20 



NOETH AMEBICAN FAUITA. 



[No. 36. 



the typical race shades insensibly into the subspecies merriami of the 

 Mississippi Valley, Specimens from North Carolina and Virginia, as 

 might be expected, exhibit the specific characters in their most pro- 

 nounced form, the color of the upperparts being uniformly brownish. 

 Specimens from Florida are intermediate but nearer on the whole to 

 liumulis. In a series of three from Kissiromee one is clearly Tiumulis, 

 while the others might without impropriety be referred to merriami. 

 The skulls, however, are nearer to liumulis. The type of ^'dickinsoni,^' 

 from Willow Oak, is a very dark specimen, but is in the uniform sooty 

 pelage indicative of immaturity. It is closely similar to numerous in- 

 dividuals of merriami examined from Alabama and Louisiana. A 

 single specimen from Tarpon Springs, however, can be exactly matched 

 by specimens of Tiumulis from the coast of Georgia. In the absence 



Tig. 1. — Distribution of Eeithrodontomys humuUs, R. albescens, and subspecies. 



of suitable material the west Florida form is provisionally referred to 

 liumulis, but a larger series may show it to be nearer merriami. 



Specimens examined. — Total number, 96, from the following locali- 

 ties: 



Virginia: Dismal Swamp, 17. 



North. Carolina: Chapanoke, 1; Currituck, 4; Moran, 1; Raleigh, 53. 



South Carolina: Georgetown, 1. 



Georgia: Riceboro (Le Conte Plantation), 8. 



Florida: Enterprise, 1;^ Gainesville, 4;^ Kissimmee, 3; Sawgrass Island, Polk 

 County, 1; Tarpon Springs, 1;^ Willow Oak, Pasco County, l.^ 



REITHRODONTOMYS HUMULIS IMPIGER Bangs. 

 Small-eared Harvest Mouse. 

 Reithrodontomys lecontii impiger Bangs, Proc. Biol. Soc. Wash., XII, 1898, p. 167. 

 Type locality. — White Sulphur Springs, W. Va. 

 Distribution. — Northern Virginia and mountains of West Virginia. 



1 CoUection Field Mus. Nat. Hist. 



s Collection Acad. Nat. Sci. Pbila. 



