NEW BATS FROM PANAMA — HANDLEY 473 



type, the only known specimen) ; dorsum bright rufous, darkening 

 almost to chestnut on interfemoral membrane; face noticeably more 

 red tinged than crown and nape; underparts bright red; membranes 

 black (this diagnosis is from notes that G. S. Miller, Jr., made at the 

 Berlin Museum in the early 1900's). 



Lasiurus seminolus Ilhoads: Type locality, Tarpon Springs, Pinellas 

 County, Florida, diagnosis: similar in size to borealis; dorsum ma- 

 hogany, washed with whitish; black basal band of dorsal hairs the 

 dominant band; face black; ears and membranes with reddish mark- 

 ings; females larger than males, but similar in coloration; juveniles 

 darker; lachrymal ridge not developed, specimens examined: many 

 from southeastern United States. 



It should be noted that previous authors have followed Peters (1871) 

 in aligning egregius with the genus Dasypterus, because it lacked the 

 minute upper premolar (P 1 ), although in other characters it agreed 

 with the borealis group of the genus Lasiurus. Absence of P 1 in a 

 single specimen of Lasiurus {egregius apparently is still known only 

 by the type specimen) is not significant, for although P 1 seems always 

 to be absent in Dasypterus, it is also absent in one or both maxillae 

 of about 10 percent of Lasiurus. Table 3, on page 475, lists some 

 of the conspicuous differences between the species of Lasiurus and 

 Dasypterus. More impressive are the following similarities linking 

 these nominal genera and distinguishing them from other vesperti- 

 lionids and in some cases from all other bats : 



Four mammae and average of two or three young per litter. 



Spiral effect in scale arrangement on hairs. 



Reduction of sebaceous glandular tissue and location of the submaxillary 



salivary gland in the facial area. 

 Bright coloration. 



Baculum short, J-shaped, with high base and narrow shaft. 

 Distally enlarged and spiny penis. 

 Furry interfemoral membrane. 



It seems more reasonable to stress the important similarities of 

 these bats and regard them as congeneric, rather than to stress the 

 insignificant differences and regard them as representing distinct gen- 

 era. I do not believe that Dasypterus is useful even as a subgenus. 



Recent bats of the ega group may be arranged in the genus Lasiurus 

 as follows: 



Lasiurus ega argentinus Thomas: Type locality, Goya, Corrientes, 

 Argentina (caudatus Tomes, Pernambuco, Brazil, is a synonym). 

 diagnosis: dorsum pale whitish buff, washed lightly with black; 

 orange hairs of interfemoral membrane contrasting with remainder of 

 dorsum; face blackish; underparts dull whitish buff. Paler than 

 ega. Body size small, specimens examined: Argentina: Tucuman, 

 1, CNHM, 1, USNM. Bolivia: Caiza, 1, USNM. Brazil: Ipiranga, 



