182 COLTJBRID^. 



a. Parietal not in contact witli the lower postocular ; sub- 

 cau^als 10::i-131. 



Eostral not twice as broad as deep 4. siimichrasti, p. 1 83." 



Eostral twice as broad as deep 5. coUaris, p. 184. 



h. Parietal in contact with both postociilars. 



Subcaudals 89-145 6. rjeminatus, p. 185. 



Subcaudals 47-76 7. suhjmnctatus, p. 186. 



2. 7 or 8 upper labials ; subcaudals 



56-70 8. sagittarivs, p. 187. 



B. Portion of rostral visible from above measuring two fifths its 

 distance from the frontal. 



9 or 10 upper labials ; subcaudals 73-75 . 9. bistrir/atus, p. 188. 

 8 or 9 upper labials ; subcaudals more than 



100 10. annulatus, p. 189. " 



1. Polyodontophis rhodogaster. 



Herpetodi'yas rhodogaster, Schley. Phys. Serp. ii. p. 193 (1837). 

 Enicognathus rhodogaster, part., Dtim. Sf Bihr. vii. p. 332, pi. Ixxx. 



fig. 2 (1854) ; J<m, Arch. Zool. Anat. Pki/s. ii. 1863, p. 273, (md 



Icon. Gen. 16, pi, iii. fig. 2 (1866) : Boettg. Abh. Senck. Ges. xi. 



1877, p. 8. 

 Polyodontophis rhodogaster, Boulenn. Faun. Ind., Rent. p. 302 



(1890). 



Eostral broader than deep, just visible from above ; suture 

 between the internasals shorter than that between the prsefrontals ; 

 frontal longer than its distance from the end of the snout, con- 

 siderably shorter than the parietals ; loreal deeper than long ; one 

 praeocular ; two postoculars, both in contact with the parietal ; 

 temporals 1 -|- 2 ; eight upper labials, fourth and fifth entering the 

 eye : four lower labials in contact with the anterior chin-shields, 

 which are as long as or a little shorter than the posterior. Scales in 

 17 rows. Yentrals 175-188 ; anal divided ; subcaudals 77-84. 

 Pale brown above, with a darker vertebral stripe, three scales wide, 

 edged on each side by a black line ; a dark brown streak along 

 each side, on the second row of scales ; upper surface of head dark 

 bi'own, with a yellowish spot on the outer side of the parietal 

 shields ; upper lips yellowish white, with a few black dots, and 

 edged with black above ; throat and lower surface of neck yellowish 

 white, dotted with black ; belly and lower surface of tail bright 

 pink in the middle, yellow on the sides ; a series of black dots may 

 be present on each side of the belly. 



Total length 650 millim. ; tail 170. 



Madagascar. 



a-c. S (V. 188 ; C. 77), 2 Madagascar. 

 (V. 186; C. 73). & vg. 

 (V. 176: C. 84). 



