372 MR. G. A. BOULENGER ON THE 



4. BOLIERIA. 



Gray, Zool. Miscell. p. 46 ; Bouleng. Cat. Sn. i. p. 121. 



1. BOLIERIA MULTICARINATA. 



Eryx multocarinata Boie. Isis, 1827, p. 513. 

 Bolieria multicarinata Bouleng. t. c. p. 122. 

 Round Island, neai- Mauritius. 



Family CoLUBRiD,Ti:. 

 Aglypha. 



Synopsis of the Genera. 



I. Pupil round; scales smooth (Madagascar and Comoro Islands). 



A. Body cj'lindrical ; scales not oblique. 



1. Snout rounded ; anal divided. 



a. Eye moderate or rather large ; nostril between two nasals ; subcaudals 

 65-160 ; scales in 17 or 19 rows. 

 Head short, not or but scarcely distinct from neck ; frontal 



not narrower than supraocular Polyodontophis. 



Head moderately elongate, distinct from neck ; frontal not 



narrower than supraocuhir, usually shorter than parietals . Trnpidnnotus. 

 Head elongate, distinct from neck ; frontal, in the middle, 

 narrower than supraocular, its length not less than that of 



parietals Bromicodryas. 



h. Eye rather large; nasal single; scales in 19 rows; 



subcaudals -il Compsopliis. 



c. Eye small ; scales in 17 to 25 rows ; subcaudals 35 to 64. 

 a. Loreal present. 

 Nostril between the nasals and the internasal ; frontal nearly 



twice as long as broad Linph Idium. 



Nostril between the nasals ; frontal not more than once and a 



half as long as broad Pseuduxi/rJiopus. 



(i. Loreal absent. 

 Nostril between the nasals and the internasal; frontal a little 



longer than broad ; ventrals 221-255 IdiopJi is. 



Nostril between the nasals ; frontal a little broader than long ; 



ventrals 163 Fararliadincea. 



2. Snout pointed, strongly projecting ; rostral very large, 



trihedral ; scales in 21 or 23 rows ; anal entire LioJieterodon. 



3. Snout depressed, with horizontal edge ; scales in 17 



rows: anal divided Heteroliodon. 



B. Body slightly compressed; scales narrow, oblique, in 



17 rows Micropistliodon. 



II. Pupil vertically elliptic; body cylindrical {Se3-chelles and Mascarene Islands). 



Scales keeled, in 17 rows ; no loreal Lycognatliophis. 



Scales smooth, in 21 or 23 rows Bondon. 



Scales smooth, in 17 rows Lycodon. 



1 . Polyodontophis. 

 Bouleng. Faun. Ind., Rept. p. 301, and Oat. Sn. i. p. 181. 



Three species : — ■ 



I. Scales in 17 rows. 



Loreal deeper than long; frontal much shorter than parietals... P. rliodogaster. 

 Loreal as deep as long or longer than deep ; frontal but slightly 



shorter than parietals P. torqnatvs. 



II. Scales in 19 rows V. mayoftensis. 



