Roatan Island agoutis closely resemble the widespread Central American agoutis, but are noticeably smaller in size, being only around 44 cm 17 in in head-body length. Their fur is orange brown over their entire bodies, fading to a paler, olivaceous shade on the underparts, and with grizzled black ticking over their backs. There is a white spot on the chin, and a yellowish patch on the belly. Unlike the naked ears of Central American agoutis, those of the Ruatan Island species bear a few dark hairs.[2]
The overall colour is said to be richer than that of Central American agoutis, although the differences are slight, so are less reliable than body size in distinguishing the two species
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