DESCRIPTION OF A NEW CHIPMUNK. 27 



ing continuous with the white spot behind the ear ; below this 

 still is another rusty umber stripe which ends against the white 

 just back of the ear. 



Measurements. — The twelve specimens before me are all 

 skins, but they are well prepared and affoi-d measurements which 

 may be regarded as approximately correct. The length of head 

 and body varies from 125 to 140 mm. and the tail with hairs 

 from 105 to 130 mm. The hind foot with claw averages be- 

 tween 34 and 35 mm. 



Cranial Characters. — The nasal bones are both relatively 

 and absolutely longer in macrorhabdotes than in its nearest ally, 

 townsendi, notwithstanding the fact that the latter is the larger 

 animal. The longest nasal in the four skulls of townsendi before 

 me measures 11.00 mm., while the smallest of five adult macro- 

 rhabdotes measures 12.60 mm. and the largest 13.20 mm. The 

 nasals usually project backward in macrorhabdotes beyond the 

 line of the fronto-premaxillary suture, while in tozvnsendi they 

 generally end flush with the suture. Their ratio to the basilar 

 length in townsendi is 35.73 mm. (average of two) , against 

 44.54 in macrorhabdotes (average of five fairly adult specimens). 

 In addition to their shortness, the nasal bones in townsendi aver- 

 age a little broader, particularly behind ; thus the average width 

 (at the fronto-premaxillary suture) of four specimens of town- 

 sendi is 3.27 mm., while the average of eight specimens of macro- 

 rhabdotes is 2.85 mm. Hence the average of the ratios of the 

 posterior breadth of the nasal bones to their length in nine skulls 

 of macrorhabdotes is 22.97, while in four skulls of tozvnsendi it 

 is 30.75. 



Interorbitally, the frontal bone averages somewhat broader in 

 macrorhabdotes than in townsendi. The palate is longer in the 

 latter. The average ratio of the length of the palate to the ba- 

 silar length in eight specimens of macrorhabdotes is 53.96, 

 while in two specimens of townsendi it is 56.80. 



