A New Species of Heteromyid Rodent from the Middle Oligocene ofNortheast Colorado with Remarks on the Skull
BY
EDWIN C. GALBREATH
University of Kansas Publications
Museum of Natural History
Volume 1, No. 18, pp. 285-300, 2 plates
August 16, 1948
University of Kansas
LAWRENCE
1948
University of Kansas Publications, Museum of Natural History
Editors: E. Raymond Hall, Chairman; H. H. Lane, Edward H. Taylor
Volume 1, No. 18, pp. 285-300, 2 plates
August 16, 1948
University of Kansas
Lawrence, Kansas
PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1948
22-3342
Plate 2. Heliscomys tenuiceps. Univ. Kans. Mus. Nat.Hist., Vert. Paleo. Coll. No. 7702. A, dorsal view; B, lateral view; C,ventral view. All views approximately × 5.
Plate 3. Heliscomys tenuiceps. Univ. Kans. Mus. Nat.Hist., Vert. Paleo. Coll. No. 7702. A, lateral view of right side ofskull showing structures in orbital area. ALS, alisphenoid. FR, frontal.MAX, maxillary. OS, orbitosphenoid. PAL, palatine. PC, presphenoidcanal. SF, sphenoidal fissure. SFr, sphenofrontal foramen. SPal,sphenopalatine foramen. Approximately × 9.3; B, occlusal view of P4-M3.Approximately × 23.4.New Species of Heteromyid Rodent from the Middle Oligocene ofNortheast Colorado with Remarks on the Skull
By
EDWIN C. GALBREATH
Heretofore our knowledge of the osteology of Heliscomys Cope has beenextremely limited; this genus previously was known by its teeth,fragmental maxillaries, incomplete palatine bone and mandible, and partof one forelimb. In the summer of 1946 the writer, as a member of theUniversity of Kansas Museum of Natural History field party, discoveredthe anterior part of a skull of Heliscomys in the middle Oligocenedeposits of Logan County, Colorado. This specimen, representing a newspecies, yields a welcome, and greatly desired addition to our fund ofinformation about the genus.
The writer is indebted to Dr. Robert W. Wilson for advice and helpfulcriticism in the course of this study, and to Mr. Bryan Patterson of theChicago Natural History Museum for the loan of comparative material.Mrs. Bernita Mansfield of the Geology Department, University of Kansas,prepared the plates.
Family HETEROMYIDAE
Heliscomys tenuiceps, new species
Holotype.—Anterior part of a skull with left P4-M3, N