Comparison of skulls of the specimens from Medano Ranch with skulls of topotypes and other individuals of aztecus of approximately equal age indicates that the coloradan specimens may average slightly smaller and have somewhat shorter rostra.
"Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions"
J. Knox Jones B. Mursaloglu
We have made explorations in many directions, and have found that through all the coloradan region people have succeeded in escaping to the heights.
"The Second Deluge"
Garrett P. Serviss