10. ANCISTRODON. 625 



above, with darker spots or cross-bars with serrated edges ; one .or 

 two lateral series of dark spots ; a dark spot on the snout, a pair 

 of spots on the vertex, and two pairs of oblique streaks on the back 

 of the head ; a dark, light-edged band on the temple ; lips speckled 

 with brown ; lower parts whitish, more or less speckled with grey 

 or brown. 



Total length 490 mUlim. ; tail 65. 



From the borders of the Caspian Sea and the Ural Eiver to the 

 Upper Yenisei. 



a. S (V. 155 ; C. 87). Mangyachlak. St. Petersburg Mus. [E.]. 



J. $ (V. 160; 0. 38). Anan, Mazandaran, W. T. Blanford, Esq. 



Elburz Mts. [E.]. 



c. d (V. 154 ; 0. 40). Ai Dara, Transcaspia. M. Eylandt [CA 



<?. cJ (V. 151 1 C. 38). Varnne,E. Turkestan. St. Petersburg Mus. [E.]. 



6. Ancistrodon intermedius. 



Trigonocephalus blomhoffii, pai-t., ScMeg. Phys. Serp. ii. p. 552 



(18.37), and Faun. Japan., Amph. p. 88 (1838'). 

 intermedius, Strauch, Trans. Assoc. Huss. Nat. i. Zool. (Russian), 



p. 295 (1868), ScM. Suss. R. p. 246 (1873), and Voy. Przewalski, 



Rept. p. 52 (1876). 

 Halys intermedia, Peters, Man. Bej-l. Ac. 1877, p. 736. 

 Ancistrodon intermedius, Bouhng. Ann. Sf Mag. N. H. (6) v. 1890, 



p. 140. 



Agrees in most respects with A. halfis, but the snout is not at all 

 turned up at the end, as in A. blomhoffii. 

 Total length 750 mUlim. ; tail 85. 

 Central Asia, Eastern Siberia, Mongolia, and Japan. 



a. Hgr. (V. 161 ; C. 49). Kunges, R. Ili, E. St. Petersburg Mus. [E.]. 



b. 2 (V. 166 ; 0. 45). Smeinogorsk.Gov. Dr. 0. Finscli [0.]. 



Tomsk. 



c-d. S (V. 155, 156 ; 0. Ohabarowka, Hr. Dorries [0.]. 



40, 40). Uasuri R. 



e. $ (V. 158; 0. 39). Usauri R. Warsaw Mus. [E.]. 



f-g. Hgr. (V. 157, 164 ; Tarim R., near St. George Littledale, 



'0. 42, 44). Lob Nor. Esq. [P.]. 



7. Ancistrodon blomhoffii. 



Trigonocephalus blomhoffii, Boie, Isis, 1826, p. 214 ; Oray, Cat. 

 p. 14 (1849) ; Bum. §• Bibr. vii. p. 1496 (1854) ; Strauch, ScM. 

 Russ. R. p. 251 (1873), and Voy. Azewalski, Rept. p. 52 (1876). 



blomhoffii, part., Schleg. Phys. Serp. ii. p. 5.52, pi. xx. figs. 8 & 



9 (1837), and Faun. Japan., Amph. p. 88, pi. vi. (1838). 



affinis, Oray, I. c. 



blomhoffii, var. niegaspilus, Cope, Proe. Ac. Philad. 1869, 



p. 336. 



Halys blomhoffii, Oiinth. Rept. Brit. Ind. p. 393 (1864). 

 Ancistrodon blomhoffii, Bouhng. Ann. ^ Mag. N. H. (6) v. 1890, 

 p. 140. 



