B 



Figure 9. — The lacrimal ridge protuberance of the 

 eastern red bat {Lasiurus borealis) (A) and the 

 Seminole bat [L. seminolus) (B). The dorsal surface 

 view of the upper left skull quadrant is depicted. 

 Note that the two triangular structures at the top are 

 the upper incisor and the upper canine. The hooked 

 structure at the lower left section is the anterior-most 

 section of the zygomatic arch. The lacrimal ridge 

 protuberance (lacrimal shelf) typically is larger in L. 

 borealis than in L. seminolus. 



10. a. Protuberance of the lacrimal ridge (shelf) well 

 developed (Fig. 9a) — eastern red bat [Lasiurus borealis) 



b. Protuberance of the lacrimal ridge poorly developed 

 or absent (Fig. 9b) — Seminole bat {Lasiurus seminolus) 



1 1 . a. Sagittal crest well developed; greatest length of skull 

 more than 16 mm — northern yellow bat {Lasiurus 

 intermedins) 



b. Sagittal crest absent or poorly developed; greatest 

 length of skull less than 16 mm — evening bat 

 {Nycticeius humeralis) 



Acknowledgments 



Support for this project was provided by the USDA 

 Forest Service, West Virginia University's Arlen G. and 

 Louise Stone Swiger Fellowship, and the National 

 Council of the Paper Industry for 7\ir and Stream 

 Improvement. Figures 1-8 were illustrated by B. Coslick; 



figure 9 was illustrated by G. Weis-Gresham. We thank 

 the numerous students at the University of Georgia who 

 tested earlier versions of the keys. Cover artwork by John 

 MacGregor. This project would not have been possible 

 without the professional support of B. R. Chapman and 

 the late J. Laerm. 



Literature Cited 



Anthony, E. L. P. 1988. Age determination in bats. In: 



Kunz, T. H., ed. Ecological and behavioral methods for 

 the study of bats. Washington, DC: Smithsonian 

 Institute Press. 533 p. 



Barbour, R. W; Davis, W. H. 1969. Bats of America. 

 Lexington, KY: University Press of Kentucky. 286 p. 



GoUey, F B. 1962. Mammals of Georgia. Athens, GA: 

 University of Georgia Press. 218 p. 



Floffmeister, D. F. 1989. Mammals of Illinois. Urbana, 

 IL: University of Illinois Press. 348 p. 



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