53. zAocys. 375 



Synopsis of the Species. 



I. A single loreal ; eight upper labials, fourth and fifth entering 



the eye. 



A. Scales in 16 rows. 



Two or four rows of scales keeled; sub- 



caudals 108-116 1. dhumnades, p. 375. 



Four or six rows of scales keeled ; sub- [p. 376. 



caudals 123—137 2. nigromarginatus, 



B. Scales in 14 rows, all smooth 3. luzonensis, p. 377. 



II. Two or three loreals ; scales in 16 or 18 rows. 



Two median rows of scales keeled ; sub- 



caudals 110-118 ; fifth and sixth labials 



entering the eye 4. carinatm, p. 377. 



Scales all smooth ; subcaudals 163-165 ; 



fifth and sixth labials entering the eye . . 5. fuscus, p. 378. 

 Scales all smooth ; subcaudals 123 ; fourth [p. 378. 



or fifth labial entering the eye 6. tenasserimeinis, 



1. Zaocys dhumnades. (Plate XXVI. fig. 1.) 



Coluber dhumnades, Cantor, Ann. 4" Mag. N. H. ix. 1843, p. 483, 



and Cat. Mai. Rept. p. 74 (1847). 

 Ablabes vittatus, Dum. 8^ Bibr. vii. p. 326 (1854) ; Jan, Arch. Zaol. 



Anat. Phys. ii. 1863, p. 281. 

 Coryphodon carinatus, part., Gi'mth. Cat. p. 112 (1858). 

 Zaocys dhumnades. Cope, Proa. Ac. Philad. 1860, p. 563 ; Qiinth. 



Rept. Brit. Ind. p. 256, pi. xxii. lig. A (1864). 



Eostral broader than deep, visible from above ; internasals shorter 

 than the praefrontals ; frontals once and one fourth to once and a 

 half as long as broad, as long as or a little shorter than its distance 

 from the end of the snout, a little shorter than the parietals ; loreal 

 longer than deep; one praeocular, with a subocular below it ; two 

 postoculars; temporals 2 + 2 or 2 + 1; eight upper labials, fourth 

 and fifth entering the eye ; five lower labials in contact with the 

 anterior chin-shields, which are shorter than the posterior. Scales 

 in 16 rows, the two median strongly keeled ; a second dorsal pair 

 may be feebly keeled. Ventrals 187-194 ; anal divided ; subcaudals 

 108-116. Anterior half of body olive above, with black edges to 

 the scales and a yellow or orange, black-edged vertebral stripe ; 

 upper lip and beUy yellow, the olive of the upper parts extending 

 down to the ends of the ventrals ; on the posterior part of the body 

 the upper surfaces turn to black and the lower to dark olive or 

 grey. 



Total length 1950 millim. ; tail 530. 



Southern China. 



