Elacatinus limbaughi is described as new from the Gulf of California. Elaca
tinus digueti is redescribed and Elacatinus inornatus Bussing is synonymyze
d with E. digueti. Data are presented on geographical variation in Elacatin
us puncticulatus and E. digueti. Species of the genus Elacatinus are normal
ly associated with coral reefs and several of the species clean parasites f
rom other fishes. Elacatinus is regarded as distinct from Gobiosoma, based
on vertebral and other characteristics.