188(3.] 48 ) [Cope, 



BOIDJE. 



I. Tail prehensile. 

 a. Scales smooth. 



[3. Labial fossae present. 



Plates on muzzle only Xiphosoma* Wagl. 



Plates extending over muzzle and front Eijicrates\ Wagl. 



{3 t 3. No labial fossa?. 



Muzzle and front scaled ; nasal plates meeting Lichanura Cope. 



Muzzle and front scaled ; nasal plates widely separate.! Boa\ Linn. 



Muzzle and, front scutate ; nares vertical Eunecles Wagl. 



Muzzle and front with scuta divided on the median line ; nares lateral 



Chilabothrus% D. & B. 

 Muzzle and front with median scuta ; nares lateral. .. Ungualiophk Meyer. 



aa. Scales carinate. 

 Top of head with symmetrical plates ; nares between two 



Ungualia\ Gray. 

 Top of head with symmetrical plates ; nares in a single plate 



Bolieria^ Gray. 



Plates on muzzle only Casarea** Gray. 



Top of head scaly ; rostral plate forming border of mouth. Enygrus Wagl. 

 Top of head scaly ; labial plates meetiug below rostral plate 



Trachyboa Pet. 



II. Tail not prehensile. 



a. Palatine teeth well developed. 

 /?. Rudiments of hind limbs visible. 



A mental groove Gonglyoplris Wagl. 



No mental groove Eryx\\ Daud. 



jjjS. No visible rudiments of hind limbs. 



Scales keeled ; head very distinct Erebophi* Gthr. 



aa. Palatine teeth none (Peters). 

 Scales smooth ; top of head with symmetrical plates to between orbits ; 

 one nasal Calabaria\\ Gray. 



CHARINID^. 



Head scutate above ; scales smooth ; tail not prehensile ; palatine teeth 



Charina\\ Gray. 



* Oorallus and Chrysenis Gray. 

 t Epicarsius Fisch. 

 % Acrantophis Jan. 



I Includes Hunnloahilus Fisrdi. ; Pelnphilas D. & B. (= Sanzinia Gray); Den- 

 drophilus Jan, and Piesigasler Seoane. 

 || Tropidophis D. & B. Notophis Hallow. 

 1f Platygaster D. & B. 

 ** LeptnUna D. & B. 

 tt Cusoria Gray. 



Jt R'inp/.rura Peters; may belong to the Charinidse. 

 H Wenona B. & G. 



PKOC. AMER. PUILOS. SOC. XXIII. 124. 3j. PRINTED OCT. 15, 188 . 



