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The Baculum in the Chipmunks of Western North America
JOHN A. WHITE
University of Kansas Publications Museum of Natural History
Volume 5, No. 35, pp. 611-631, 19 figures in text December 1, 1953
University of Kansas LAWRENCE 1953
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY
Editors: E. Raymond Hall, Chairman, A. Byron Leonard, and Robert W. Wilson
Volume 5, No. 35, pp. 611-631, 19 figures in text
December 1, 1953
UNIVERSITY OF KANSAS Lawrence, Kansas
PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1953
24-8968
The Baculum in the Chipmunks of Western North America
JOHN A. WHITE
CONTENTS
PAGE
Introduction 613
Methods, Materials, and Acknowledgments 614
Variation 614
Key to the Bacula of the Species of Eutamias of Western North America 615
Accounts by Species 616 Eutamias alpinus 616 E. minimus 617 E. townsendii 618 E. sonomae 619 E. amoenus 619 E. dorsalis 620 E. merriami 621 E. quadrivittatus 621 E. ruficaudus 622 E. cinereicollis 624 E. quadrimaculatus 624 E. speciosus 625 E. panamintinus 625 E. umbrinus 626 E. palmeri 627 E. bulleri 627
Figures 1-19. Lateral views of bacula 629
Discussion 630
Literature Cited 631
INTRODUCTION
The baculum is the bony part of the penis. In the species of the subgenus Neotamias the proximal part of the baculum is termed the shaft, and the distal upturned part is termed the tip. On the dorsal side of the tip there is a longitudinal ridge termed the keel. The proximal end of the shaft is termed the base (see fig. 19). Depending on the species, the shaft varies from 2.11 to 5.28 mm. in length, and the base may or may not be widened or deepened.
The purpose of this report is to: (1) Show the usefulness of the structure of the baculum as a taxonomic character in chipmunks; and (2) compare a classification based on the structure of the baculum with a classification based on the structure and appearance of the skull and skin.
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