202 CALIFORNIA ACADEMY OF SCIENCES. 



Maxillary palpi rather small, secoucl joint very stronoly clavate, third nn- 

 uute, subglobulrir, fourth eloaj^ate, oval, moderately robust, longer than the 

 remainder taken together. Basal groove of proootum very stroug and deeply 

 impressed. Eyes rather large, convex and promiueut in both sexes. Elytra 

 having on the flanks, just behind each humeral prominence, a large spong- 

 iose fovea, which is continued to the elytral apex by a broadly and deeply 

 impressed groove, limited interiorly by a fine acute ridge. First three visible 

 dorsal segments of the abdomen subequal, first plightly the longer. 



Actium dift'ers from Euplecfcus in its more abrupt terminal 

 joints of the antennae, in tlie presence of spongiose fove^ on 

 tlie head, in the very much more robust and convex form of 

 body, and in the structure of the abdomen. In Euplectus, 

 as represented by Bonvouloiri Reit. and signatus Keichb. 

 the first three visible dorsal segments are equal, the fourth 

 very much longer; the second and third ventral segments 

 are equal in length. In Actium the fourth visible dorsal is 

 but very slightly longer than the third, and the second ven- 

 tral is distinctly longer than the third. It will be seen 

 therefore that the genus Actium properly occupies a posi- 

 tion intermediate between Trimium and Euplectus. 



The sexual characters at the apex of the venter are usually 

 quite complex. 



It is highly probable that our eastern representatives of 

 Trimium will also necessitate the founding of a separate 

 genus, although this cannot be definitely stated at present. 



LOMECHUSA Grav. 



L. montana u. sp. — Kobust, rather depressed; sides jarallel; pale rufo- 

 testaceous throughout; antennte and legs concolorous; pubescence very fii e, 

 sparse, abdomen polished, almost glabrous; anterior portions finely aluta- 

 ceous, elytra moie shining than the pronotum; under surface polished. Head 

 small, much wider than long; eyes rather large and prominent, at nearly their 

 own length from the base; sides behind them nearly parallel; very feebly ar- 

 cuate; front with a large deep impression; entire surface very minutely 

 granulose and excessively minutely, not densely punctate; antennae very slen- 

 der, not incrassate, two-thirds as long as the body; basal joint very large^ 

 twice as long as wide, rather abruptly narrowed at the base, not as long as 

 the next three together; second slightly longer than wide, not one-half as wide 

 as the first, scarcely two-thirds as long as the third; joints three to seven 



