278 EANIDJl. 



between the latter and the typical form appears to 

 me arbitrary, and that my arrangement is open to this 

 criticism, that there is altogether a greater amount of 

 difference between the two extremes of the series than 

 there is between the extreme in the lessonse direction 

 and the form lessonse itself. The true typical B. escu- 

 lenta, as figured by Rosel, is pretty well in the middle 

 of the series ; the outermost specimens with small 

 inner metatarsal tubercle are from France, Corsica, 

 and Italy; whilst the opposite obtains in specimens 

 from Basle and Vienna. 



Var. lessons. 



Inner metatarsal tubercle very strong, compressed, 

 hard, crescentic, its depth about half its length, which 

 is 1-j to 2 times in the length of the inner toe, and 

 •5 to 8 times in the length of the tibia ; when the 

 limbs are folded at right angles to the body the heels 

 sometimes meet, but usually fail to meet ; tibia con- 

 siderably shorter than the foot measured from the 

 outer metatarsal tubercle. The tibio-tarsal articula- 

 tion reaches between the shoulder and the eye. Skin 

 smooth or with small warts ; glandular lateral fold 

 very prominent, narrower than the upper eyelid. 



Bright green or brown above, the black markings 

 sometimes forming longitudinal bands ; hinder side of 

 thighs handsomely marbled with black on a bright 

 yellow or orange ground; vocal sacs not, or but very 

 slightly pigmented. 



British specimens are olive-brown or bronzy-brown 

 above, spotted with black, strongly marbled on the 

 flanks, where a lio-ht longitudinal area remains un- 

 spotted; glandular folds lighter; the sides of the 

 head and the ground colour of the flanks sometimes 

 green; canthal streak well marked, black; upper lip 

 usually bordered with black ; tympanum chestnut- 

 brown ; a pale yellow or pale green vertebral line, 

 frequently edged with black. The dark cross-bands 

 on the limbs usually very irregular, sometimes absent. 



