Revision of the eastern Pacific species of Gobulus (Perciformes : Gobiidae), with description of a new species

Gobulus birdsongi is described as a new species from the Pacific coast of P anama. The two other known species of Gobulus from the eastern Pacific, Gob ulus crescentalis and G. hancocki are redescribed. Gobulus birdsongi differ s from other species in the genus in having more numerous second dorsal and anal rays. Gobulus hancocki differs from G. crescentalis in having a much smaller eye. The genus is distinctive in having reversed countershading, wi th the ventral surface of the body darker than the dorsal surface.