143 



7. PipistreUus suhfturus (F. Cuvier). Georgian bat. 



Partial sluills and mandibles representing eight individuals of this 

 species were found at various points in or near the "big room." 



8. LasiKrus cineien.'^ (Beauvois). Hoarj' bat. 



This species is widely distributed, but everywhere rare. The find- 

 ing of two partial skulls and skeletons adds this locality to the 

 two previously recorded for Indiana. 



9. Lasiurits boiealis (Miiller). Red bat. 



Remains of this species were far more abundant than of any other. 

 More or less complete skulls and skeletons of 203 individuals 

 were found. I'he abundance of the species will be discussed 

 later. 



10. Myoiis suhulotus iSay). Say bat. 



One skull can be unquestionably rel'erred to this species. 



11. Mijotis liicifut/tts (Le Conte). Little brown bat. 



Nine skulls could be positively referred to this species. Eight 

 others vsere probably M. Incifugus, but were too badly broken 

 to determine with certainty whether they belonged to this or 

 to the last precediiig species. 

 It will be noted that the above list contains a large number (203) of 

 specimens of the red bat and but few (17) of the little brown bat. If we 

 turn to the living representatives of the two species this abundance is ex- 

 actly reversed. Mr. W. S. Blatchley informs me that the proportion of the 

 two species in Wyandotte Cave is about 1 to 1,000, the larger number being 

 the brown. Mr. A. M. Banta, who has had a very extensive acquaintance 

 with the cave fauna of Monroe and Lawrence counties, is of the opinion that 

 the red bat never enters caves at all, and that, though common above 

 ground, it is less abundant than the brown species. My own observations 

 are in complete accord with those of Mr. Banta. 



The period at which this change in relative abundance has taken place 

 can not be determined accurately from the evidence now at hand. Evident- 

 ly it has been within rec-ent geological times, since many of the bones were 

 found in places where they would have been destroyed by changes which 

 must have taken place during some recent epoch. On the other hand 

 many of them were found partially covered with fragments of stone which 

 have gradually weathered siwny from the larger masses, and this would 

 seem to indicate that at least a part of the bones are many years, possibly 



