Cope.] ^84 [May 21, 



ACROCHORDID.E. 



Body compressed, acute below '. . . Chersydrus Cuv. 



Body round, flat below Acrochordus Hornst. 



NOTHOPID^E. 

 Scales above granular, with rows of tubercular scales ; urosteges simple ; 



no frontal or parietal plates Xenodermus Rhdt. 



Scales squamous ; urosteges double ; head scaly, with frontal and 



parietal plates Notliopsis Cope. 



COLUBRID^E. 

 Head conic, not distinct from the body, which is cylindric and rigid 



CALAMARIN.E. 



Head slightly distinct, short ; teeth entire, not enlarged in front 



CORONELLIN^E. 



Head similar to last ; posterior tooth grooved Scytallsle. 



Head more distinct and elongate, body and tail longer ; teeth entire, not 

 longer in front Colubrin^e. 



Like the last, but grooved teeth posteriorly Philodryadin^e. 



Very slender ; pupil horizontal ; grooved teeth Dryophidin^e. 



Less slender, not compressed ; middle teeth elongate, posterior teeth 

 grooved Psammophidin^e. 



Anterior maxillary and mandibular teeth enlarged Lycodontin^e. 



Anterior teeth not abruptly enlarged, posterior grooved ; head wide, very 

 distinct, body compressed Dipsadin^e. 



Anterior teeth not abruptly enlarged, the posterior weak and not grooved ; 

 head very distinct from the body, which is compressed ; no oesopha- 

 geal teeth LEPTOGNATIIIN.E. 



Maxillary teeth few and rudimental ; body slender ; hypapophyses pierc- 

 ing throat, and capped with enamel Dasypeltin^e. 



Hypapophyses spinous to caudal region ; anterior teeth not enlarged ; 

 body not slender ; head distinct Homalopsin^e. 



Calamarin^. 

 I. Posterior maxillary tooth grooved. 

 * Subcaudal scuta. 



One nasal ; anal undivided. . . Urieckis* Pet. 



Two nasals ; anal divided Ccrcocalomus Gthr. 



** Subcaudal scutella. 

 t No internasals. 



One nasal, no preocular Amblyodipsns Pet. 



One nasal, a preocular Apostolepis Cope. 



ft Two internasals ; prefrontals united together. 



One nasal ; a preocular ,Phalotris Cope. 



ttt Internasals united with nasals. 



Postnasal distinct, anal divided Stenorhimt I). & B. 



tttt Two internasals and two prefrontals. 



* Poiemon Jan. 



