TWO VARIETIES OF RANA ARVALIS. 
179 
by de Bedriaga under the name of «Rana temporaria var. asiatica ». — 
Both shall be characterized and briefly described at this place. 
My work was greatly facilitated by the kindness of my esteemed friend, 
Dr. W. Wolterstorff, Curator at the Magdeburg Museum, to whose 
amiability I owe, for comparison’s sake, a series of typical R arvalis f origi¬ 
nating from the neighbourhoods of Magdeburg, collected by his disciple, 
Mr. F. Molle. Expressing my very best thanks to Mr. Wolterstorff for 
his obliging endeavours, I dedicate to him the new European variety, 
distinguishing it from the typical (Northern) Rana arvalis Nilss. under 
the name of : 
Eana arvalis Nilss. var. Wolterstorffi n. v. 1 
Rana agilis (non Thom.), Wolterstorff, Jahrb. Nat. Ver. Magdeburg 
1890, p. 316. 
Rana arvalis (non Nilss.), Méhely, Magyarorsz. barna békái (Ranæ fuscæ 
Hungariæ), M. Tud. Akad. Math. Természettud. Közi., XXV, Budapest, 1892, 
p. 29, táb. II & IV; Werner, (partim?) Rept. u. Amph. österr. Ung. u. d. Occu¬ 
pations!., Wien, 1897, p. 90, Taf. Ill, Fig. 8, 8a, 8&; Boulenger, partim, op. cit„ 
p. 288. 
Considerably la r g e r than Rana arvalis Nilss. s. str., habit slen¬ 
der, resembling in both respects Rana agilis Thom.; tibia considerably 
long, generally at least as long as, or longer than fore limb, 
tibio tarsal articulation in ÇÇ reaching the nostril or at least between it 
and anterior corner of eye, in (J<J reaching or exceeding the tip of snout ; 
heels considerably overlapping, when limbs are folded at right angles to 
axis of body ; outer metatarsal tubercle sometimes indicated by a light 
spot ; inner metatarsal tubercle contained 8%—9% times in length of tibia 
in $?, 9^4—12 times in the (J. Coloration very variable, striped or not, 
agreeing in this respect with the typical form; in some specimens from 
the Lake Balaton (shores of Badacsony, County of Zala) I found instead 
of stripes densely disposed roundish spots in a like manner as sometimes 
observable in R. fusca Bös. 2 Belly in the average unspotted or but scar¬ 
cely spotted on gular and pectoral region. 
In view of clearly defining the characters of the two forms of 
Rana arvalis , not distinguished until now, I add in the following to 
the above diagnosis a dihotomic table illustrative of the main diffe¬ 
rences between them: 
- • i -.7 . . 7‘.• . ; ..- - i• •• • . ,7 - * 
1 Only the most important synonymes are referred to. 
2 Compare with Boulenger, op. cit. Pl. XXI, Fig. 1. — This pattern may be 
sometimes observable in the typical form also. 
12 * 
