210 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Measurements of one hundred specime^is of Arvicola riparius and A. austerus— Cont'd. 



292 



203 



294 



2G5 



296 



297 



298 



299 



300 



301 



302 



303 



304 



303 



30G 



307 



308 



309 



310 



3il 



312 



31i 



314 



315 



310 



317 



318 



319 



320 



321 



32.2 



323 



3-.i4 



3-J5 



320 



327 



3j8 



329 



3^0 



331 



33 J 



333 



334 



335 



3:>6 



3L!7 



338 



339 



3J0 



341 



342 



343 



344 



345 



346 



347 



348 



349 



350 



351 



3j2 



353 



354 



355 



356 



357 



358 



From tip of nose to- 



0.46 



0.40 



0.43 



0.43 



0.41 



0.4c: 



0.44 



0.40 



0.44 



0.40 



0.44 



0.45 



0.40 



0.40 



0.40 



0. 45 



0.45 



0.42 



0.45 



0.45 



0.42 



0.45 



0.43 



0.45 



0.49 



0.40 



0.42 



0.40 



0.42 



0.42 



0.43 



0.45 



0.43 



0.40 



0.42 



0.44 



0.43 



0.41 



0.40 



0.43 



0.46 



0.43 



0,43 



0.41 



0.42 



0.45 



0.41 



0.44 



0.40 



0.41 



0.40 



0.42 



0.42 



0.42 



0.41 



0.44 



0.44 



0.43 



0.40 



0.45 



0.42 



0.39 



0.40 



0.46 



0.43 



0.44 



0.41 



0.87 



0.83 



0.87 



0.82 



0.89 



0.69 



0.91 



0.80 



0.85 



0.86 



0.86 



0.88 



0.85 



0.83 



0.85 



1.00 



0. 95 



0.91 



0.85 



0.91 



0.89 



0.85 



0.81 



0.96 



0.98 



0.84 



0.86 



0.90 



0.90 



0.93 



0.91 



0.94 



0.92 



0.85 



0.86 



0.90 



0.91 



0.93 



0.85 



0.92 



0.97 



0.86 



0.84 



0.85 



0. 85 



0. £0 



O.s'2 



0.90 



0.84 



0.81 



0.81 



0.89 



0.93 



0.83 



0.92 



0.96 



1 CO 



0.89 



0.96 



0.89 



0.86 



0.84 



0.84 



0.90 



0.89 



0.99 



0.82 



1.22 

 1.08 

 1.18 

 1.20 

 1.20 

 1.15 

 1.20 

 1.12 

 1.15 

 1.15 

 1.15 

 1.24 

 1.16 

 1.15 

 1.16 

 1.25 

 1.15 

 1.15 

 1.15 

 1.33 

 1.19 

 1.17 

 1.14 

 1.31 

 1.34 

 1.10 

 1.15 

 1.13 

 1.25 

 1.20 

 1.22 

 1.19 

 1.22 

 1.10 

 1.16 

 1.18 

 1.18 

 1.14 

 1.13 

 1.15 

 1.20 

 1.15 

 1.20 

 1.18 

 1.24 

 1.12 

 1.19 

 1.20 



l.OrS 



1.13 

 1.14 

 1.17 

 1.27 

 1.11 

 1.23 

 1.32 

 1.23 

 1.21 

 1.17 

 1.28 

 1.12 

 1.00 

 1.08 

 1.37 

 1.12 

 1.20 

 1.15 



4.10 

 3.70 

 3.90 

 3.60 

 3.95 

 3.70 

 4.00 

 3.70 

 3.95 

 3.50 

 3.70 

 4.20 

 3.65 

 3.70 



3 85 



4 05 

 4.00 

 3.95 

 4.00 

 3.85 

 3.70 

 3.80 

 3.80 

 4.50 

 4. CO 

 3.65 

 3.80 

 3.70 

 3.85 

 3.90 

 4.10 

 3.85 

 3. GO 

 3.60 

 3.90 

 3.80 

 3.90 

 3.70 

 3.60 

 3.80 

 4.35 

 3.70 

 3.85 

 3.80 

 3.75 

 3.85 

 3.70 

 3.70 

 3.50 

 3.80 

 3.65 

 3.80 

 4.00 

 3.50 

 4.10 

 4.10 

 4.20 

 3.80 

