les the blackish Colombian population
than the paler populations to the north and the name _panamensis_,
therefore, is correctly applicable to the bat from Panama, but not to
bats of the species _Lasiurus ega_ from farther north as most authors
(see, for example, Hall and Kelson, 1959:194, map 143; and Handley,
1960:474) suggested was the case. For the populations north of Panama
the name _Lasiurus ega xanthinus_ (Thomas) (1897:544) needs to be used.

Lasiurus ega xanthinus (Thomas)

1897. _Dasypterus ega xanthinus_ Thomas, Ann. Mag. Nat. Hist.,
ser. 6, 20:544, December, type from Sierra Laguna, Baja California.

1953. _Lasiurus ega xanthinus_, Dalquest, Louisiana State
Univ. Studies, Biol. Ser., 1:61, December 28.

_Geographic distribution._--Southern California, southern
Arizona, and northern Coahuila southward through Mexico to southern
Costa Rica.

_Diagnosis._--Yellowish-brown with an overlay of grayish
anterior to the shoulders; forearm, 42.7-47.2.

_Remarks._--Specimens from Baja California and the adjacent
western part of the mainland of Mexico average paler than specimens
from Veracruz and some places in Central America but the
differences are slight.

_Records of occurrence._--Specimens examined, 21, as follows:
BAJA CALIFORNIA.--Comondu, 1 (USNM); Sierra Laguna, 4 (1
USNM, 3 British Mus.). COAHUILA.--4 mi. W Hacienda La
Mariposa, 2300 ft., 2 (KU). ZACATECAS.--Concepcion del
Oro, 7680 ft., 4 (KU). TAMAULIPAS.--Sierra de Tamaulipas,
1200 ft., 10 mi. W, 2 mi. S Piedra, 5 (KU); 16 mi. W, 3 mi. S
Piedra, 1 (KU). SINALOA.--1 mi. S Pericos, 1 (KU).
VERACRUZ.--Achotal, 1 (Chicago Mus.).
YUCATAN.--Yaxcach, 1 (USNM). COSTA RICA.--Lajas,
Villa Quesada, 1 (AMNH); San Jose, 1 (AMNH).

_Additional records:_ CALIFORNIA: Palm Springs
(Constantine, 1946:107). ARIZONA: Tucson (Cockrum,
1961:97). BAJA CALIFORNIA (Handley, 1960:474): Santa Ana;
Miraflores. SINALOA: Escuinapa (Handley, 1960:475).
DURANGO: Aguajequiroz, 12 mi. SSW Mapimi, 5000 ft. (Greer,
1960:511). SAN LUIS POTOSI (Dalquest, 1953:62): 1-1/2 mi.
E Rio Verde; 19 km. SW Ebano; 4 mi. SSW Ajinche. QUINTANA
ROO: 7 mi. N, 37 mi. E Puerto de Morelos (Ingles, 1959:384).
HONDURAS: Tegucigalpa (Handley, 1960:474).

Lasiurus ega panamensis (Thomas)

1901. _Dasypterus ega panamensis_ Thomas, Ann. Mag. Nat. Hist.,
ser. 7, 8: