302 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



tered until we had crossed the Western Desert and reached the rocky 

 base of the Coast Range Mountains in California. 



Habits. — Iti the vicinity of El Paso these ground-squirrels were 

 abundant, living among rocks and cliffs on both sides of the Rio 

 Grande, in Texas and Chihuahua. They were readily taken in traps 

 baited with cheese. 



Measurements of S3 specimens of the AmmospermojMlus leucurus group. 



Locality. 



Sex and 





•SB 



(a d 

 M 



Ammosyermophilus leucurus. 



Grand Canyon of the Colorado, 

 near Pine Springs, Arizona, 



First "water, at east base of 

 Coast Range Mountains, near 

 Mexican Boundary Line. 



do 



do... 



Mountain 



County, California. 

 do 



Spring, San Diego 

 Lli- ■ 



.do. 

 .do. 

 .do. 

 .do. 



Jaeumba, San Diego County, 

 California. 



.do. 

 .do. 



First water, at east base of 

 Coa.«t Range Mountains, near 

 Mexican Boundary Line. 



Mountain Spring, Pan Diego 

 County, California. 



do 



do 



do '... 



Jaeumba, San Diego County, 

 California. 



.do. 

 .do. 

 .do. 

 -do. 



AmmospermopkUus leucurus in- 

 lerpres. 



El Paso, Texas 



do 



-do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



1884. 

 Nov. 16 



1894. 

 May 7 



May 8 

 May 9 

 May 12 



May 13 

 May 14 

 ....do... 

 May 15 

 May 16 

 May 22 



May 24 

 ...do... 

 May 8 



May 9 



May 13 

 ..do.... 

 ..do.... 

 May 19 



May 20 

 May 23 

 May 24 

 ..do.... 



1892. 

 Feb. 8 

 Feb. 11 

 Feb. 19 

 Feb. 20 

 Feb. 21 

 ...do... 

 Feb. 23 

 Feb. 27 

 Mar. 2 

 Mar. 3 



cTad. 

 ?ad. 



? im. 

 cfad. 

 9 ad. 



5 ad. 

 cf juv. 

 fad. 

 cfad. 

 cTad. 

 ?ad. 



9 ad. 

 9 ad. 

 rS im. 



9 ad. 



9 ad. 

 rt9ad. 



"?■ 

 9 ad. 



d9ad. 

 cfad. 

 9 ad. 

 cTad. 



cfad. 

 cTad. 

 cTad. 

 9 ad. 

 cf ad. 

 cf ad. 

 9 ad. 

 ,f ad. 

 cfad. 

 cfad. 



mm. 

 6231 



191 

 219 



216 



213 

 130 

 222 

 225 

 195 

 230 



217 

 220 

 199 



221 



206 

 206 

 213 

 227 



206 

 228 

 220 

 232 



227 

 227 

 226 

 200 

 220 

 213 

 217 

 227 

 226 

 C) 



Tnm.. 

 61 



65 



70 

 42 

 72 

 74 

 c50 

 73 



73 

 76 

 61 



mm,. 

 36 



37 



40.6 

 38 



38.5 

 36 : 



mm. 

 4.5 



4.5 



6.5 

 6 



6.2 

 6.6 

 5.5 



6.5 

 6.5 



I 6.7 



i '■' 

 I 6.5 



6.6 



6 



5.5 



5.5 



6.5 



6 



5.6 



6.7 



6.3 



" American Museum of Natural History. 

 '' End of tail gone. 



«Tail abnormal, 

 s MammEe five pairs, 



e Head and body, 153 mm. 



