MAMMALS OF MARYIANI> 



27 



PIGMY SHREW 



Microsorex hoyi winnemana Preble 



Microsorex winnemana Preble, Proc. Biol. Soc. Washington, 23 : 101, 

 24 June 1910. 



Type locality. — Bank of Potomac River near Stubblefield Falls, Fairfax 

 County, Va. 



General distribution. — Maryland, south into western North Carolina. 



Distribution in Maryland. — May occur in all sections, but is rare. 

 It has been taken in Maryland only at Berwyn, Prince Georges 

 County. 



Distinguishing chara/jteristics. — This is the smallest mammal in 

 North America and possibly the smallest in the world with respect to 

 weight. Externally it resembles 8 or ex cinereus and Sorex longirostris, 

 but is smaller and darker (less reddish) and has a shorter tail. Al- 

 though the tooth formula is the same as that of the genus Sorex, there 

 are certain peculiarities in the upper unicuspid toothrow which dis- 

 tinguish it. The third upper unicuspid is minute and disklike, com- 

 pressed anteroposteriorly between the second and fourth unicuspids, 

 and is not visible when the jaw is viewed laterally. The fifth unicuspid 

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

 three unicuspids can be seen in the side view of the upper jaw (first. 



Figure 8. — Distribution of Microsorex hoyi winnemana. 



