Abstract
Hypsirhynchus is a diurnal, terrestrial colubrid endemic to Hispaniola. It has a stocky, viperid-like body and head, with a relatively attenuated snout. It is strictly saurophagous, and undergoes an ontogenetic expansion in diet from small, largely scansorial iguanids (Anolis) to a large teiid (Ameiva chrysolaema). Comparisons are made with Uromacer frenatus dorsalis, an Hispaniolan tree snake that exhibits a similar dietary change.

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