REPriLKS FROM THE RIVJlR TAJAN. 



la- 



Mr. Lindholm measured specimens of G. longipes and obtained' 

 the following data : — 



^ (? ' ? 



Length of fore limb a .j, _^ 



Length of head and body ~ 0-48 to 0-51 ; average O'oO 0-49 to Q-ol; average O'oO 



Length of hind limb „,„„„„ „ _, 



T vf—F-y — 1 A^r-T- = 0"69 to 0-73; average 071 0-65 to 070: average 0-68 



Length ot head and bodj' ' » > n 



The comparison with the corresponding data of G. microlepis 

 shows the difierence in the length of limbs*. Besides G. lon- 

 gilJes has 12 to 15 supralabials, and the first pair of chin-shields 

 almost always forming a suture behind the mental ; on one 

 specimen only out of 14 these plates are separated by two small 

 scales. As to the size of the tubercles of the head, neck, and; 

 back, the scaling of the throat and belly, the number of femoral 

 and prfeanal pores, the two species seem to agree. 



There is a very interesting gradation in the characters of 

 'scaling between the three species G, mia-olepis, G. fedtschenkoi, 

 and G. casjnus. G. microlepis has the smallest and the most 

 numerous scales, its tubercles are relatively feebly developed ; 

 G . fedtschenkoi forms the link between the foregoing and G. cas- 

 pius, which has the lai-gest and the least numei-ous scales, and 

 very sti'ongly developed tubercles. The following table con- 

 tains the most important tlistinctive characters of these three 

 species : — 



G. microlepis. G.fedtschenJcoif. G-. casjOiMs J. 



Tubercles of the temple ... moderately conical. conical. trihedral. 



Before the ear-opening "2 or 3 small tubercle.^. 2 or 3 small tubercles. 1 large tubercle. 



On the neck slightly conical scales, moderately prominent very prominent large 



trihedral tubercles. trihedral tubercles. 



Tubercles of the back moderate, prominent, large, . prominent, not very large, very promi- 



not spinose. spinose. nent, often spinose. 



Gular scales '. : extremely small. very small. small. 



Numlter ot scales in a line^ 

 between the apex of the | 



mental or the suture of 'f 136 to 144. 123 to 131. 100 to 114. 



the chin-shields and the | 

 anal cleft J 



Number of ventral scales") 



across the middle of the [ 35 to 38. 30 to 33 §. 24 to 29. 



belly ) 



Suprafemorals on the inner I small, smooth, or in- moderate, distinctly large, strongly keeled. . 

 side of the thigh 3 distinctly keeled. keeled. 



Number of femoral and-; g 27 to 29 11. 



pra^anal pores ..^ ) ' " 



* Nikolski attributes as a distinctive character to G. longipes the greater diameter 

 of the eye, which he supposes to be longer than the distance from eye to nostril ; 

 with this statement Mr. Lindholm does not agree. 



t Material : 2 $ from Samarkand. 



X Material: 2 $ from Shemakha (Caucasus); 5 spec. {2 $ , 1 $, 2 juv.) from 

 Sangatshaly near l?aku (Caucasus) : 3 spec. (1 (5', 2 $ ) from Askhabad (Transcaspia), 

 1 $ from Anaii (Transcaspia), and the ^ described here from the river Tajan. 



§ 24 to 34 ventral scales and 30 to 37 pores, according to Nikolski, Fauna of 

 Kussia. Reptiles I., Petrogiad 1915, p. 78. 



II The maximum is 30, according to Nikolski, loc. cit. p. 74. 



