; toes white ; orbital ring dusky black, rather 

 narrow, but expanded into a distinct spot in front of eye. 



Skull. Similar to that of lepturus, but smaller and with rostral part 

 decidedly shorter ; molar teeth actually about same size, relatively larger ; 

 interparietal very large. Compared to that of P. levipes, the skull of 

 lophurus is shorter, with shorter nasals and heavier infraorbital region; 

 the teeth are decidedly heavier and longer and the interparietal larger. 



Measurements. Average of 4 adult topotypes: Total length, 208; tail 

 vertebrae, 105; hind foot, 24.5; ear from notch, 16. Skull of type: 

 Greatest length, 27.5; basilar length of Hensel, 20.8; zygomatic width, 

 14.7; interorbital constriction, 4.3; interparietal, 10 x 4.5 ; nasals, 10; 

 bony palate, 4; palatine slits, 5.4 x 2; diastema, 6.5 ; postpalatal length, 

 9.6; upper molar series, 4.7. 



Remarks. This very distinct species may be easily recognized by its 

 crested tail and usually by the absence of white on the under side of the 

 tail. All the specimens from Todos Santos have unicolor tails, but 2 from 

 Calel are quite distinctly bicolor, and among 4 from San Cristobal, 2 have 

 unicolor and 2 imperfectly bicolor tails, indicating that this character is 

 not invariable. The character of the pelage differs somewhat from most 

 of the smaller species of Peromyscus in being dull and soft without the 

 usual gloss, and although rather short it is fine and slightly ' woolly.' 



Specimens examined. Total number, 15, from localities as follows: 

 Pinabete, Chiapas, Mexico, 5; San Cristobal, Chiapas, Mexico, 4; Calel, 

 Guatemala, 2 ; Todos Santos, Guatemala, 6. 



Peromyscus simulatus sp. nov. 



Type from Jico, Vera Cruz, Mexico (altitude 6000 feet). No. 55,028, 

 U. S. National Museum, Biological Survey Collection, July 12, 1893, 

 E. W. Nelson. 



Characters. A miniature of P. Idphurus (hind foot 21); dark markings 

 lightly more intense ; skull and teeth very small ; tail clothed with long, 

 soft hairs and crested as in lophurus; audital bullse relatively large. 



