1897.] NATURAL SCIENCES OF PHILADELPHIA. 305 



The following is a list of the species seen or ohtained by Mr. 

 Young, with annotations on each. 



1. Lepus sp?. Hare. 



" Only a few individuals of this genus were noted. They were 

 probably sylvaticus, but as none were secured this is uncertain. L. 

 palustris may also occur." 



2. Synaptomys cooperi stonei (Rhoads). Carolinian Bog Vole. 

 Synaptomys helaletes Merriam. Proc. Biol. Soc. Washn., 1896, p. 59. 



" Two specimens, male and female, the latter containing four well 

 advanced embryos, were taken in a patch of Juncus setaceus in a 

 damp piece of open ground bordering pine woods at Chapanoke, 

 March 11, 1897. The runways were filled with cut stems of the 

 Jvncus, on which they had evidently been feeding." 



The identification of these Synaptomys has necessitated a careful 

 examination of a series of about forty accurately measured and well 

 preserved skins and skulls of cooperi from eastern North America 

 from New Brunswick to Rflan Mountain, North Carolina, a few of 

 which are in the collection of the American Museum of Natural 

 History, New York, but the majority were collected by the senior 

 author in Pennsylvania and New Jersey. By means of this excep- 

 tional series from the debatable region lying between the northern 

 and southern extremes of the eastern distribution of cooperi, to- 

 gether with the data presented by Dr. Merriam's " Revision " of 

 the genus (I.e.), the following conclusions have been reached : — 



1. The type locality of Synaptomys cooperi, according to the 

 known history of the original (type) specimen and the published 

 consensus of recent naturalists, may be defined as lying within a 

 radius of fifty miles of Hoboken, New Jersey, either in northern 

 New Jersey, southern New York or eastern Connecticut. 



2. Synaptomys cooperi Baird, is represented by the following spe- 

 cies and subspecies : — 



a. Cooper's Bog Vole. Synaptomys cooperi Baird ; Mam. N. 

 Amer., 1857, pp. 556-558. 



Type locality unknown ; probably northern New Jersey or south- 

 ern New York. 



Geographic distribution. — Lower Alleghenian fauna, 2 intergrad- 

 ing southwardly into subspecies stonei, northwardly into subspecies 



2 Dr. J. A. Allen's nomenclature of faunal .areas is here used. 



