CITELLUS. 31 



Measurements. Total length, 263; tail, 61; hind foot, 35. Skull: 

 Occipito-nasal length, 41; Hensel. 35.0; zygomatic width, 27.3; 

 intertemporal width, 10; length of nasals, 12.9; length of upper molar 

 series, 9; length of mandible, 22.2; length of lower molar series, 8.4. 

 Ex type in United States National Museum. 



Citellus leurodon Merriam. 



Citellus leurodon Merr.. Proc. Biol. Soc. Wash., XXVI, 1913, p. 136. 



Type locality. Murphy, southwestern Idaho. 



Genl. Char. Like C. idahoensis, tail shorter, underparts white. 



Color. Almost exactly like the gray phase of C. idahoensis, but 

 the flanks and underparts are white not buff, the black bases of the 

 hairs showing and dulling the white; tail buffy gray above, darker 

 beneath; hands and feet white. Ex type in United States National 

 Museum. 



Measurements. Total length, 233; tail, 47; hind foot, 33. Skull: 

 Occipito-nasal length, 37.7; Hensel, 32.2; zygomatic width, 24.1; 

 intertemporal width. 8.6; length of nasals, 12.7; length of upper molar 

 series, 8.2: length of mandible, 19.6; length of lower molar series, 8. 

 Ex type United States National Museum. 



Citellus canus vigilis Merriam. 



Citellus canus vigilis Merr., Proc. Biol. Soc. Wash., XXVI, 1913, 



P- 1,37 

 Type locality. Vale, eastern Oregon. 



Genl. Char. No dappling on back; tail shorter and paler than in 

 C. idahoensis. Color 'more hoary-whitish than in C. canus. Skull 

 larger and heavier. 



Color. General hue hoary-whitish lined with black; flanks and 

 underparts whitish; tail like back, terminal part black, hairs tipped 

 with white; thighs to feet : eddish; tail above, buff, hairs on margin 

 and tips with white ends; beneath darker. Ex type in United States 

 National Museum. 



Measurements. Total length; 208; tail, 33; hind foot, 32. Skull: 

 Occipito-nasal length, 37.5; Hensel, 31; zygomatic width, 25.6; inter- 

 temporal width, 10 ; length of nasals. 12.7; length of upper molar 

 series, 7.7; length of mandible, 22; length of lower molar series, 7.3. 

 Ex type in United States National Museum. 



Citellus mollis artemisiae Merriam. 



Citellus mollis artemisicB Merr., Proc. Biol. Soc. Wash., XXVI, 



1913, P- 137- 

 Type locality. Birch Creek, Idaho. 



