134 



BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



It is true that in distorted or badly preserved specimens the keel may 

 not always be evident, and the color of the fur is not to be made out 

 in bleached alcoholic material; but the smaller foot is usually suffi- 

 cient to separate Myotis soctalis from M. lucifugus^ and the skull, 

 in its smaller size, more slender form and slight median crest, is 

 likewise sufficiently diagnostic. 



It is a curious fact that although this bat occurs over much of 

 the eastern United States, nearly all the known individuals were 

 taken during hibernation. A series was secured in a cave at Proctor, 

 Vt., in early April, where a few Myotis lucifugus were found at 

 the same time. A great number annually winter in the Wyandotte 

 Cave, Ind. Two or three lots of bats from this station include this 

 species only. Where these bats go with the coming of spring and in 

 what way their habits differ from those of Myotis lucifugus it is 

 impossible to say. Yet it seems probable that some difference in 

 habits exists, for Myotis sodalis has not been captured as M. lucifugus 

 so often is, either in small colonies in buildings or as single individuals 

 shot while flying about the edges of ponds and along streams. 



External measurements of Myotis sodalis 



Locality 



Vermont: 



Proctor 



Do - 



Do... 



Do- 



Do 



Do 



Do 



Do 



Do 



Do 



Pennsylvania: 



Center County 



Do 



Do. 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Indiana: 



Bicknell 



Wheatland 



Do. 



Do 



Wyandotte Cave 



Do. 



Do 



'Do 



Kentucky: 



Mammoth Cave 



Do 



Do 



Do 



Do 



Do.. 



Do 



Do-._ 



Do... 



Do 



•Type. 



46.4 

 46.4 

 46.6 

 45.0 

 45.8 

 45.6 

 45.2 

 49.0 

 45.6 



35.8 

 37.0 

 35.0 

 38.8 

 37.8 

 41.0 

 39.0 

 36.0 

 36.0 



43.8 34.2 



45.0 

 43.8 

 43.0 

 48.2 

 46.4 

 42.2 

 45.0 

 45.4 

 41.4 

 46.6 



44.8 

 44.8 

 49.0 

 47.0 

 47.2 

 47.6 

 46.0 



82479 

 82531 

 82536 

 82545 

 82584 

 82608 

 82612 

 82629 

 82644 



49.0 



49.0 

 45.2 

 45.4 

 46.0 

 46.8 

 48.0 

 49.8 

 45.6 

 49.0 



32.0 



27.0 



39.2 



32.6 



32.0 



36. Ol 



35.0! 



36.0 



31.0 15.2 



38.8 16.8 



36.4 

 38.0 

 38.8 

 35.4 

 39.0 

 37.8 

 37.4 



40.8 

 41.6 

 37.0 

 35.6 

 38.4 

 3.5.0 

 43.8 

 37.6 

 36.0 

 38.0 



15.0 

 15.2 

 14.6 

 15.6 

 15.0 

 15.0 

 14.6 

 16.2 

 15.6 

 15.0 



15.0 

 16.8 

 15.6 

 15.2 

 16.0 

 15.0 

 14.8 

 15.8 



15.8 

 16.2 

 16.0 

 16.8 

 16.4 

 15.8 

 15.2 

 15.4 



7.4 

 7.8 

 7.8 

 7.8 

 8.0 

 8.0 

 7.0 

 8.0 

 7.8 

 7.21 



7.4I 

 8.0, 

 7.8' 

 7.0 

 7.8 

 8.0 

 7.0 

 7.6 

 7.8 

 8.6 



37.4 

 40.0 

 36.0 

 38.0 

 39.0 

 39.0 

 36.2 

 40.0 

 39.0 

 39.0 



38.0 

 40.0 

 39.4 

 37.4 

 38.2 

 38.0 

 38.8 

 38.0 

 38.4 

 40.2 



8.0 39.0 



15.0 8.2 



15.8, 8.6 



14. 8| 7.6 



15.4! 8.0 



1.5. 4 j 8.0 



15.0 8.2 



17.0 8.6 



16.2 8.0 



15.8 8.2 



16.6 8.0 



39.0 



40.0 



39.2 



37.6 



39 



40.0 



39.4 



39.4 



40.6 

 39.0 

 38.2 

 38.4 

 37.6 

 40.4 

 39. S 

 37.2 

 39.8 



34.0 

 35.4 

 33.0 

 34.4 

 33.6 

 35.6 

 34.0 

 35.4 

 36.0 

 35.4 



34.8 



34, 



35.8 



34.2 



34.2 



34.4 



35.0 



34.6 



35.4 



36.0 



36 



36.0 



37.0 



35.6 



33.0 



36.4 



36.0 



37.0 



36.4 

 37.0 

 35.6 

 34.8 

 36.2 

 36.6 

 38.0 

 35.8 

 34.0 

 36.4 





32.4 

 33.0 

 31.0 

 32.0 

 32.0 

 33.2 

 32.0 

 33.6 

 34.0 

 33.6 



33.0 

 33.0 

 34.8 

 32.4 

 32.4 

 32.0 

 32.6 

 31.6 

 34.0 

 33.8 



12.4 

 13.4 

 13.0 

 12.8 

 12.8 

 12.0 



34.2 14.8 

 33. 2i 14.0 

 34.2, 14.0 

 34.0 14.4 



10.2 

 11.8 

 11.8 

 11.0 

 11.4 

 12.0 



9.0 

 9.0 

 9.0 

 9.0 

 8.8 

 9.0 

 8.6 

 9.4 



8.4 

 8.2 

 9.0 



8.0 

 9.0 

 9.0 

 8.8 

 8.8 



13.01 9.2 



11.6' 8.8 



10. 8i 9.2 



11.0 9.0 



31.41 13.2 11.6 9.4 



14.2 12.4 9.0 



13.8 11.0 9.0 



34.2 

 33.6 

 34.2 



33.6 

 35.0 

 3.3.0 

 33.0 

 34.0 

 33.4 

 35.4 

 33.2 

 32.4 

 34.0 



13.6 



14.2 

 13.2 

 14.4 

 13.4 

 13.4 

 13.6 

 10.4 

 13.2 

 13.6 



12.4 

 11.2; 



11.4 

 13.0 

 11.2 

 11.0 

 11.0 

 8.8 

 11.2 

 12.0 



9.2 

 9.0 

 9.0 

 9.2 



9.4 

 9.0 



8.4 

 9.0 



