



Produced by Chris Curnow, Tom Cosmas, Joseph Cooper and
the Online Distributed Proofreading Team at
http://www.pgdp.net









                   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. natuerl. 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