 3. CO 

 4.20 

 3.70 

 3.50 

 3.60 

 4.40 

 3.70 

 3.95 

 3.60 



1.80 

 1.25 

 1.30 

 1.45 

 1.55 

 1.30 

 1.30 

 1.45 

 1.50 

 1.30 

 1.45 

 1.50 

 1.55 

 1.40 

 1.20 

 1.55 

 1.45 

 1.45 

 1.45 

 1.60 

 1.55 

 1.45 

 1.55 

 2.20 

 1.95 

 1.43 

 1 35 

 1. 35 

 1.45 

 1.55 

 1.85 

 1.55 

 1.45 

 1.30 

 1.45 

 1.40 



1. .55 

 1.40 

 1.40 

 1.35 

 1.20 

 1.35 

 1.40 

 1.40 

 1.50 

 1.45 

 1.3. 

 1.30 

 1.30 

 1 40 

 1.50 

 1.45 

 1.50 

 1.30 

 1.70 

 1.80 

 1.75 

 1.40 

 1.25 

 l.r5 

 1.25 

 1.20 

 1.30 



2. 20 

 1.40 

 1.40 

 1.65 



Length of- 



0.44 



0.40 



0.45 



0.40 



0.40 



0.42 



0.41 



0.41 



0.44 



0.40 



0.44 



0.41 



0.41 



0.41 



0.43 



0.44 



0.41 



0.41 



0.43 



0.41 



0.43 



0.40 



0.40 



0.43 



0.47 



0.42 



0.45 



0.41 



0.42 



0.43 



0.43 



0.44 



0.42 



0.41 



0.41 



0.40 



0.44 



0.41 



0.40 



0.44 



0.41 



0.43 



0.42 



0.41 



0.44 



0.42 



0.41 



0.44 



0.44 



0.41 



0.40 



0.43 



0.41 



0.41 



0.41 



0.44 



0.43 



0.41 



0.41 



0.45 



0.43 



0.39 



0.41 



0.41 



0.40 



0. 41 



0.41 



0.71 



0.70 



0.76 



0.70 



0.75 



0.73 



0.71 



0.72 



0.77 



0.68 



0.74 



0.73 



0.72 



0.71 



0.70 



0.76 



0.74 



0.75 



0.75 



0.77 



0.76 



0.73 



0.71 



0.75 



0. 70 



0.70 



0.76 



0.74 



0.76 



0.75 



0.72 



0.74 



0.73 



0.72 



0.72 



0.70 



0.75 



0.75 



0.70 



0.75 



0.76 



0.71 



0.74 



0.73 



0.71 



0.72 



0.70 



0.75 



0.72 



0.72 



0.71 



0.75 



0.73 



0.71 



0.76 



0.76 



0.74 



0.72 



0.72 



0.77 



0.70 



0.69 



0.72 



0.77 



0.70 



0.74 



0.70 



0.14 



0.14 



0.14 



0.14 



0.14 



0.14 



0. 14 



0. 14 



0.13 



0.14 



0.14 



0.14 



0.14 



0.13 



0.14 



0.15 



0.13 



0.14 



0.14 



0.14 



0.15 



0.15 



0.14 



0.14 



0.16 



0.14 



0.15 



0.15 



0. 14 



0.14 



0.15 



0. 14 



0.13 



0.14 



0.14 



0.14 



0.13 



0.14 



0.14 



0.14 



0.14 



0.14 



0.14 



0.14 



0. 14 



0. 14 



0.14 



0.14 



0.14 



0.14 



0.13 



0.14 



0.14 



0.13 



0.14 



0.14 



C. 15 



0.15 



0. 14 



0.15 



0.14 



0. 13 



0. 14 



0. 15 



0.14 



0.13 



0.14 



Eemarks. 



Probably A. riparius. 



Probably A. riparius. 



Probably A. riparius. 



Probably A. riparius. 



Probably A. riparius. 

 Probably A. riparius. 



Probably A. riparius. 



I have no idea that all the above specimens not marked as probably 

 A. riparius are A. amterus. Examination of the molars would prob- 

 ably reveal that both are included in the list indiscriminately. 



With all these specimens before me in the flesh, I was at first inclined 



