to6 MAilAlALS OF PfiNNSYLVANfA AND NEW jEfeSiV. 



season. This is not always the case. On the! brackish tid« ftiarShes of Cdhan- 

 sejr Cfeek, Cumberland Co., N. J., I found thes6 rat hous^§ tenanted by other 

 itthabitantiS of the rtiarSh. The ftieadow mice, least Shfews, and tnafsh fat 

 {Oi^SoMp) had their galleties itt the base ^ttd ttests ill the tOf) of the hottse, 

 ail three living in brie house *vif h the mttskrat.> The eggS of the SnaJ)|yef and 

 teridt)ift ate also foimd in these houses, AM a lafge cWb's remains »ef e bften 

 found. The latter may have been brought there, howevet, td be eatefl by the 

 muskrits. Iti fat notthem climates, these houses are built over watet of Suf- 

 ficieflt depth ttj iiisute agdiist a free2;ihg oUt. Hedtne states that the tats are 

 sometimes frozen iri and all perish becatise df the great size afid hatdness of 

 the outer doitie, which also resists the external attacks of Wild animals. 



DescHpiidn of species. ^^OVix Pa. and N. J. muskrat diffefs from Othet nom^ 

 inal forms So slightly as to often be indistiuguishabie from them. It needs 

 no description here, being so different frotn any other mammal. 



Genus Synaptomys Baifd, Mammals of Notth Ametica, fSs;^, p. ggS. 

 CdoJieii:"g Lenlffliiil^. SyHaptomys cooperi Baitd. 



185 f. Synaptomys cooperi Baiidf Mammals of N* Amer., p. 558. 



Type locality e^-^oX. known. Type presented by Cooper of Hoboken, 

 Nj J. I probably captured in N. J/ or N. Y. near New York City. 



Faunal distiibutionf^ljyiiet Canadian and transition zones, N. England 

 to Mississippi valley. 



Distribution in Pa. and N. ^.^East of the Alleghanies in Pa. I have 

 not found this rare animal except in the upper transition zone and lower 

 edge of the Canadian^ One was taken in the Ohio valley (upper austral 

 zone) in Beaver Co., in similar Situation to those taken by Quick and Butler 

 in Indiana. In N. J. it is^ strictly speaking, confined to the transition zone, 

 beponring modified in the cedar swamps of southern N. J. into the race stonei. 



Habits f description of species ^ etc. — See next article. 



Specimens examined.-^'Pa.. : Beaver Co., Beaver, i. Cambria Co*, Kings, 

 S ; Ctessonj 3. Clinton Co.y Mt. above Round Isl., 7. Monioe Co., near 

 Cresco, i. Sullivan Coi, Lake Leigh, i. 



Stone's Lemming. Synaptomys cooperi stonei (Rhoads). 



i80j. Syhdpiomys stonei Rflbids, American Naturalist, vol. 27, p. 53. 



1897. SytidptoMys cooperi stonei Rhdads, Ptoc. Acad. N. Sci., Phila., p. 

 ^gi ', also ibid., ^&^^, p. 305. 



Type iodMfy.-^U.3.y'5 Landitlg, Atlantic County, N. Jersey. 



PdUhdl diiirl6ittiott.T-%ph&gaata bogs, upper austral zone, eastern botder, 

 ^dutherrt N. J. to Lake Dtummorid, Va. 



