an wide instead of _vice versa_. The
differences in the sternum and proportions of the forelimb reflect the
more rapid flight of the hoary bat. The yellow bats differ from the red
bats and hoary bat in long rostrum, pronounced sagittal crest, high
coronoid process, absence of the first upper premolar, long first
phalanx of the third digit and short terminal (3rd) phalanx of the same
digit. Features in which the red bats are extreme in the genus are
short rostrum, short forearm, and relatively longer second phalanx of
the third finger. The red bats differ only slightly one from another.

Next to nothing is known of extinct Tertiary ancestors of species of
the genus _Lasiurus_. Also relatively little is known about _Lasiurus_
in the Pleistocene. Consequently, evolution of the living species has
to be inferred almost entirely from what is known about their
structure, habits, and geographic distribution. Figure 4 presents some
ideas concerning relationships.

[Illustration: FIG. 4. Postulated relationships of species of the genus
_Lasiurus_.]

LIST OF NAMED KINDS OF THE GENUS LASIURUS

The words "type from" indicate that a specimen or specimens served as
basis for the name. The words "type locality" signify lack of knowledge
as to whether a specimen was preserved.

Red Bats

_Lasiurus borealis borealis_ (Mueller), 1776, type from New York.

[_Vespertilio_] _noveboracensis_ Erxleben, 1777, based, in part,
on "Der Neujorker" of Mueller (_ante_).

_Vespertilio lasiurus_ Schreber, 1781, type locality, North
America.

_Vespertilio rubellus_ Palisot de Beauvois, 1796, type locality
unknown.

_Vespertilio rubra_ Ord, 1815, based on the red bat of Wilson,
Amer. Ornith., 6:60.

_Vespertilio tesselatus_ Rafinesque, 1818, type locality unknown.

_Vespertilio monachus_ Rafinesque, 1818, type locality unknown.

_Vespertilio rufus_ Warden, 1820, based on the red bat of Wilson,
_ibid._

_Lasiurus funebris_ Fitzinger, 1870, type locality, Tennessee.

_Myotis quebecensis_ Yourans, 1930, type from Anse-a-Wolfe,
Quebec.

_Lasiurus borealis frantzii_ (Peters), 1871, type from Costa Rica.

_Lasiurus borealis teliotis_ (H. Allen), 1891, type probably from
California.

_Lasiurus borealis ornatus_ Hall, 1951, type from Penuela,
Veracruz.

_Lasiurus borealis varius_ (Poeppig), 1835, type from Antuco,
Provincia de Bio-Bio, Chile.

_Nycticeus