1897.] NATURAL SCIENCES OF PHILADELPHIA. 307 



Measurements. — Average of nine adults, 4 females and 5 males, 

 from the following localities: New Jersey, Cumberland Counfy, 3 ; 

 Cape May County, 1 ; Atlantic County, 3 ; North Carolina, Per- 

 quimans County, 2 ; total length 125 m. m. ; tail vertebrae 20 ; hind 

 foot 20. Skulls of two adult males from southern New Jersey ; greatest 

 length 27.8 ; greatest breadth 17.7. A large adult male skull from 

 Chapanoke, North Carolina, is 28.5 millimeters long by 18 broad, 

 and represents the extreme maximum size of the Dismal Swamp 

 form which Dr. Merriam named (J. c.) helaletes. 



d. Great Plains Bog Vole. Synaptomys cooperi gossi (Merriam). 

 Proa' Biol. Soc. Washn., 1896, p. 60. 



Type locality. — Neosho Falls, Kansas. 



Geographic distribution. — Great Plains fauna. 



General characters* — Similar to cooperi but larger, with relatively 

 small audital bullne. Dentition heavy, as in stonei. Color above, 

 decidedly shaded with reddish-brown. 



Measurements. — Average of 6 specimens from type locality ; total 

 length 120 m. m. ; tail vertebras 20.5 ; hind foot 19. Skull measure- 

 ments, not available. 



3. Microtus pennsylvanicus nigrans Rhoads, subsp. no v. Albemarle Meadow 

 Vole. 



Type, No. 3,494 ad. $ , Col. of S. N. Rhoads. Collected by R. 

 T. Young at Currituck, Currituck County, North Carolina, April 

 7, 1897. 



General characters. — Similar to Microtus pennsylvanicus of east- 

 ern Pennsylvania and New Jersey, but larger and darker, with a 

 nearly unicolor tail and distinctly sulcate upper incisors in the 

 majority of adult skulls. 



Colors. — Above dark brownish slate-black, with a well defined 

 darker median dorsal area of slaty-black, but sparingly mixed with 

 the dark brown of sides. Dark brown of sides extending around 

 and over lower parts from lips to vent, leaving no line or area of 

 demarcation between upper and lower body colors as in pennsylva- 

 nicus, and in the series of 9 specimens examined, showing little trace 

 of the ashy or hoary cast of underparts so conspicuous in 90 per 

 cent, of a large series from eastern Pennsylvania, northward. Cra- 

 nial characters as in pennsylvanicus. 



4 These characters and measurements are chiefly summarized from Dr. Mer- 

 iram's " Revision " of the genus. I personally examined all the Goss specimens 

 and can confirm the color diagnosis. — S. N. R. 



