Richardsoni at Tjovelaiid, Prowers, Ilaxtuiri, Orchard, Boyero, 

 Sl(^rlin<i', Aroya, Florence, Fow1(M', Earl, Ends, Trinidad, Pueblo, 



Animas, Adcna, lioonc and Jicne, and liavin<i' a ^ciici-al dis- 

 ti-ibution in suitable loealities over tlu' eastern half of Ihc State. 



iMontconis at San Acacio, Del Norte and Blanca. 



Warren reports longipcs from western parts of ]\Iontezuma, 

 Monti'ose and Mesa Counties. 



From our observations no rodent that occurs in the San Luis 

 Valley, except the prairie-dog, is so abundant and destructive as 

 the kang-aroo-rat. The ditch banks in this valiey are honeycombed 

 with its burrows, and in a number of cases several hundred yards 

 of ditch banks must be repaired each spring before tliey will hold 

 water used for irrigating purposes. Its burrows are also found in 

 the fields, and the dirt thrown out in some places make mounds 

 as large as a medium sized wash-tub. 



This rat stores large quantities of food in its underground 

 storerooms. As much as a half -bushel of stock peas and other 

 ■seeds have been found in a single burrow. It is very destructive- 

 to grains of all kinds, and in some sections is a serious pest. From 

 our observations, kangaroo-rats have three young at a birth, never 

 more or less. 



SUBFAMILY ZAPODINAE 

 Genus Zapus 



Small rodents with long, tapering tails, coarse bicolored pel- 

 age, and hind legs developed for jumping. 



Fig. 10. Jumping Mouse {Zaptis iJrinceps). From a specimen taken at 

 Elkhorn, Larimer County, .June 11th. Original. M. A. Palmer, Delineator. 



Colorado Species. 



Prairie Jumping-Mouse, Zapus hudsonius campestris. 



Rocky Mountain Jumping-Mouse, Zapus princeps princeps. 



Warren reports campestris from Larimer, Weld, Arapahoe. 

 Jefferson and Boulder Counties, and princeps from La Plata, Sa- 

 guache, Costilla, Boulder, Gilpin, Gunnison and Rio Blanca 

 Counties. I have taken the latter in Larimer County at 8,000 feet 

 elevation. 



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