HOWELL — SEVEN NEW CHIPMUNKS 
183 
available for study has vastly increased’^ and the number of recognized 
forms has more than doubled; our knowledge of the distribution of 
the various species has of course likewise extended, but in the absence 
of a monograph of the group, the relationships of the species are not 
well understood and many forms in current nomenclature are wrongly 
assigned. 
Much of this confusion is due to the erroneous identification by the 
earlier revisers of Eutamias quadrivittatus (the first member of the genus 
to be named) and their failure to recognize the distinction between 
the races of Eutamias amcenus and of E. minimus — two distinct species 
whose ranges overlap in several regions, and certain forms of which 
greatly resemble one another. Doctor Merriam, in 1905, showed 
conclusively that the name quadrivittatus applies to the larger of the 
two species occurring together in the mountains of Colorado and in 
the same paper named the smaller form (then currently confused with 
quadrivittatus) E. amoenus operarius.^ He did not, however, attempt a 
revision of these two groups, and a more detailed study of the relation- 
ships of operarius shows it to be a subspecies of Eutamias minimus 
rather than of E. amcenus, 
LIST OF RECOGNIZED AMERICAN FORMS OF EUTAMIAS, WITH SYNONYMS^ 
Eutamias alpinus^® 
EUTAMIAS MINIMUS GROUP 
Eutamias minimus minimus (Bachman) 
Eutamias minimus pictus (Allen) 
Tamias minimus melanurus Merriam 
Eutamias minimus caryi Merriam 
Eutamias minimus pallidus (Allen) 
Eutamias minimus cacodemus Cary 
Eutamias minimus consobrinus (Allen) 
Eutamias lectus Allen 
Eutamias consobrinus clarus Bailey 
Eutamias minimus operarius Merriam 
Eutamias minimus atristriatus Bailey 
Eutamias minimus arizonensis, nobis 
Eutamias minimus oreocetes Merriam 
Eutamias minimus borealis (Allen) 
7 Dr. Allen based his review on about 650 specimens, while the present writer 
has examined more than 10,000. 
8 Merriam, C. Hart, Proc. Biol. Soc. Washington, vol. 18, pp. 163-164, 1905. 
® Synonyms in italics. 
This species apparently is not closely related to any other. 
