OPHIDIA. 369 



As., N. Afr. ; Conophis Ptrs., Mexico, C. Am., S. Brazil ; Dipsadoboa 

 Gthr., W. Afr. ; Dipsadomorphus Fitz., trop. Afr., S. As., Papuasia, 

 Aust., about 22 species ; Ditypophis Gthr., Socotra ; Dispholidus 

 Duv., trop. and S. Afr. ; Dromophis Ptrs., trop. Afr. ; Dryophiops 

 Jan, S.-E. As. ; Dryophia Dalman, S.-E. As. ; Elapomoius Jan, 

 Brazil ; Elapomorphus Wieg., S. Am. ; Elapops, Gthr., W. Afr. ; 

 Elapotinus Jan; Erythrolamprus Wagl., trop. Am., Texas; Eteiro- 

 dipsas Jan, Mad. ; Geodipsaa Blgr., Mad. ; Hemirhagerrhis Boettg., 

 E. Afr. ; Himantodes Cope, Mexico to trop. S. Am. ; Hologerrhum 

 Gthr., Philippines ; Homalocranium D. and B., trop. Amer., about 

 25 species ; Hydrocalamus Cope, C. Am. ; laltris Cope, S. Domingo ; 

 Ithycyphus Gthr., Mad., Comoros ; Langaha Brug., Mad. ; Leptodira 

 Gthr., trop. and S.-Afr., trop. Am. to Texas ; Lycodryaa Gthr., 

 Comoros; Lycognathus D. and B., trop. S.-Am. ; Macrelaps, Blgr., S. 

 Afr. ; Macroprotodon Guichen., Spain and N. Afr. ; Manolepis Cope, 

 Mexico ; Micrelaps Boettg., Palestine, Somaliland ; MimopUs Gthr., 

 Mad. ; Miodon Dam., W. Afr. ; Ogmius Cope, Mexico ; Oxybelis 

 Wagl., trop. Am. ; Oxyrhopus Wagl., C. and S. Am., about 20 species ; 

 Philodryas Wagl., S. Am., about 13 species ; Polemon Jan, W. Afr. ; 

 Psammodynastes Gthr., S.-E. As. ; Psammophis Wagl., Afr. and S. 

 As., 17 species; Paeudablabes Blgr., S. Brazil, Uruguay; Pythona- 

 dipaas Gthr., trop. Afr. ; Rhamphiophia Ptrs., trop. Afr. ; Rhino- 

 bothryum Wagl., trop. S. Am. ; Rhinocalamua Gthr., E. Air. ; 

 Rhinoatoma Fitz., S. Am. ; Scolecophi^ Cope, C. Am. ; Stenophia Blgr., 

 Mad., Comoros ; StenorUna D. and B., Mexico, C. Amer., Colombia, 

 Ecuador ; Tachymenia Wieg., BoUvia, Peru, Chili ; Taphrometopon 

 Brandt, C. As., and Persia ; Tarbophia Fleischm., S.-E. Eur., S.-W. 

 As., trop. and N. E. Afr. ; Thamnodynaatea Wagl., S. Am. ; Thelotornis 

 Smith, trop. and S. Afr. ; Tomodon D. and B., S. Am. ; Trimero- 

 rhinua, Afr. S. of Eq., E. Afr. ; Trimorphodon Cope, CaUfomia to C. 

 Am. ; Trypanurgoa Fitz., trop. S. Am. ; Xenocalamua Gthr., trop. 

 Afr. ; Xenopholia Ptrs., S. Am. 



Sub-fam. 6. Elachistodontinae. Only a few teeth on the pos- 

 terior part of the maxiUary and dentary bones and on the palatines and 

 pterygoids ; some of the anterior thoracic vertebrae with the hypa- 

 pophysis much developed and capped with enamel one genus and 

 species. Elachiatodon weatermanni Reinh., Bengal. 



Series C. Pkoteroglypha. 



Anterior maxillary teeth grooved or perforated ; behind these poison 

 fangs a series of smaller soUd teeth ; all extremely poisonous and most 

 are viviparous. 



Sub-fam. 7. Hydrophinae. Sea-snakes. Tail strongly compres- 

 sed laterally, with the neural spines and hypapophyses very much 

 developed. Body more or less compressed ; eyes smaU with round 

 pupil ; marine (except one species of Distira confined to a fresh-water 

 lake at Luzon in Philippines), entering tidal streams ; except 

 Platurua specimens of which have been found at some distance from 

 water, exclusively aquatic ; all are viviparous ; as a rule they are not 

 found in mid-ocean, and some of them at least visit the shores of 

 low islands to give birth to their young ; Indian and Pacific Oceans ; 

 about 10 genera and 50 species. Hydrua Schn., Indian and Pacific 



z— 11. ^ ^ 



