Cockerel I, Miller and Print: — Lengthsof fnfi Mi nes in Rodents. 207 



Peromyscus maniculatus rufinus (Merriam). 



Collected by I". R. Warren at Medano Ranch, Costilla Co., Colorado, 

 June 21, L909. Ratios: 37 (2); 39 (1); 40 (1); 41 (1); 46 (1); 54 (1); 

 55 ( 1 ): 57 (1). The small intestine varies from 19 to 30 cm.; the large 

 from 10 to 15. This is a mure variable lot than the rowleyi, and the 

 ratios are quite different. However, some P. m. rufinus collected at 

 Boulder showed rather different figures, the actual measurements being 

 44.5-14; 35.8-14.21 ; 31-11. The variation here is still further away from 

 rowleyi. 



Cratogeomys castanops (Baird). 



Mr. John Gutberlet has some interesting data on this species, which we 

 hope he will eventually publish. It is the only one in which the large 

 intestine was found to be longer than the small, the ratios (from Gutber- 

 let's measurements) being: 103(1); 125(1); 12<>(1); 140(1); 143(1); 

 146 ( 1 ). The small intestine varied from 34.3 to 47 cm. ; the large from 

 48.3 to 61. 



Perodipus montanus (Baird). 



Collected by E. R. Warren at Medano Ranch and Hooper, Colorado. 

 Ratios : 43 ( 1 ) ; 45 ( 1 ) ; 47 ( 1) ; 61 ( 1 ) ; 0(5 ( 1 ) ; 70 ( 1 ) . Small intestine 

 from 26.2 to 44 cm.; large from 17.4 to 21.2. A variable lot; the one 

 with ratio 100: 70 came from Medano Ranch. In this animal the right 

 inferior lobe of the lung has no small pointed lobule beneath, such as is 

 found in other genera examined by us. 



The following measurements (in cm. , the first figure the small intestine) 

 relate to miscellaneous species, of which we possess only one or two 

 specimens : 



Fiber zibethicus cinnamominus Hollister (Boulder) . . 101-77.3. 

 Neotoma cinerea orolestes (Merriam) (Gregory Canon) . 77-70. 

 Citellus grammurui (Say) (Boulder Canon, 6000 ft., J. J. Blanchard) 



146.5-58. 

 Eutamias operarivs (Merriam) (Boulder Canon) 51.3-25.4 and 65.7-36.1. 

 Eutumias guadrivitlatus ( Say) ( Howard, Colo., E. R. "Warren ) . 67.5-3!). 

 The ratios for the chipmunks are nearly the same, all falling between 

 •".(I and 58. 

 Onychomys melanophrys pallescens Merriam. (Hooper, Colo., E. R. 



Warren) . . 27.8-7.5, and one measured by Gutberlet . . 26.7-8.9. 

 Thomomya talpoides agrestis Merriam. (Gutberlet's measurements) 



35. 6-33. 



The high ratio (about (».'!) indicates some approach to the condition of 

 Cratogeomys. 



The smallest ratio known to us is 100 : 9 for Dasyprocta aguti, based on 

 the measurements by Prof. R. Jones, referred to by Mivart and Muric, 

 Proc. Zool. Soc. Lond., June, 1866. That for I), crislata, as reported by 

 these authors, would be about 100 : 22. 



