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A Synopsis of the American Bats of the Genus Pipistrellus   By: (1902-1986)

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A Synopsis of the American Bats of the Genus Pipistrellus

BY

E. RAYMOND HALL and WALTER W. DALQUEST

University of Kansas Publications Museum of Natural History

Volume 1, No. 26, pp. 591 602, 1 figure in text January 20, 1950

University of Kansas LAWRENCE 1950

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, Edward H. Taylor, A. Byron Leonard, Robert W. Wilson

Volume 1, No. 26, pp. 591 602, 1 figure in text January 20, 1950

UNIVERSITY OF KANSAS Lawrence, Kansas

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1950

[Illustration: Union Label]

23 1546

A Synopsis of the American Bats of the Genus Pipistrellus

By

E. RAYMOND HALL AND WALTER W. DALQUEST

Four nominal species of the genus Pipistrellus are currently recognized in North America. They are Pipistrellus subflavus (F. Cuvier) of eastern North America, Pipistrellus hesperus (H. Allen) of western North America, Pipistrellus veracrucis (Ward) from Veracruz, Mexico, and Pipistrellus cinnamomeus Miller from Tabasco, Mexico.

In the past three years, specimens have been obtained in Veracruz (by Dalquest) of each of the southern species. One of these, P. cinnamomeus , previously was known from a single specimen; the other, P. veracrucis , was known only from six specimens which now are lost or misplaced. The results of our study of these recently acquired Mexican specimens constitute our principal contribution in this paper; we have done little more with the material from the United States and Canada than to codify the findings of other mammalogists with respect to the systematic status and geographic distribution.

Study of the available specimens reveals that there are only two species, Pipistrellus hesperus and Pipistrellus subflavus ; Pipistrellus veracrucis proves to be only a subspecies (geographic race) of P. subflavus , and Pipistrellus cinnamomeus proves to be a species of another genus, Myotis (see Hall and Dalquest, page 583 of this volume).

Genus Pipistrellus Kaup

1829. Pipistrellus Kaup, Skizzirte Entw. Gesch. u. natürl. Syst. europ. Thierw., Vol. 1, p. 98, Type, Vespertilio pipistrellus Schreber (not seen by us, after Miller, N. Amer. Fauna, 13:87, 1897).

Range in the New World. In North America from southern Canada to Honduras (47 degrees to 5 degrees North Latitude) and from the Atlantic to the Pacific; not recorded from the West Indies or South America.

Characters. Size small; tail approximately as long as outstretched leg; ears well developed with prominent tragus; dental formula: i.2/3; c.1/1; p.2/2; m.3/3; two upper incisors subequal and outer one lacking a concavity on surface facing canine; dentition otherwise essentially as in Myotis Kaup except that third premolar is always, instead of rarely, absent.

Remarks. There are two species in North America. Their geographic ranges, as now known, meet, but do not overlap. Certain differences between the two species are listed in the parallel columns below. Most of these differences in the skull and teeth are illustrated in figures 22 and 23 on page 92 of Miller's "Revision of the North American bats of the family Vespertilionidae (N. Amer. Fauna, 13, 1897)."

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