Alsophis rufiventris

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Colubroidea

Familia: Dipsadidae
Subfamilia: Xenodontinae
Tribus: Alsophiini
Genus: Alsophis
Species: Alsophis rufiventris
Name

Alsophis rufiventris (Duméril, Bibron & Duméril, 1854)

Type locality: “Brasil”.
Synonyms

Dromicus rufiventris Duméril, Bibron & Duméril, 1854: 668
Alsophis rufiventris — Garman, 1887: 282
Dromicus rufiventris — Boulenger, 1894: 124
Alsophis rufiventris - Schwartz & Henderson, 1991: 575

References

IUCN: Alsophis rufiventris (Duméril, Bibron & Duméril, 1854) (Endangered)
Alsophis rufiventris at the New Reptile Database

The red-bellied racer (Alsophis rufiventris) is a species of Colubrid snake that is endemic to the Lesser Antilles in the Caribbean, where it is found on the islands of Saba, Sint Eustatius, Saint Kitts, and Nevis.

Males have black-bordered blotches that transition into a dark mid-dorsal stripe towards the posterior. Females have a series of middorsal streaks and smudges that fade towards the posterior.

Other common names include the Saba racer and the orange-bellied racer.
References

Daltry, J.C. & Powell, R. (2016). "Alsophis rufiventris". IUCN Red List of Threatened Species. 2016: e.T942A115053994. doi:10.2305/IUCN.UK.2016-3.RLTS.T942A71739314.en.{{cite iucn}}: error: |doi= / |page= mismatch (help)

Day, M. (1996), Alsophis rufiventris, 2006 IUCN Red List of Threatened Species, retrieved 28 July 2007.
Malhotra, Anita; Thorpe, Roger S. (1999), Reptiles & Amphibians of the Eastern Caribbean, Macmillan Education Ltd., pp. 62–63, 67, ISBN 0-333-69141-5.