2. AMBLY0EPHAXT7S. 441 



jfrom neck ; eye moderate, with vertical pupil ; nasal single. Body- 

 more or less compressed ; scales smooth or feebly keeled, without 

 pits, more or less oblique, in 15 rows, vertebral row enlarged or 

 not. Ventrals rounded. Tail moderate or short; subcaudals in 

 two rows. 



South-eastern Asia. 



Synopsis of the Species. 



I. A single shield between the nasal and the eye ; prsefrontal 



entering the eye ; one or two labials entering the eye. 



A. Prontal at least as broad as long ; symphysial in contact with 



an azygous chin-shield ; second or third lower labial very 

 large, usually in contact with its feUow ; ventrals 148-176 ; 

 subcaudals 26-55. 



Six upper labials 1. Icevis, p. 441. 



Seven upper labials 2. malaccanus, p. 442. 



B. Frontal longer than broad ; symphysial in contact with a 



pair of chin-shields ; ventrals 188-194 ; subcaudals 70-87. 



3. monticdla, p. 443. 



II. Loreal and prgeocular distinct ; eye separated from the labials 



by suboculars. 



A. Prsefrontal entering the eye. 



1. Scales smooth ; eye bordered by four or five shields ; 



ventrals 136-151 ; subcaudals 37-47. 



4. moellendorffii, p. 443. 



2. Dorsal scales feebly keeled. 



Eye bordered by" five shields ; ventrals 



153-155 ; subcaudals 38-46 5. andersonii, p. 444. 



Eye bordered by six shields 6. modestus, p. 444. 



Eye bordered by seven or eight shields ; 



ventrals 164 ; subcaudals 51 7. macularius, p. 444. 



B. Praifrontal excluded from the eye. 



Ventrals 138 ; subcaudals 53 8. margaritophorus, 



Ventrals 161-183 ; subcaudals 67- [P- 445. 



80 9- carinatus, p. 445. 



1. Amblycephalus IsBvis. 



Amblycephalus Isevis, Bote, Isis, 1827, p. 620 ; Boulery. Favn. Ind., 



B^pt. p. 415 (1890). 

 Dipsas Isevis, Schleg. Phys. Serp. ii. p. 287, pi. xi. figs. 24 & 25 



(1837). 

 Paieas Isevis, Bum. Sf Bibr. vii. p. 442 (1854) ; OUnth. Cat. p. 185 



