50 BULLETIN 32, UNITED STATES NATIONAL MUSEUM. 



PTTHONID.E. 



I. Premaxillary teeth present. 



a. FossiB iu labial plates of both jaws. 



Scuta on end of muzzle only Morelia Gray. 



Scuta extending to between orbits Python Daudin. 



Scuta covering vertex and muzzle. Liasis^ Gray. 



aa. Fossaa in inferior labials only. 

 Muzzle shielded to frontal region Nardoa Gray. 



atxa. No labial fossae. 



Head shielded ; tail prehensile Aspidiotes KrefFt. 



Head with nine regular shields above ; rostral plate protuberant ; tail not prehen- 

 sile Loxocemus Cope. 



II. No iiremaxillary teeth. - 



Labial plates with fossje ; vertex and front squamous; nostril in one nasal; scales 



smooth Chondropijtlwn Meyer. 



Head covered with large scuta Aspidopython Meyer. 



BoiDvE. 



I. Tail prehensile, 



a. Scales smooth. 

 j3. Labial fosssB present. 



Plates on muzzle only XipliosomaF' Wagl. 



Plates extending over muzzle and front Epxcrates'^ Wagl. 



/3/3. No labial fossic. 



Muzzle and front scaled; nasal plates meeting Lichanura Cope. 



Muzzle and front scaled ; nasal plates widely separated Boa'' Linn. 



Muzzle and front scutate ; nares vertical Ennectcs Wagl. 



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



C/u7a6o</irMs6 D. ifc B. 

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



cxa. Scales carinate. 



Top of head with symmetrical plates; nares between two Uvgnalia'' Gray. 



Top of head with symmetrical plates ; nares in a single plate BoUeria^ Gray. 



Plates on muzzle only Casarea^ Gray. 



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



Top of head scaly ; labial iilates meeting below rostral plate Trachyboa Pet. 



II. Tail not prehensile. 



a. Palatine teeth well developed. 

 (3. Eudiments of hind limbs visible. 



A mental groove Cronylyophis Wagl. 



No mental groove Eryx^" Daud. 



/3/3. No visible rudiments of hind limbs. 



Scales keeled ; head very distinct ErehopMs Gtlir. 



aa. Palatine teeth none (Peters). 

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



Calabaria^^ Gray. 



1 Liopython Hubrecht 

 ^ Teste Boulenger. ■ 

 s Corallus aud Chryxeiiis Gray. 

 ^ Epicarsius Fisch. 

 ^ A crantophis Jan. 



"Xljcliules Honialochihig Fisch. ; Pclophilus D. & B. (t= Sanzi nia Gray) ; Dendrophilus J.an.and Pies 

 gaster Seoaue. 



'' Troindopliits D. .fc T'. Notoj^his lla'.low. 



** Platijffcistcr B. ^t i'. 



^Le2>toboaD. Sc }'>. 



'" C((.soria Gray. 



'^ Pkoptrura Peters; may belong to the Charimdie. 



