30 



REVISIOX OF AMERICAN MOLES— TRUE. 



32 mm. is found. Thus, 9 skulls from central Alabama, northern Loui- 

 siana, and central Arkansas have an average total length of 33.0 mm. 

 It might be expected that this gradual increase would continue as we 

 proceed northward, but such seems not to be the case. On the con 

 trary, there appears to be a sudden increase about on the thirty-sixth 

 parallel, skulls from Tennessee and southeastern Kansas being scarcely 

 inferior in point of size to any in the collection. All over the Ohio and 

 northern Mississippi valleys the largest dimensions prevail, and no 

 correlation between size and geographical location can be traced. 



The highest average in size of skulls is found in Illinois, 6 skulls from 

 this State giving 37.3 mm. for average total length. Five skulls from 

 Missouri give 37 mm., and two from Kansas, 30.0 mm. The largest skull 

 in the five collections is one from Warsaw, Illinois (No. 30555 $ ), be- 

 longing to the National Museum. This has a total length of 39.8 mm. 



The size of a number of these large northern skulls is given in the 

 following table: 



Catalogue 

 number.* 



N. M. 

 Merr. 

 DA. 

 N.M. 

 N.M. 

 N.M. 

 N.M. 

 N.M. 

 D. A. 

 N. M. 

 N.M. 

 N.M. 

 D. .\. 

 1). A. 

 D. A. 



35266 



4264 



46496 



35211 



35201 



36555 



36515 



15398 



64225 



1642 



1638 



1639 



54097 



40407 



43761 



Sex. 



Locality. 



Madisonville, Oliio. . . 



Eiiljiink.s, Ky 



Hig Sandy, Tenu 



Warsaw, 111 



do 



...do 



Hamilton, 111 



BtslUivlllc, 111 



IM.smarck, Mo 



St. Louis, Mo 



do 



do 



Onaga, Kan 8 



So 



Council Bluffs, Iowa. 



Total 

 length. 



mm. 



38.0 

 36.0 

 38.6 

 37.6 

 36.5 

 39.8 

 39.0 

 36.0 



*In this table and throughout the paper the following abbreviations are used to denote the several 

 collections examined : 

 N. M. or U. S. N. M = U. S. National Museum. 

 D. A. ^^TJ. S. llepartment of Agriculture. 

 A. M[. = American ^luseum of Natural History, New York. 

 A.N. S. P- = Academy of Natural Sciences, Philadelphia. 

 Merr. = Merriam collection. 



This large mole is the machrinns of Rafinesque, who described a 

 specimen from near Lexington, Kentucky.' 



The later, but more familiar, name an/entatus of Audubon and Bach- 

 man is a synonym. The type described by these authors is said by them 

 to have been obtained on the prairies of Michigan.- It is probable, 

 however, that their si^ecimen really came from northern Ohio, which at 

 one time formed a part of the territory of Michigan. In another con- 

 nection the authors referred to ^ speak of Erie County, Ohio, as being 

 in Michigan. 



1 Atlantic .Journal, 1832, p. 61. 



sjonru. Acad. Nat. Sci. Phila., VIII, 1842, p. 292. 



'Loc. cit., VIII, pt. 2, p. 2U3. 



