508 On a new Snake from Arabia. 



Daijeellng ; four specimens. 



This species is intermediate between R. latopalmataj Blgr. 

 { = R. aj-ghana, Gthr.), and R. formosa^ Gthr. It is to the 

 latter species that I referred the first two specimens which came 

 under my notice (Cat. Batr. Ecaud. p. 70, R. formosa, specs. 

 c-d). With more material before me, which I owe to the 

 kindness of Mr. W. T. Blanford, I have now no hesitation in 

 establishing the above new species. The four closely allied 

 forms which occur together at Darjeeling may be easily 

 distinguished by means of the following synopsis : — 



A. Third finger not longer than the distance be- 



tween the nostril and the tympanum. 



a. First finger extending a little beyond second ; 



tympanum about half the diameter of the 



eye -R. livida, Blyth. 



b. First finger not extending quite as far as 



second ; tympanum not half the diameter 



of the eye -K. latopahnata, Blgr. 



B. Third finger at least as long as the distance be- 



tween the tip of the snout and the tympanum j 

 first finger much shorter than second. 



a. Tibio-tarsal articulation reaching beyond the 



tip of the snout ; tibia as long as the trunk R. himalayana, Blgr. 



b. Tibio-tarsal articulation reaching the tip of the 



snout; tibia considerably shorter than the 



trunk It, formosa, Gthr. 



LXVII. — Description of a neio Snahefrom Muscat^ Arabia. 

 By G. A. BOULENGER. 



In addition to specimens of DermocJielys coriacea, L., Zame- 

 nis diadema^ Sclileg., RliagerrMs jproducta^ Ptrs., Hydrophis 

 cyanocincta,, Daud., Echis carinata, Schn., and Echis colorata, 

 Gthr., a collection recently presented to the British Museum 

 by Surgeon-Major A. S. G. Jayakar, of Muscat, contains a 

 new Eryx^ which I have much pleasure in naming after its 

 discoverer 



Eryx Jayakari. 



Snout much depressed, the nostril projecting and with 

 trenchant edge ; a loreal groove ; nostril between three 

 nasals, the upper of which is the largest ; the rostral, the 

 two upper nasals, and an internasal meet with their angles, 

 the sutures forming an X ; upper head-scales small, in four 

 longitudinal series between the eyes, which are very small. 



