FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 143 



in such a manner as to expose the heart and lungs. The remark- 

 ably congested condition of these organs first attracted my atten- 

 tion; in fact, it would appear as if all the blood had collected within 

 the thorax. The pulsation of the heart was reduced to four each 

 minute; the auricles would slowly and imperfectly contract, followed 

 immediately by the ventricles. These slow pulsations of the heart 

 occupied four seconds, there was no visible respiration, the lungs re- 

 maining almost entirely passive. The heart continued to pulsate, 

 without perceptable change, for fifteen minutes, and then when raised 

 from its position it continued to pulsate for some time, being almost 

 reptilian in this aspect. During hibernation the circulation is so 

 feeble that when a limb is amputated but few drops of blood will slowly 

 ooze from the fresh wound. The stomachs and bowels empty, and 

 the body was enclosed in a thick adipose layer. I was not able to 



Map illustrating approximate distribution of Striped Prairie Squirrels in eastern United States. 

 Several other forms occur in the West. 



Citellus tridecemlineatus (MITCHILL). Type locality Central Minnesota. De- 

 scription as previously given. 



Citellus t. badius (BANGS). (Proc. New Engl. Zool. Club, I, 1899, p. I.) Type 

 locality Stotesbury, Vernon Co., Missouri. Similar to tridecemlineatus, 

 but larger and more red brown on the tail. 



