Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
JESimpson,
1938.
Thomomys umbrinus
2300ft., 1 mi. S. Moctezuma, Sonora.
May 26, 1938.
skull only.
♀444 jv. taken in wheat-field of river-bottom land—surrounding field cultivated to edge of lava hill.
May 27, 1938.
noskull; skull only.
♂451 taken in wheat-field as above.