306. ENTOMOLOC.ICAL NEWS [Oct., 'l8 



to the sea beach." Besides these, we also have certain of the 

 Bembidii and some Pogonus which are normally submerged 

 at times. 



Hydrophilidae. 

 Ochthebius lapidicolus n. sp. 



Elongate, subdepressed, dull black with but the faintest tinge of 

 bronzing, legs piceous. Head triangular, truncate in front, broader 

 across the eyes than apex of thorax, front with two deep foveae, 

 labrum with front margin broadly and shallowly emarginate. 



Prothorax about one-fourth broader than long, apex barely emargin- 

 ate, base narrower than apex and truncate, sides straight and strongly 

 divergent from apex to prominent median angulation, then slightly 

 sinuate and convergent to base, not serrate, lateral margin narrow in 

 front, broader behind, and continued around on to both base and apex, 

 not translucent, hind angles rounded, disc but slightly convex, with 

 shallow median longitudinal and accompanying sinuous lines but with 

 deep sulci at sides, the more elevated portions sparsely punctured and 

 with minute white hairs in each puncture. 



Elytra elliptical, almost one and one-half times as long as head and 

 prothorax together, with a narrow margin running from base to near 

 apex and without serration, disc faintly striate, the striae punctured 

 with large, elongate, shallow, and rather distantly placed punctures, 

 faint apically but more evident basally and at sides, each puncture 

 containing a minute white hair. Beneath finely and sparsely punctured 

 and pubescent. Length 1.5 mm., breadth 0.5 mm. 



Type and paratype in my own collection, collected from the 

 crevices of the inter-tidal rocks at Moss Beach, San Mateo 

 County, California, May ist, 1910. Paratypes to be deposited 

 in the United States National Museum, The Academy of Nat- 

 ural Sciences of Philadelphia and California Academy of 

 Sciences. Over fifty specimens examined. 



This beetle, because of its elongated, depressed, subopaque, 

 and but slightly sculptured surface, could not be confused 

 with any others of the genus that have so far been described 

 from this country. Its only close relatives are O. Icjoslisi 

 Muls. et Rey and its variety O. subintcgcr Muls. et Rey from 

 the south coast of England and the west coast of Europe 

 and 0. adriaticus Ritt. from, the coast of Dalmatia, which con- 

 stitute the subgenus Prionocthehius Kunert and, like it, are 

 true inter-tidal species. The first two, which I have seen 



