CKOCODILIANS, LIZARDS, AND SNAKES. 733 



I. FCSIFOKM. 



Heinipenis smooth, smooth, simple ; sulcus furcate Calamaria Boie. ' 



Ilcmipeiiis transversely i)licate, sulcus simple; extiemity with two papilhe; aual 



ilivided Oligodon ISoie.^ 



Hemipenis smooth, or nearly so; apex membrauoiis; sulcus simple; anal entire. 



HoJarchns Cope.^ 

 Hemipenis similar to Ifotarchiis, but sulcus furcate; ana! entire Dicraitlax Cope ^ 



II. COI.UHIUFOR.M. 



III. DiPS.VDIKOKM. 



llemiix'uis bifurcate, w ith papilla' at the middle and smooth apex .. Pareas Wagler.' 



It is probable that several genera allied to Gahtmaria resemble it in 

 characters, and that Simotes Dumeril and Bibron belongs near to 

 Holarchns. From cheir general resemblance it is also probable that 

 AnoplodipsaH I'eters and Amhlycephalns Kuhl belong near to Pareas. 

 The snbfamily is entirely Oriental. 



XKNODOisrxinsr^. 



In this group Lystrophis has a close external resemblance to Hetero- 

 don, but the recurved rostral plate occurs also in the Scytaline genus 

 Rhiiwstoma, which has no relationship to either. I formerly referred 

 the Dromieine forms to this subfamily. 



After the subtraction of the Dromicintc a limited number of genera 

 are referable here. They are all colubriform and all neotropical. 



cp. Rostral plate not recurved. 



Hemipenis undivided ; no scale pits Jporopliit Cope. 



Hemipenis divided ; no scale pits Ophiomorphus Cope. 



Hemipenis divided; one scale pit Xenodon Boie. 



(pq). Kostral plate recurved. 



Hemipenis divided ; one scale pit Li/strophis Cope. 



r)Kc:).Mici:N'^-':. 



A. No proximal diverticulum of the left lung. 



I. Hemipenis transversely plicated (divided) (Flabellati). 



Plic.'o not papillose ; diacranterian Helicops Wagler. 



Plicajnot papillose; isodont Pseudocryx Fitzinger. 



PliciB papillose; isodont Rhahdonoma Dura<^ril and Bibron. 



II. Calyculate, and not capitate (Calyculati). 



q>. Hemipenis undivided. 



Fusiform ; isodont CarphopMops Gervais. 



Colubrifoi-m ; isodont; two nasals THadopliis Baird and Girard. 



Colubriform; diacranterian; one nasal Jmash'idmm Cope. 



Colubriform ; diacranterian ; two nasals Hypsirhijnchns Giinther, 



q)q). Hemipenis double. 



Fusiform; isodont; one internasal Farancia Gray. 



Fusiform; isodont; two internasals Ahastor Gray. 



Colubriform ; diacranterian ; no scale pits Dromicus liibron. 



Colubriform; diacranterian; one scale pit Monohothris Co\te. 



Colubriform ; diacranterian ; two scale pits Halsophis Cope. 



' Species examined C. gervaiaii. - 0. suhqiiadratus. 



•'//. unconis, II. dollcyauuii. ' D. tritiotatiis. 



■• /'. mallendorffii. 



