Bulletin of the Museum of Comparative Zoology AT HARVAED COLLEGE Vol. 127, No. 6 A STUDY OF ECHMATEMYS CALLOPYGE FROM THE UINTA EOCENE OF UTAH, AND ITS REDEFINITION AS A SUBSPECIES OF E. SEPTARIA By David C. Roberts With Two Plates CAMBRIDGE, MASS., U.S.A. printed for the museum August, 1962