96 



MONOGRAPHS OF NORTU AMERICAN RODENTIA. 



• if, there are no synonymical points to be determined in this case. There 

 are, however, several discrepancies between the description of Audubon and 

 Bachman and the characters of the animal which Hoy, Kennicott, Baird, and 

 ourselves describe. Thus, they say, "mammae, six pectoral and four abdom- 

 inal." We fail to realize "cheeks yellow," though, perhaps, they are a little 

 brighter than surrounding parts. The dimensions given, 4 inches for length 

 of bead and body, are so much greater (by a full inch) that possibly the fig- 

 ure "4" may be a typographical error; but then the tail, 2£, is nearly as much 

 in excess of what we find. It is barely possible, after all, that, as Professor 

 Baird hints, none of our specimens are what Audubon and Bachman called 

 michiganensis. In that event, and if positively distinct from Audubon's and 

 Bachmaii's animal, they would, of course, bear the name of "bairdii", and 

 "michiganensis" And & Bach, be relegated among the unnumbered synonyms 

 of leucopus. But, in the seeming impossibility of determining this point, it is 

 better to let michiganensis stand for what we now describe. 



Table XXVI. — Measurements of forty-sewn (and lUt of other) specimens of HEsrEROMYS michiganensis. 



'9950: labeled "cognatUS 1 



