18 
Rhadinaea godmani (Gunther, 1865). Mexico to Panama (western). 
Rhadinaea guentheri Dunn, 1938. Nicaragua, Costa Rica, Panama (to 
Panama Canal). 
Rhadinaea pachyura (Cope, 1875). Costa Rica, Panama (western). 
Rhadinaea pulveriventris Boulenger, 1896. Costa Rica, Panama 
(extreme western). 
Rhadinaea sargenti Dunn and Bailey, 1939. Panama (central, east 
of Panama Canal in Rio Chagres and Rio Pegueni watersheds). 
Rhadinaea vermiculaticeps (Cope, 1860). Panama (west, central). 
Rhinobothryum bovallii Andersson, 1916. Guatemala, Honduras, 
Nicaragua, Costa Rica, Panama, Colombia (northwest), Ecuador 
(northwest). 
Scaphiodontophis annulatus (Dumeril, Bibron, and Dumeril, 1854). 
Mexico (southeast) to Panama, Colombia. 
Sibon annulatus (Gunther, 1872). Costa Rica, Panama 
(western Atlantic versant, western Pacific versant at El 
Valle de Anton, eastern Pacific versant). 
Sibon argus (Cope, 1875). Costa Rica, Panama (eastern 
Pacific versant and western Pacific at El Valle de 
Anton). 
Sibon longifrenis (Stejneger, 1909). Costa Rica and Panama 
(Atlantic versants).. 
Sibon nebulatus (Linnaeus, 1758). Mexico to Colombia, Venezuela, 
Trinidad, Tobago, Ecuador, Brazil. 
Siphlophis cervinus (Laurenti, 1768). Panama (Panama Canal) to 
Colombia, Ecuador, Trinidad, Brazil, Peru, Bolivia. 
Spilotes pullatus (Linnaeus, 1758). Mexico (southern) to Brazil, 
Argentina (northern), Trinidad, Tobago. 
Stenorrhina degenhardtii (Berthold, 1846). Mexico (southeast) to 
Colombia, Venzuela, Ecuador (Pacific versant). 
Stenorrhina freminvillei (Dumeril, Bibron, and Dumeril, 1854). 
Mexico (Guerrero) to Panama. 
Tantilla albiceps Barbour, 1925. Panama (known only from the type 
locality-Barro Colorado Island in Gatun Lake in Panama 
Canal). 
Tantilla alticola (Boulenger, 1903). Nicaragua, Costa Rica, 
Panama (?), Colombia. 
Tantilla melanocephala (Linnaeus, 1758). Guatemala to Colombia, 
Venezuela, Guyana, Surinam, Trinidad, Tobago, Brazil, 
Ecuador, Peru, Bolivia, Argentina (northern). Not east of 
Andes. 
Tantilla reticulata Cope, 1860. Nicaragua, Costa Rica, Panama 
(Atlantic versant), Colombia (northwest Pacific versant). 
Tantilla schistosa (Bocourt, 1883). Mexico (southeast) to Panama 
(Panama Canal). 
Tantilla supracincta (Peters, 1863). Nicaragua (extreme 
southeast), Costa Rica, Panama (Atlantic and Pacific 
versants to central), Ecuador. 
Tretanorhinus mocquardi Bocourt, 1891. Panama (Atlantic and 
Pacific versants of the Panama Canal area only). 
Tretanorhinus nigroluteus Cope, 1861. Mexico (southeast, Yucatan) 
to Panama (Atlantic versant), Colombia (to City of Bogota). 
Trimetopon barbouri Dunn, 1930. Panama (known from the type 
locality only-Pedro Miguel in the old Canal Zone). 
