Cheyenne, 6500 ft., 1; Cheyenne, 7 (U. S. N. M.); 1 mi. S and 4-1/2 mi. E Cheyenne, 5200 ft., 1; 2 mi. S and 9-1/2 mi. E Cheyenne, 5200 ft., 3; Arcola, 5200 ft., 4. =Colorado.= _Weld Co._: Pawnee Buttes, 5300 ft., 1 (U. S. B. S.). _Logan Co._: Chimney Canyon, 10 mi. NE Avalo, 5100 ft., 5 (U. S. B. S.). _Museum of Natural History, University of Kansas, Lawrence. Transmitted January 15, 1951._ TABLE 1. MEASUREMENTS, IN MILLIMETERS, OF TWO SUBSPECIES OF THOMOMYS TALPOIDES. ______________________________________________________________________ Column A Catalogue number or number of averaged individuals Column B Sex Column C Total length Column D Length of tail Column E Basilar length Column F Length of hind foot Column G Zygomatic breadth Column H Least interorbital constriction Column I Mastoidal breadth Column J Length of nasals Column K Breadth of rostrum Column L Length of rostrum Column M Alveolar length if maxilliary tooth-row A | B | C | D | E | F | G | H | I | J | K | L | M _T. t. rostralis,_ from type locality 17092 |Male |220|56 |28 |33.2|23.7|6.4 |19.5|15.5|8.1 |17.5| 8.2 17095 |Male |228|68 |30 |33.3| - |6.5 |18.8|15.0|7.4 |17.3| 7.3 17091 |Male |212|56 |27 |33.0|22.8|6.5 |18.7|14.2|8.5 |16.2| 7.6 Average|Male |220|60 |28.3|33.2|23.2|6.5 |19.0|14.9|8.0 |17.0| 7.7 9 av. |Female|214|56 |27.1|31.6|22.4|6.5 |18.5|14.4|7.8 |16.8| 7.9 min. |Female|198|45 |25 |30.0|20.7|6.2 |17.7|13.2|7.4 |15.4| 7.1 max. |Female|230|72 |28.5|33.5|23.3|7.0 |19.8|14.9|8.1 |17.7| 8.4 _T. t. attenuatus,_ from type locality 15095 |Male |202|61 |26 |30.1|21.2|6.6 |18.2|13.6|7.3 |16.0| 7.0 15094 |Male |189|56 |24 |29.7|20.1|5.7 |17.2|12.4|7.2 |14.8| 6.9 from 2-1/2 mi. W Horse Creek P. O., 6600 ft. 15100 |Male |196|58 |27 |30.2|21.7|6.1 |18.4|14.5|7.5 |16.3| 7.0 3 av. |Male |196|58 |25.7|30.0|21.0|6.1 |17.9|13.5|7.3 |15.7| 7.0 from type locality 15096 |Female|203|59 |26 |30.0| - |6.1 |18.0|14.1|7.3 |16.3| 6.8 15098 |Female|192|69 |26 |28.8|19.8|5.5 |17.2|12.0|6.7 |14.7| 7.3 Horse Creek, 6500 ft. 15103 |Female|181|58 |25 |29.6|19.5|5.9 |16.3|13.0|6.9 |15.2| 7.0 3 mi. E Horse Creek P. O., 6400 ft. 15107 |Female|190|54 |27 |30.5|20.5|6.0 |17.9|13.5|7.3 |16.4| 6.8 15106 |Female|192|55 |26 |30.8|21.5|6.5 |18.2|12.7|7.6 |15.5| 7.0 5 av. |Female|192|59 |26 |29.9|20.3|6.0 |17.5|13.1|7.2 |15.6| 7.0