STAPHYLINID^: 141 



Dimetrota Rev. 



The truly typical members of this genus occurring in North 

 America seem to be confined to the Pacific regions, when they are 

 very numerous and frequently above the average in point of size; 

 the following are some that are additional to those previously 

 described by the writer and others: 



Dimetrota immerita n. sp. Stout, moderately convex, alutaceous, 

 finely, closely and asperately punctate throughout anteriorly, with 

 fine and numerous punctures on the shining abdomen, becoming sub- 

 obsolete and very sparse apically; color somewhat bronzy-black, the 

 abdomen deep black, the elytra pale, piceo-flavate, infuscate about the 

 scutellum, the legs moderately pale, piceous-brown; pubescence fine, 

 short and palish; head nearly as long as wide, fully three-fifths as wide 

 as the prothorax, parallel and evenly arcuate at the sides, the eyes not 

 prominent but large, at evidently less than their own length from the 

 base, the carina? fine but distinct; antennae black throughout, rather long, 

 gradually and moderately incrassate, the third joint distinctly longer 

 than the second and as long as the first, fourth a little longer than wide, 

 the fifth as wide as long, the succeeding joints slightly transverse, the 

 ninth and tenth mutually similar, the last ogivally acute, as long as the 

 two preceding; prothorax rather small, one-half wider than long, parallel 

 and feebly arcuate at the sides, the latter more rounding at apex, the 

 base truncate medially, becoming strongly anteriorly oblique laterally, 

 the ante-scutellar impression large and rounded though feebly; elytra 

 at base a fourth wider, the suture two-fifths longer, than the prothorax; 

 abdomen distinctly narrower than the elytra, very slightly narrowing, 

 with just visibly arcuate sides, throughout, the fifth tergite barely longer 

 than the fourth, the sixth (d 1 ) with two moderate acute median teeth, 

 separated by an even gentle sinus and mutually much more distant 

 than either from the strong porrect lateral processes. Length 2.3 mm.; 

 width 0.65 mm. California (Riverside). 



In coloration this species resembles fenyesi Bernh., as well as 

 several others, but it differs in its much longer third antennal joint 

 and smaller prothorax among other characters such as the une- 

 qually spaced teeth of the sixth male tergite in immerita. The 

 two long oblique corneous processes of the male genitalia project 

 between the upper and lower plates of the sixth segment in the type. 



Dimetrota incredula n. sp. Somewhat as in the preceding in form, 

 coloration and sculpture, the head and abdomen however deep black, 

 the prothorax piceous-black and without bronzy glimmer, the elytra pale 

 piceo-flavate, scarcely at all infumate at the scutellum, the legs very pale, 

 with the femora in great part blackish; head slightly wider than long, two- 

 thirds as wide as the prothorax, the eyes moderately prominent, at less 

 than their own length from the base, the tempora not more prominent, 



