580 PROCEEDINGS OF THE NATIONAL MUSEl I/. vol.xxxv. 



exceptions to this rule, some of the bats with short summer fur being 

 the lightest in color of any of this species that I have seen. The 

 color of the underparts also varies considerably, but it always has a 

 yellowish or reddish tinge and is never tipped with pure white, as in 

 some specimens of M . subulatus. 



Average measurement of six females and four males: Total length, 

 89.4 mm: tail. 38.7; hind foot, 9.9; ear, 11.1; forearm, 37.4; tibia, 

 16.G. Cranial measurements of the same specimens: Greatest length 

 of skull. 15; basilar length, 11.5; palatilar length, 6.8; greatest width 

 of braincase, 7.8; depth of braincase from bullae, 0.9; maxillary 

 tooth row 7 , 6.9. 



MYOTIS VELIFER (J. A. Allen). 

 LARGE-WINGED BAT. 



This species, with a habitat chiefly along the Mexican boundary 

 region, had previously been reported from nowhere nearer than 

 southwestern Missouri and Xick-a-Jack Cave. Tennessee. A single 

 specimen was taken in the Twin Cave not far from the entrance on 

 August 9. It is a female, which apparently had nursed during the 

 present season, as there was a new 7 growth of short, whitish hairs 

 about the mamma'. There are also white hairs along the middle line 

 of the abdomen. Back light sepia, except some indistinct blotches 

 on the shoulders, which are t blackish. 



Measurements: Total length, 97 mm.; tail, 40; hind foot, 10; ear, 

 12; forearm, 44: tibia. 20. Cranial measurements: Greatest length, 

 10 nun.: basilar length, 13, palatilar length. 8; depth of braincase 

 over bullae, 7.5; width of braincase, 8.5; maxillary tooth row, 7. 



PIPISTRELLUS SUBFLAVUS (F. Cuvier). 

 GEORGIAN BAT. 



Next to Myotis lucifugus, this is the most abundant bat. It hiber- 

 nated in (he cave in considerable numbers and was seen Hying about 

 in the evenings throughout the summer. It is easily distinguished 

 from the other bats of the vicinity by its uncertain, wavering flight, 

 which resembles that of a butterfly. In the cave it was most often 

 found on the sides of the high walls at some distance from the 

 entrance. 



Average measurements of five adult males and five females are as 

 follows: Total length. 78.4 mm.; tail. 35.3; hind foot. 8.8; car. '.>.:>; 

 forearm. 33.8; Longest linger. 58.6. Cranial measurements, average 

 of five individuals: Greatest length of skull, 13.1 mm.; basilar 

 length, 10; palatilar length. 5.5; greatest width, 7.2; greatest depth, 

 0.4; maxillary tooth row, 5.0. 



