Allen.] 194 [January 5, 



The two following species of Arvicola also doubtless exist, at least 

 in portions of the State, as they are not uncommon in the adjoining 

 State of Illinois. 



44. Arvicola austera LeConte. (Prairie Meadow Mouse.) 



45. Arvicola pinetorum LeConte. (Pine Mouse.) 



46. Fiber zibethicus Cuvier. (Muskrat.) 

 Common along the streams. 



LEPORIMJ. 



47. Lepus sylvaticus Bachman. (Gray Rabbit.) 



Common about the groves and thickets. In respect to the distribu- 

 tion of this species in Iowa, Dr. White has written me as follows: "It 

 occurs all over the State, but is not common in the northwestern part. 

 Indeed it is most common in the most cultivated districts, especially 

 in southern and southeastern Iowa." He adds that this is the only 

 species of rabbit occurring in the State, to his knowledge. 



It is probable that the Prairie Hare (L. campestris Bach.), the 

 western representative of the L. americanus of the northern tier of 

 States east of the Mississippi (if there is, in fact, any reason to con- 

 sider them distinct), may occur in the northern part of the State. 



DIDELPHID^E. 



48. Didelphys virginiana Shaw. (Opossum.) 



From its general known distribution, this species might well be 

 expected to be more or less frequent in the southern part of the State. 

 Dr. White, however, informs me that it is very rare there, but that 

 he saw two specimens some years since in the southeastern part. 



January 5, 1870. 



Mr. R. C. Greenleaf in the chair. Twenty one members 

 present. 



Drs. G. A. Maack and Francis R. Staehli and Messrs. James 

 H. Blake, Richard Bliss, Jr., and A. R. Crandall of the Mu- 

 seum of Comparative Zoology at Cambridge, Mr. Frederic 

 W. Wheildon of Concord, Mr. Frederic A. Clapp of Dor- 

 chester, Mr. Timothy O. Fuller of Newton, Mr. Charles J. 



