No. of i | No. Pi 
No. Genera. Species NOs 4 Genera. Sreciasl 
' 4. Typhlopide, a 12. | Dipsadide, | 10 
2. Tortricide, 2 | 18. Lycodontide, i EE 
3. | Zenopeltide, | Sait | 4 | Amblycephalide, | 4 
4. | Uropeltide, 16, 15. | Pythonide, a * 
5.  Calamaride, | 6 | 16. Ervcide, | 
6. . Oligodontide, _ 2° Wi. | Acrochordide, HB 
7. | Colubride, 4 18 Elapide. a 
S. Homalopside, 8 19. | Hydrophide, | 7 
9. | Psammophide, | = 2. | Crotalide, a 
10 Dendrophide, = * 21. | sept, , Be 
ze Geren oe Total No. of Species, 109 
The classification by Baird and. Girard of existing species 
found in North America is differently arranged from Giin- 
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 piven, a summary 
gives the following 8 families, viz.: 
Faniiy I. CoLtprips. Fasmiy V. Evarms. 
II. Bowz. VI. HypropHip£. 
III. TypHLorm =. VII. Virerm£. 
IV. CoLvtBRIFORMES. VIII. CroraLtm£. 
Compored 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 
in front. 
First Gescs—TYPHLOPID.E. 
Bedy cylindrical, rigid, covered with comparatively large, polished 
