NATURAL SCIENCES OF PHILADELPHIA. 



303 



Measurements. 



Cricetodipus parvus, Baird (and Peal?). 



? Cricetodipus parvus, Peale, U. S. Expl. Exped. 1848, 53, "pi. 13, f. 2." 



Giebel, Saug. 1855, 600 (compiled from Peale). Gray, P. Z. S. 1868, 



203 (compilation of doubtful references). 

 ? Perognathus {Cricetodipus) parvus, Aud. and Bach., Q. N. A. III. 1854, 



328 (copied from Peale). 

 Perognathus parvus, Baird, M. N. A. 1857, 425 (based on a specimen from 



King's R., Cal., doubtfully referred to C. parvus of Peale). Baird, P. 



R. R. Rep. X. 1859, Williamson's Route, p. 82 (same specimen). 



Diagn. Quite like G. flavus ; tail and feet longer. Hind foot 

 0.70 or more, one-third or more as long as head and body. Tail 

 decidedly longer than head and body the vertebras about 2.50 

 inches, to a body of 2.00. 



Hab. United States west of the Rocky Mountains. Cali- 

 fornia, Utah (and ?Oregon, Peale). 



Of this supposed specie I have but a single specimen additional 

 to the material in Prof. Baird's hands in 1857. This is alcoholic,, 

 in good preservation, and enables me to give the dimensions with 

 accuracy. 



No. 9856, Mus. S. I. 9. Fort Tejon, Cala. J. Xantus. Nose to 

 eye 0.45, to ear 0.70, to occiput 0.90, to tail 2.00 ; tail vertebrae 

 2.50, with hairs 2.75; fore foot 0.25; hind foot 0.70; ear above 

 notch, 0.25. 



