Vol. XXlx] ENTOMOLOGICAL NEWS 305 



Prothorax as long as head excluding mandibles, somewhat broader 

 than long, base two-thirds width of apex, sides arcuate in front and 

 almost straight behind, hind angles obtuse, lateral margin very narrow 

 and not wider at base, apex truncate, disc smooth, with a fine longi- 

 tudinal median line, the transverse lines and basal impression but 

 vaguely indicated. 



Elytra regularly oblong oval, almost one-third longer than head and 

 prothorax together, humeri obtusely rounded, disc smooth, with but the 

 vaguest traces of striae, six dorsal punctures. Body beneath smooth 

 and shining. Length 5.5 mm., breadth 1.75 mm. 



Type male and female in my own collection, collected at 

 Moss Beach, San Mateo County, California, July 7, 1912 

 Paratypcs to be deposited in the United States National Mu- 

 seum, Academy of Natural Sciences of Philadelphia, and Cali- 

 fornia Academy of Sciences. Over a hundred specimens seen. 



This beetle has been captured in the crevices of those rocks 

 situated just below the high tide mark, at the mouth of 

 Tomales Bay, Marin County, California, as well as at the 

 type locality, and one specimen from Carmel, Monterey Coun- 

 ty, California, in the collection of Mr. L. S. Slevin, has been 

 seen. It differs from T. barbarae Horn, a good figure of which 

 has been given by Schaeffer 3 , by being larger, by having 

 the prothorax proportionately broader, especially in front, and 

 by the color. The two species of this genus are not unique 

 among the Carabidae in living in the inter-tidal area, for we 

 have several closely related genera, such as Aepus with its 

 three species, A. marinus Strom, and A. robinii Lab. from the 

 south coast of England and west coast of Europe and A. gra- 

 cilicornis Woll. from the island of Madeira; Thalassophilns 

 longicornis Schaum, a species which, though normally a 

 streamside beetle, is sometimes found on the seacoast of Eu- 

 rope and Madeira ; Thalassobius tcstaccus Gay, a species from 

 the seacoast of Chili ; and Ilaphanus stcphensi MacLeay, from 

 Port Dennison, Australia, which is supposed to have similar 

 habits, as it was found "under stones in black moist soil close 



3 "Synopsis of the Species of Trechus, with the Description of a New 



Species," by Charles Schaeffer, Bull. Am. Mus. Nat. Hist., Vol. XI V 

 (1901), pi. XXVIII, fig. 6. 



