20 



NORTH AMERICAN FAUNA 66 



tion also appear to be intergrading with S. c. cinei^eus. S. c. fontinalis 

 appears to represent the end of a cline with regard to small size, 

 shortening of the rostrum, crowding of the unicuspid toothrow, and 

 short tail. 



Maryland represents the southern terminus for the distribution of 

 the species Sorex cinereus east of the Appalachian Mountains. 



SOUTHEASTERN SHREW 



Sorex longirostris longirostris Bachman 



Sorex longirostris Bacliman, Journal Acad. Nat. Science, Philadel- 

 phia, ser. 1,7 (2) :3T0, 1837. 



Type looality. — Hume Plantations, swamps of the Santee River (= Cat Island, 

 mouth of Santee River) , South Carolina. 



General distri'bution. — The southeastern United States from southern Mary- 

 land and the District of Columbia to central Florida, and westward, around 

 the southern end of the Appalachian Mountains to Kentucky, central Indiana, 

 and Illinois. 



Distribution m Maryland. — ^The soutliem portion of the Western 

 Shore section, and perhaps extending into the lower Piedmont section. 

 Maryland is the northernmost limit of the distribution of the species 

 in the eastern United States. 



Distinguishing chxiTdcteristics, — This shrew may be easily confused 

 with Sorex cinereus ^ particularly the race f ontinalis, and with Miero- 

 sorex hoyi. It is distingnished from Swex cinereus by the following : 

 size smaller; tail shorter; coloration more reddish in winter pelage; 

 feet smaller; rostrum shorter and blunter; unicuspid toothrow more 

 crowded; and a greater tendenc}^ for the fourth unicuspid to exceed 

 the third in size. From Mioi^osorex Jimji it differs in a major dental 

 character. In Microsorex the third upper unicuspid is minute and 

 disk-like, and not visible when the jaw is seen in side view. The fifth 

 unicuspid is also minute and not visible in side view, so that only 3 

 unicuspids are visible laterally in the upper jaw, the first, second, and 

 fourth. In Sorex longirostris (and Sorex cinereus) 4 or 5 unicuspids 

 are always visible when the skull is viewed laterally. In addition, 

 Sorex longirostris is somewhat larger, more reddish in coloration, 

 and has a longer tail than Microsarex h oyi. 



Measurements. — One specimen fxom Chesapeake Beach, Calvert 

 County, has the following cranial measurements : Condylobasal length 

 14.3; cranial breadth 6.6; least interorbital breadth 2.9; maxillary 

 breadth 4.1; crown length of upper toothrow (exclusive of first in- 

 cisor) 5.1. 



Three specimens from Raleigh, N.C., average 82.6 mm. in total 

 length and have an average tail length of 30.2 mm. 



