The species is found in the northeastern forests of the island of Tobago.

The genus Erythrolamprus belongs to the subfamily Dipsadinae, which is sometimes referred to as the family Dipsadidae.

The relationships of Erythrolamprus species located in northern South America (Venezuela) can be shown in the cladogram below, based on molecular DNA analysis:[2] E. poecilogyrus (paraphyletic) E. ceii E. poecilogyrus (paraphyletic) E. miliaris E. miliaris E. typhlus (Brazil) (paraphyletic) E. reginae (paraphyletic) E. reginae (paraphyletic) E. zweifeli E. breviceps E. epinephalus (Peru) (paraphyletic) E. epinephalus (Costa Rica) (paraphyletic) Erythrolamprus pseudoreginae E. melanotus E. atraventer E. jaegeri E. almadensis E. juliae E. cursor E. typhlus (French Guiana) (paraphyletic) E. cobella E. aesculapii (Brazil) (paraphyletic) E. ocellatus E. aesculapii (French Guiana & Guyana) (paraphyletic) E. bizona E. mimus Erythrolamprus pseudoreginae is dark moss green to olive brown colored, with a lighter yellow to red colored belly, and a faint lateral stripe.

[2] It lives in northeastern Tobago, within forested ravines of the Main Ridge.

Its habitat appears to be restricted to the lower montane rainforests of the region.