]4'!''sta } ^^^^ HISTOKY OF THE KANGAROO EAT. 7 



dusty sand, they soon recover their normal sleek appearance. Ap- 

 parently the former condition is due to an excess of oil, the latter 

 to the absorj^tion of the excess in a dust bath. The oil is doubtless 

 an important adjunct to the preservation of the skin and hair amid 

 the dusty surroundings in which the animal lives. 



MEASUREMENTS AND WEIGHTS. 



External measurements include : Total lengthy from tip of nose 



ERRATUM. 



Page 7. Change first line of third paragraph under " Measure- 

 ments and weights," to read— 

 Average 'rn^aswements of 30 adult specimens of both sexes: 

 (The first line of the succeeding paragraph is correct.) 



107600—22 



averaged 112.9 grams (131.9r-98.0). 



Averages for 13 adult males : Total length, 326 millimeters (345- 

 311) ; tail vertebrae, 187.8 (202-168) ; weight, 116.8 grams (129-100). 



There appears to be no significant difference in the measurements 

 and weights of males and females, with the possible exception of the 

 comparison of adult males and adult nonpregnant females. 



OCCURRENCE. 



GENERAL DISTRIBUTION. 



Dipodomys spectabilis specfahilis is found in southeastern Ari- 

 zona, in northwestern, central, and southern New Mexico, in ex- 

 treme Avestern Texas, in northern Sonora, and in northern and 

 central Chihuahua (Fig. 1). A subspecies, D. s. cratodon Merriam, 

 has been described from Chicalote, Aguas Calientes, Mexico, the 

 geographic range of which lies in central Mexico in portions of the 

 States of Zacatecas, San Luis Potosi, and Aguas Calientes. 



HABITAT. 



In the Tucson region spectahilis is typically a resident of the Lower 

 Sonoran Zone. This is perhaps the principal zone inhabited over 

 its entire range, but the animal is often found in the Upper Sonoran 

 also, and in the Gallina Mountains of New Mexico Hollister found it 



