168 CHIHOPTEKA 



KEY TO THE EUBOPEAN SPECIES OP MYOTIS. 



Size large (forearm 53 to 64 mm., oondylobasal 

 length of skull 18 • 6 to 23 ■ 6 mm., upper tooth- 

 row 8 • 2 to 10 • 6 mm.) ; middle upper premolar 

 normally crowded inward from axis of tooth- 

 row; third lower molar with second triangle 

 much smaller than first and noticeably different 

 from it in form. 

 Oondylobasal length of skull 22 to 23 '6 mm.; 

 mandible 17 '8 to 19 mm. ; maxillary tooth- 

 row 9-8 to 10"6 mm. (Central and southern 



Europe) M. myotis, p. 192. 



Oondylobasal length of skull 18 • 6 to 21-4 mm. ; 

 mandible 15 • 2 to 17 ■ 2 mm. ; maxillary tooth - 



row 8-2 to 9'4 mm. (Mediterranean region) M. oxygnathus, p. 199. 

 Size small or medium (forearm 34 to 47 mm., oondy- 

 lobasal length of skull 12 ■ 4 to 16 ■ 8 mm. , upper 

 tooth -row 5 to 7 mm.) ; middle upper premolar 

 not crowded inward from axis of tooth-row ; 

 third lower molar with second triangle nearly 

 as large as first and essentially like it in 

 form. 

 Foot relatively large, obviously more than half 

 as long as tibia ; calcar about twice as long 

 as free border of interfemoral membrane ; 

 skull broad, the width of brain-oase more 

 than half greatest length; crown area of 

 molars relatively small ; upper molars with 

 evident protoconule. 

 Forearm about 47 mm. ; oondylobasal length 

 of skull about 16 mm. (Central and 



southern Europe) M. dasycneme, p. 189. 



Forearm less than 45 mm. ; oondylobasal length 

 of skull never more than 15 mm. 

 Tibia and adjacent membrane densely furred; 

 forearm about 42 mm. ; oondylobasal 

 length of skull 14-0 to 14-8 mm. (Medi- 

 terranean region) 71/. capaccinii, p. 187. 



Tibia and adjacent membrane not furred ; 

 forearm about 35 mm. ; oondylobasal 

 length of skull 13-2 to 13 -8 mm. 



(Distribution general) M. daubentonii, p. 184. 



Foot relatively small, about half as long as tibia ; 

 calcar about as long as free border of inter- 

 femoral membrane ; skull narrow, the width 

 of brain-case less than half greatest length ; 

 crown area of molars relatively large ; upper 

 molars without protoconule. 

 Ear not specially elongated, extending slightly 

 beyond nostril when laid forward. 

 Forearm about 40 mm. ; oondylobasal length 

 of skull about 15 mm. ; posterior border 

 of ear conch with deep, almost angular 



emargination slightly above middle M. emarginatus, p. 177. 



Forearm about 34 mm. ; oondylobasal length 

 of skull 12-6 to 13 • 2 mm.; posterior 

 border of ear conch with shallow, in- 

 conspicuous emargination M. mystacinus, p. 169. 



Ear elongated, extending conspicuously beyond 

 nostril when laid forward. 



