MAMMALS OF PENNSYLVANIA AND NEW JERSEY. 63 



expecting to hibernate, with the exception of the fourth young male, in this 

 retreat. Of course this is only circumstantial evidence, but it is probable, as 

 the four young were hardly able to hew out among those rocky fastnesses a 

 retreat for themselves that year. In this same locality, though snow and hard 

 freezing weather intervened, the chipmunks would respond to a thawing, 

 sunshiny day as late as the loth of November, about the time we returned to 

 Pittsburgh. That the chipmunk varies its vegetable diet of nuts, seeds, grain, 

 buds and fruit with entrees of animal food is noteworthy. They not only eat 

 insects, snakes, mice, birds, eggs and various species of shelled snails, but 

 have been known to devour each other when wounded or caught in a trap. 

 As they are exceedingly abundant in many parts of the Transition zone, and 

 very fond of grain, those fields of wheat, oats and maize, etc., bordering upon 

 woodland suffer not a little from their thefts, but as their main food supply is 

 taken from nature's spontaneous gifts their economic status is not a serious 

 problem. On the other hand, they are by far the most numerous, entertain- 

 ing, confiding and innocent of the very few diurnal mammals which continue 

 to exist in our populated districts. 



Description of species. — It will be sufficient to merely note the differences 

 distinguishing true striatus from its more northern representative lysteri. 

 The latter is rather longer tailed, has a longer hind foot but does not seem so 

 heavily built ; more slender bodied. In fact the differences in measure- 

 ments are so slight in averaging a large series of each that I think the hind 

 foot the only reliable test. In color lysteri is lighter (grayer) above, the 

 crown being yellowish rusty instead of rusty brown and the back clear ash 

 gray lacking the dark chestnut rump of striatus. The back stripes are also 

 less clearly contrasted and the under surface of tail buffy instead of dark hazel. 



Measurements {striatus). — Total length, 235 mm. {(}% in.) ; tail vertebrae, 

 88 (3tV) •> hind foot, 35 (i^^) : {lysteri) 235 {g%) ; 90 (3>4) ; 35 (i^). 



Genus Arcotomys Schreber, Saugthiere, vol. 4, plates 207 to 211. 



Southeastern Woodchuck or Ground Hog. Arctomys monax (Lin- 

 naeus). 



1758. \_Mus'\ monax Linnaeus, Systema Naturae, vol. i, p. 60. 



1 780. Arctomys monax Schreber, Saugthiere, vol, 4, plate 208. 



Type locality. — Maryland. 



Faunal distribution. — Upper Austral and Transition zones ; Massachusetts 

 to Georgia ; west almost to the plains. 



Distribution in Pa. and N. J. — More or less abundant in all localities from 

 tide water to mountain top in Pa. within the limits of the Upper Austral and 

 Transition zones, being replaced in the Canadian zone by subspecies 



