478 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



total of 47, including the type, from Florida, Georgia, Mississippi, 

 and Louisiana. 



Lasiurus intermedins H. Allen: Type locality, Matamoros, Tamau- 

 lipas, Mexico, diagnosis: dorsum clear yellowish orange with very 

 fine blackish wash (brighter, clearer orange than panamensis, with 

 which it is sympatric) ; hairs of interfemoral membrane not contrasting 

 with remainder of dorsum; face slightly blackened; underparts colored 

 like dorsum. Body size large, specimens examined: Cuba: San 

 German, Oriente Province, 1, USNM. Honduras: Rio Yeguare, 

 between Tegucigalpa and Danli, 1, MCZ. Mexico: San Bartolome, 

 Chiapas, 1, USNM; Tehuantepec, Oaxaca, 1, AMNH; Izamal, Yuca- 

 tan, 5, USNM; Tekom, Yucatan, 1, CNHM; Matamoros, Tamaulipas, 

 5, USNM. United States: Brownsville, Texas, 4, AMNH, 1, ANSP, 

 3, CNHM, 49, USNM; Cameron County, Texas, 6, USNM; Padre 

 Island, Texas, 1, USNM. 



Although geographic variation in coloration is considerable, geo- 

 graphic variation in body size is not apparent in the small samples 

 of ega that I have examined (see table 4, pp. 476-477). 



L. intermedins and floridanus must be closely related. Together 

 they stand well apart from ega in larger body size, more massive skull, 

 stronger rostrum, higher crests, and more widely spreading zygomata. 

 Southern Texas and Latin American populations of intermedins average 

 larger in body size than do specimens of floridanus from Louisiana, 

 Georgia, and Florida, but they overlap. Neither this variation nor the 

 variation in coloration appears to be clinal in intermedins and flori- 

 danus. However, similarity of the antorbital structure in specimens 

 from Mexico, Texas, and Louisiana, in contrast to this structure in 

 specimens from Georgia and Florida, suggests gene flow between 

 intermedins and floridanus. I have not seen specimens from Texas 

 north of the Rio Grande Valley, where intergradation would be 

 expected to occur if floridanus and intermedins are conspecific. 



