b.—alascensis. {Zapus), Merr. Proc. Biol. Soc. Wash., 1897, p. 223. 



Type locality. Yakutat, Alaska. 



Geogr. Distr. Yakutat Bay north to Yukon River; limits un- 

 known. 



Genl. Char. Larger and darker than typical Z. hudsonius. 



Color. Dorsal area distinct, dark mixed with brownish; sides 

 dark ochraceous mixed with black; beneath white; tail bicolor. 



Measurements. Total length, 218; tail vertebra', 132; hind 

 foot, 31.5. 



c.—americanus. {Dipus), Barton, Am. Phil. Soc, 1799, Iv, p. 115. 



Type locality. Philadelphia, Pa. 



Geogr. Distr. From Raleigh, North Carolina, north to southern 

 Connecticut and valley of lower Hudson. 



Genl. Char. Similar to and smaller than Z. hudsonius; dorsal 

 area less distinct. 



Color. Summer Pelage. Above deep ochraceous; dorsal area in- 

 distinct mixed with black; ear nearly black; sides of head paler, feet 

 and under parts white tinged with ochraceous. 



Fall Pelage. Dorsal area mixed with yellowish; sides dull yel- 

 lowish. 



Measurements. Total length, 191. 3; tail vertebrEt, 115.4; hind 

 foot, 28.3. 



d. — campestris. (Zapus), Preble, N. Am. Faun., 1899, No. 15, p. 20. 



Type locality. Bear Lodge Mountains, Wyoming. 



Geogr. Distr. Great Plains from Manitoba south to Nebraska, 

 west to Colorada and Wyoming. 



Genl. Char. Larger than Z. hudsonius. and brighter. Skull gen- 

 erally larger in relative proportions. 



Color. Summer Pelage. Dorsal area distinct, suffused with och- 

 raceous buff; sides ochraceous buff; feet and under parts white; tail 

 dark gray above,, yellowish white beneath. 



Measurements. Total length, 222 ; tail vertebra', 185 ; hind 

 foot, 30.5. 



395. tenellus. {Zapus), Merr. Proc. Biol. Soc. Wash., 1897, No. xi, 

 p. 103. 



Type locality. Kamloops, British Columbia. 



Geogr. Distr. Known only from type locality. 



Genl. Char. Small; ears large; color dark. 



Color. Pall Pelage. Similar to Z. hudsonius but darker; dorsal 

 area as in species mentioned; sides olive yellowish, lined with black; 

 tail bicolor; outside of fore leg and thigh dusky; feet and lower parts 

 whitish. 



