Psomophis
Psomophis is a genus of snakes in the family Colubridae. The genus is endemic to South America.

Species
The genus Psomophis contains three species which are recognized as being valid.
Psomophis genimaculatus  - spirit ground snake, spirit diminutive snake
Psomophis joberti 
Psomophis obtusus  - wide ground snake 

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Psomophis.

References

Further reading
Myers, Charles W.; Cadle, John E. (1994). "A New Genus for South American Snakes Related to Rhadinaea obtusa Cope (Colubridae) and Resurrection of Taeniophallus Cope for the “Rhadinaea” brevirostris Group". American Museum Novitates (3102): 1-33. (Psomophis, new genus, p. 6).

Psomophis
Snake genera