The Mammalia of the Vicinity of Cincinnati. 307 



to the borders of woodland and the vicinit}^ of running water. A 

 specimen taken at Madisonville on Maj^ 13, 1878, contained two well 

 developed embryos. I have observed this species in April still wear- 

 ing the gray or immature pelage, though full grown and apparently 

 mature. 



36. Hesperomys palustris, Baird. — Rice-field Mouse. — On Decem- 

 ber 18, 1876, I took from the stomach of a Red-shouldered Hawk 

 killed at Madisonville, the posterior half of a body with the tail at- 

 tached, which I referred to this species. Indubitable evidence of its 

 former existence in this vicinity is afforded by the recovery of two 

 well-preserved crania from the " ash-pits" in the Madisonville ancient 

 cemetery. For verification of the identity of the latter I am indebted 

 to Dr. Elliot Coues, U. S. A. 



37. Arvicola riparius, Ord. — Meadow Mouse. — Our most common 

 representative of the genus; chiefly confined to marshy meadows over- 

 grown with long matted grass, through which its numerous galleries 

 extend in all directions. On March 21, 1871, 1 removed from a female 

 taken at Madisonville, five embryos, in which gestation had so far 

 advanced that the e3^es and extremities were distinctly visible. 



38. Arvicola austerus, LeConte. — Wood Mouse. — Common. My 

 observations have led me to the conclusion that this species is chiefly 

 confined to wooded or thickety hillsides, where it constructs numerous 

 galleries through and under the fallen leaves and leaf-mold, making its 

 home under some protecting log or stone. 



39. Arvicola pinetorum, LeConte. — Piiie Mouse. — Two or three 

 specimens taken at Brookville, Ind., by Mr. E. E, Quick. 



40. Synaptomys cooperi, Baird. — Cooper's Mouse. — The credit of 

 the discovery of this species in numbers* near Brookville, Ind., now its 

 easternmost recorded habitat, belongs to my friend Mr. Edgar R. Quick, 

 who took his first specimen along a railroad embankment on February 

 10, 1878. He subsequently found a large colony inhabiting an abori- 

 ginal stone mound and its vicinity on the summit of the eminence 

 known as "Brown's Hill," an elevation rising some two hundred and 

 fifty feet above the Whitewater river which flows at its base. In 

 March, 1880, I had the pleasure of visiting the locality in company 

 with Mr. Quick, and observing the species for the first time in its 

 native haunts. We found them distributed over an acre or two of the 

 hillside, and apparently more numerous in and about some marshy 



* A single specimen (date unknown) had previously been taken near the same locality, 

 by Dr. Rufus Raymond, and by him forwarded to the Smithsonian Institution. 



