[45] NORTH AMERICAN COLEOPTERA. 201 



transverse groove nearly one-half the distance between the latter and the 

 base; transverse groove deeply impressed, at slightly more than one-fourth 

 the length from the base, feebly, posteriorly arcuate; lateral fovete rather large, 

 moderately impressed. Elytra at base slightly narrower than the pronotum, 

 at apex one-half wider than the latter; sides eveuly and rather strongly arcu- 

 ate; humeral prominence convex, elongate; disk very finely, sparsely punc- 

 tate, nearly as long as wide, moderately and nearly evenly convex; stria one 

 deeply impressed, entire, two and three very closely approximate, finely im- 

 pressed, distinct, the former three-sevenths, the latter four-sevenths as long as 

 the elytra, four fine, deeply impressed, more divergent, one-third as long as 

 the disk. Abdomen slightly narrower and much shorter than the elytra; 

 border strong. Legs slender. Length 1.8 mm. 



California; (Sonoma Co. 1). 



This species, which is represented by the male, is easily 

 distinguished from the others by the brevity of the second 

 and third elytral striae. It is further distinguished by the 

 shape of the pronotum and by the form of the frontal im- 

 pressed groove, which is here very strongly arcuate, more 

 so than in convexus. 



The antenna? are very similar in structure throughout, 

 but present slight differences mainly affecting the lirst, 

 ninth, tenth and eleventh joints. 



ACTIUM n. gen. (Euplectini.) 



The Californian species hitherto placed in Trimium in re- 

 ality form a very distinctly characterized genus. In the fol- 

 lowing comparative statement, I have had before me a male 

 and female of the European Trimium brevicorne Reichb. 

 which was taken by Aube as the generic type. In Trimium 

 as thus represented, the eyes are very unequal in the sexes, 

 in the males being moderate in size, in the females much 

 smaller. The pronotum is crossed by a very fine, feebly 

 impressed, basal groove. The flanks of the elytra are per- 

 fectly devoid of humeral fove;e. The first visible dorsal 

 segment is elongate, equal in length to the next two together. 



The generic character of Actium may therefore be briefly 

 given as follows: — 



