550 MB. G. A. BOtJLBNGEIl ON LITTLB-KNOWN [May 5, 



EaNA OAMEEANl. (Plate XXI. fig. 1.) 



Eicna camerani, Bouleng. Bull. Soc. Zool. Prance, 1886, p. 597 ; 

 Boettg. Ber. Senck. Ges. 1892, p. 134. 



First described from four specimens collected by Dr. Oscar 

 Schneider on Lake Tabizhuri, 8000 feet, and at Achalkalki, and 

 preserved in the Berlin Museum, this species has been rediscovered 

 in the Karabagh Mouutains, around Lake Gokcha, and near Tiflis, 

 where it occurs together with B. macrocnemis. Thanks to the 

 kindness of Professor Boettger, the British Museum has received 

 three specimens — one male from GiUi, L. Gokcha, and two young 

 from the C. Karabagh — in exchange from the Sonckenberg Museum. 

 Their detailed measurements are recorded below. 



11. camerani is very closely allied to R. macrocnemis, and more 

 material is required before thoy can positively be pronounced to be 

 distinct species. The affinity to 11. avvalis is also very great, but 

 the small size of the inner metatarsal tubercle in R. camerani is 

 sufflcieut for distinction. 



The vomerine teeth do not differ from those of R. macrocnemis. 

 The snout is more pointed and more prominent, as in a typical 

 R. arvalis ; the interorbital space is very narrow, one half to two 

 thirds the width of the upper eyelid, and considerably narrower 

 than the distance between the nostrils ; the tympanum measures 

 hardly half the diameter of the eye, from which it is separated by 

 a distance equal to at least two thirds its diameter. The first and 

 second fingers are equal, or the first extends very slightly beyond 

 the second ; the subarticular tubercles are strong, and the inner 

 metatarsal tubercle is oval, measuring two fifths to one half its 

 distance fi-om the end of the inner toe ; the web between the toes 

 is as much developed as in R. macrocnemis ; the male in breeding 

 attire is, however, still unknown. The tibio-tarsal articulation 

 reaches the eye or the nostril ; the length of the hind limb between 

 the vent and the tibio-tarsal articulation equals the length of head 

 and body minus the whole or half the length of the snout ; the 

 tibia is as long as the foot or the fore limb. The glandular lateral 

 folds are strong and very prominent ; the distance between them, 

 on the scapular region, equals two ninths to one fifth the length 

 from snout to vent. 



The coloration is in every respect that of R. arvalis, and 

 handsomely striped specimens are also of frequent occurrence ; the 

 light moustache is strongly marked, extending from the tip of the 

 snout to the shoulder. 



6. Tg. Tg. 



millim. millim. millim. 



Prom snout to vent 45 .34 32 



Length of head 15 11 10-5 



"Width of head 16 11-5 11 



Diameter of eye 5 .3-5 35 



Interorbital width 2-5.2 2 



Prom eye to nostril .... 3 2 2 



