Proceedings of the United States National Museum, Volume 53

abdomen anal angle antennae aperture apex apical appressed Ashmead Austral Avian Record base body BONAPARTE California carinae cephalothorax characters chitin clypeus color copepod coxae CREMASTUS curved designation and monotypy diameter dorsal dorsal surface egg strings EPITONIUM Eulima fathoms female Female.-Length flattened FÖRSTER front fusca genera genital segment genus Gulf of California HARTIG hind horns host joint KIEFFER larvae lateral lateral horns length Lernaea Lernaeenicus Lernaeocera Linnaeus malar space male mandibles margin MATHEWS maxillae maxillipeds median Melanella mesoscutum middle Monobasic narrow nearly neck ocelli Onychiurus Original designation oviducts ovipositor pair parasite paratype Pennella proboscis Proc pronotum propodeum punctate punctures rounded scutellum second tergite setae Shell short side slender slightly species specimens stout strongly suture swimming legs tergite thorax thorax segments tibiae torsion trunk twice as long Type Type.-Cat U. S. Nat U. S. NATIONAL MUSEUM varices ventral surface whorls wide wings Zool