The particular site of attachment of the thoracic artery is of limited value as a taxonomic character.
"Thoracic and Coracoid Arteries In Two Families of Birds, Columbidae and Hirundinidae"
Marion Anne Jenkinson
Before presenting new evidence and a review of older evidence bearing on the problem, it seems desirable to review briefly in chronological order, the taxonomic history of the genera and subgenera of the chipmunks.
"Genera and Subgenera of Chipmunks"
John A. White
Our comments concerning the taxonomic status of these several names appear beyond.
"Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions"
J. Knox Jones B. Mursaloglu