22 OPHIDIANS. 
No. of ; No. of 
No. Genera. Species. No. Genera. Species. 
1. | Typhlopide, 8 12. | Dipsadide, 10 
2. Tortricide, 2 13. | Lycodontide, 11 
3. Zenopeltide, 1 || 14. | Amblycephalide, 4 
4. | Uropeltide, 16 15. | Pythonide, 2 
5. | Calamaride, 6 16. | Erycide, 3 
6. Oligodontide, 2 17. | Acrochordide, 3 
cf Colubride, 4 18. | Elapide, 2 
8. Homalopside, 8 19. | Hydrophide, 7 
2: Psammophide, 2 20. | Crotalide, 4 
10 Dendrophide, 8 Ai) 1, Viperide, 25 
a a Total No. of Species,) 109 
The classification by Baird and Girard of existing species 
found in North America is differently arranged from Gin- 
ther’s, and has such a complicated nature that it has few - 
genera and fewer species in common with it. 
As far, however, as it is possible to harmonize all the 
classifications of different naturalists herein given, a summary 
gives the following 8 families, viz. : 
Famity I. CoLUBRIDz. FamiInty V. ELAPID&. 
Il. Bowz. Vi. HypropuHiIp#. 
Ill. TypHuopim *. VII. ViIrERID&. 
IV. CoLUBRIFORMES. VIII. CroraLtipz. 
Composed of 227 genera and 645 species; of all of which 
latter mention is made in this work. 
OPHIDIA COLUBRIFORMES. 
Innocuous Snakes, without grooved or perforated fanglike teeth 
wm front. 
First GENus—TYPHLOPID &. 
Body cylindrical, rigid, covered with comparatively large, polished 
5 
