The Colubridae family is found in the Neotropics, North America, Mexico, Africa, Asia and Southeast Asia, the Indian subcontinent, New Guinea, Europe, and Australia.
This family has traditionally and inaccurately grouped all the non-front-fanged snakes that did not fit in other families, that is it served to provide a kind of "interim" status. This family has undergone reclassification and is now collectively and more accurately termed, "non-front-fanged colubroids" (NFFC).
NFFC are different from elapids and viperids as they do not possess the canaliculated (hollow or lumenate) venom apparatus located on the anterior maxillae (forward part of the upper jaw) found in these front-fanged species.
A detailed description of this family can be found here.