606 MR. G. A. BOULENGER ON THE [Nov. 17, 



intermediate between those of the two above-named species. In its 

 labial dentition it agrees with R. esculenta, the series of teeth being 

 usually |, sometimes | when a third very short series is present on 

 each side of the upper lip. The beak is whitish, narrowly edged 

 with black. Interocular space about once and a half the distance 

 between the nostrils, which equals or slightly exceeds the width of 

 the mouth. Tail pointed, rarely somewhat obtuse, once and two 

 thirds to twice the length of the body, its depth about one third its 

 length ; depth of the muscular part not quite half the greatest total 

 depth. Lines of muciferous crypts distinct on the head and body, 

 disposed as in R. agilis (see fig. 3, A, p. 598). 



Brown above, with metallic spots ; caudal crests greyish white, 

 with small brown spots and golden dots on the anterior half of the 

 upper crest ; sometimes a series of large brown spots on the upper 

 edge of the tail, or a linear series of small golden spots along the 

 upper and lower crests ; belly greyish with golden dots. 



The largest of the numerous specimens examined, for which I am 

 indebted to the kindness of Prof, G. Born, M. Heron Royer, and 

 Dr. Wolterstorff, measures 43 milUm. : body 16, width of body 10 ; 

 tail 27, depth of tail 9. 



This tadpole has been described by Born (Arch. f. mikr. Anat. 

 xxvii. 1886, p. 207), Heron Royer and Van Bambeke (/. c. p. 263, 

 pi. xviii.fig. 1), and Bedriaga (Bull. Soc. Nat. Mosc. 1889, p. 313), 

 but, with the exception of the mouth, has not yet been figured. 



R. arvalis is known to inhabit Germany, Holland near Apeldoorn, 

 Switzerland near Basle, Denmark, Sweden, Southern Norway, Russia, 

 Hungary, Transylvania \ Asia Minor, Western Siberia, the Kirghiz 

 Steppes, and North-western Persia. 



In Germany, R. arvalis breeds, as a rule, about a fortnight later 

 than R. temporaria, and its larvae transform between the middle of 

 June and the beginning of August. 



3. Rana temporaria, L. (Plate XLV. fig. 3.) 



Length of body once and a half to once and two thirds its width, 

 two thirds to one half the length of the tail. Nostrils equally 

 distant from the eyes and from the end of the snout or a little 

 nearer the latter. Eyes on the upper surface of the body, a little 

 nearer the end of the snout than to the spiraculum ; the distance 

 between the eyes about once and a half the distance between the 

 nostrils, and a little greater than the width of the mouth. Spiraculum 

 directed backwards and slightly upwards, nearly equally distant from 

 the end of the snout and from the anus, visible from above and from 

 below. Anus opening on the right side, close to the lower edge of 

 the subcaudal crest. Tail three to four times as long as deep, 

 ending in an obtuse point ; upper crest convex, not or but slightly 

 deeper than the lower, not extending far upon the back ; the depth 



^ I am able to add a new European locality to the habitat of this species ; 

 a breeding male obtained at Karlovac, Sclavonia, was presented this spring to 

 the British Museum by Hr. V. Fritsch. 



