22 synopses and inscriptions. 



subtriangular or fused, sometimes displaced by the nasals. Scales keeled, 

 except in Hydrops. 



.Scales keeled; 



nasal divided; 



teeth smooth in continuous scries; 



loreal present tropidonatus, 



loreal absent or present storeria. 



nasal grooved or divided ; 



postmaxillary teeth larger and isolated 



HELICOPS. 



scales smooth; 



nasal grooved or divided ; 



postmaxillary teeth little larger hydrops. 



Tropidonotus. 



KvM, 1826. 



Stout to slender, tapering to head and tail, belly round; head distinct, 

 crown flat, occipital tract broad, snout narrow; tail tapering to a point. 

 Eye moderately large, pupil round. Teeth smooth and equal, or posterior 

 a little larger. Head-shields normal, anterior small. Nasal in two parts, 

 nostril between. Internasals small, narrowed anteriorly or triangular. 

 A loreal. Preoculars 1 — 3. Postoculars 2 — 5. Suboculars present in 

 T. cyclopivm. Scales keeled, pointed, truncate or emarginate, in 17 — 33 

 rows, outer broader. Subcaudals in two rows. 



Anal entire; 



series of rufous spots; rostral resembling that of Salvadora; series 



of scales 21 rujipv/nctatus. 



striped; series of scales 19 (17 — 19); slender saurita. 



striped and spotted; series of scales 17 — 21 sirtalis 

 Anal bifid ; 



banded transversely; series of scales 23 — 25 fasdatm. 



transverse bands and spots; series 29 — 31 taocispilotas. 



transverse bands to uniform ; with suborbitals ; scries 27 — 33 



cyclopium. 



irregularly spotted ; series 19 — 21 compresskaudus. 



spots in longitudinal rows ; series 19 Mrtlandii. 



striped ; orbitals 2 — 2 ; scries 19 leberis. 



