190 COLUBElDa;. 



Head narrow and elongate; rostral broader than deep, visible 

 from above ; internasals as long as deep or a little longer, as long 

 as the prsefrontals or a little shorter ; frontal narrow, bell-shaped, 

 about twice as long as broad, a little longer than its distance from 

 the end of the snout, as long as the parietals ; loreal much longer 

 than deep ; one prse- and two (rarely three) postoculars ; temporals 

 1+2 (rarely 2 + 2); eight upper labials, fourth and fifth entering 

 the eye ; four or five lower labials in contact with the anterior chin- 

 shields, which are much shorter than the posterior. Scales in 19 

 rowo. Ventrals 188^203 ; anal divided (rarely entire) ; subcaudals 

 81-111. Dark brown above, with two yellowish stripes two or 

 three scales wide ; head with or without light marblings ; upper 

 lip yellow ; lower parts yellowish or pale olive, the lateral ventral 

 keel witn a more or.less distinct dark line ; chin and throat with or 

 without olive marblings. 



Total length 1110 millim. ; tail 285. 



Madagascar. 



2. Dromicodryas quadrilineatus. 



Herpetodryas quadrilineatus, Sum. >§• Bibr. vii. p. 212 (1854). 

 bernieri, var. quadrilineatus, Jan, Icon. GSn. 31, pi. iv. fig. 2 



(1869) ; Jioettff. Abh. Sench. Oes. xi. 1877, p. 9, xi. 1879, p. 463, 



and xii. 1881, p. 443. 

 bernieri, var. trilineata, part., Boettg. II. cc. 



This form is very closely allied to the preceding, of which it has, 

 in fact^ been regarded as a variety. However it differs, in addition 

 to the very striking coloration, in having a less narrow head. 

 Ventrals 198 to 216 ; subcaudals 108 to 122. Pale olive above, 

 with a pair of black dorsal stripes (which may be confluent in 

 the var. trilineata) and a narrower lateral one, which gradually 

 disappears on the posterior part of the body and is altogether 

 absent on the tail ; head and nape dark brown or blackish above, 

 with six yellowish spots (disposed *••*), the anterior pair on the 

 parietal and second temporal shields, the second behind the parietals, 

 and the third just in front of and sometimes confluent with the 

 lateral dorsal stripes; lower parts yellowish, with an interrupted 

 dark line along each lateral ventral keel. 



Total length 1020 millim. ; tail 300. 



Madagascar. 



