1892-] Zoology. 261 



extending over the back. Pectoral and ventral fins plain, spinous 

 dorsal bordered with black, also an imperfect stripe close to hack ; 

 soft dorsal with two imperfect dark stripes; caudal frequently barred. 

 Mouth horizontal, lower jaw included, maxillary reaching a Uttlfl hark 

 of front of orbit, nearly to edge of pupil. Lateral line incomplete, 

 reaching to about midway of the soft dorsal. 



Measurements taken as in specimens described above. 



Length. Head. Depth. Lat. line Dorsal Anal 



(total) scales. rays. rays. 



33 10 7 64 XII- 9 I-* 



33 10 8 64 XII-11 I-n 



—A. J. Woolman, South Bend, Indiana. March, 1892. 



Description of a New Mouse from Southern California. 

 — Seventeen specimens of a long-tailed Vesperimus collected at Dul- 

 zura, San Diego Co., Cal., belong to a species very different from any 

 hitherto described. In size and general characters they agree closely 

 with V. eremicus, but the color is curiously like that of V. californicus. 

 The species may be known by the following characters: 



Vesperimus fraterculus sp. nov. Size medium, tail decidedly longer 

 than head and body, thinly-haired and without pencil ; soles naked ; 

 ears rather large and very thinly-haired except at base and ttlong ante- 

 Adult male and female ( 9 No. VW collection of G. S. Miller. Jr., 

 Dulzura, San Diego Co., Cal., January 7, 1892. Charles ft Mar-h. 

 collection S No. HH same locality and collector, January 15, 1892) ; 

 fur everywhere, except in region of mouth, slaty plumbeous at base ; 

 ventral surface dirty yellowish-white, becoming purer on throat i 

 chin ; a distinct fulvous pectoral spot ; 

 stripe extending from region of eye: 



stripes of the two sides meet ; this fulvous area almost entirely with- 

 out black-tipped hairs and sharply defined against the color of the 



