EANA. 263 



region. Eight species are known to occur in Europe; 

 they may be distinguished by means of the following 

 synopsis : 



I. Vomerine teeth between the choanoe or extending 

 slightly beyond their posterior borders ; inter- 

 orbital space very narrow, measuring one-third 

 to one-half the width of the upper eyelid ; male 

 with external vocal sacs ; colour often green. 



B. esculenta. 

 II. Vomerine teeth behind the level of the choance ; 

 vocal sacs internal or absent; colour never 

 green. 



a. Tibio-tarsal articulation rarely reaching the 



tip of the snout and never beyond ; distance 

 between the dorso-lateral glandular folds 

 contained five to seven times in the length 

 from snout to vent; male with internal 

 vocal sacs. 



Inner metatarsal tubercle large, hard, com- 

 pressed, measuring one-halt to two-thirds 

 its distance from the tip of the inner toe ; 

 first finger extending beyond second ; tibia 

 shorter than the fore limb. B. arvalis. 



Inner metatarsal tubercle small, soft, oval; 

 first and second fingers equal, or first 

 extending slightly beyond second ; tibia as 

 long as or slightly shorter than the fore 

 limb B. camerani. 



Inner metatarsal tubercle small, soft, oval ; 

 first finger extending beyond second ; tibia 

 considerably shorter than the fore limb. 



B. temporaria. 



b. Tibio-tarsal articulation reaching the tip of 



the snout or beyond; tibia as long as or a little 

 shorter than the fore limb ; distance between 

 the dorso-lateral glandular folds contained 

 four to five and a half times in the length 

 from snout to vent; male without vocal sacs. 



