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In the American Museum of Natural History, New York, there is an old specimen labelled as “<i>Holodromia harrisonwilliamsi</i> Boone, MS name” that was collected from Cocos Island in 1925. This name has never been published. An examination of the specimen shows that it is a juvenile specimen of <i>Homolodromia robertsi</i> Garth, 1973, a species described from Peru, which has since been reported from Chile and off the coast of Ecuador. This paper reports on the specimen <i>Homolodromia robertsi</i> Garth found in Costa Rica for the first time, a discovery that extends the known range of this species northwards.