STAPHYLINID/E 143 



as the eyes, the carinae entire; antennae black throughout, gradually and 

 moderately thick and incrassate distally, moderately long, the third joint 

 somewhat longer than the second, fourth and fifth a little longer than 

 wide, sixth to tenth equal in length, passing from as long as wide to 

 a third wider than long, the ninth and tenth mutually similar, the 

 last not quite as long as the two preceding; prothorax scarcely two- 

 fifths wider than long, parallel, with feebly, evenly arcuate sides, 

 the median line very obsoletely impressed, somewhat more broadly 

 basally to the feeble and rounded basal impression; elytra relatively 

 a little more transverse and with somewhat more diverging sides 

 than in the preceding, at base about a sixth wider, the suture fully 

 a third longer, than the prothorax; abdomen much narrower than the 

 elytra, distinctly narrowing and with nearly straight sides from the apex 

 of the first tergite though the fifth, which at apex is only about three- 

 fourths as wide as the first, a little longer than the fourth, the sixth (cf ) 

 with the two median teeth at the apex rather long, acute and upturned, 

 separated by a fourth more than either from the acute lateral processes. 

 Length 2.8 mm.; width 0.78 mm. California (Saucelito, Marin Co.). 



Readily separable from the preceding by the mutually similar 

 two penultimate antennal joints, by the larger head, less rounded 

 sides of the prothorax, still more tapering apical part of the abdomen 

 and other differences. A female example from Monterey does not 

 seem to differ specifically. 



All the species of Dimetrota here defined may fall in immediately 

 after resima, of my previous paper. 



Subgenus Engamota Csy. 



Reexamination of this subgenus under better light, shows that 

 the hypomera are horizontal and slightly warped and that it should 

 be attached provisionally to Dimetrota as a subgenus, instead of to 

 Acrotona as originally proposed by the writer. Both this subgenus 

 and Dimetrotina will come in before Dalotia Csy., which has more 

 the aspect of a genus than a subgenus, the sexual characters of 

 the male being of a type unknown in Dimetrota, and the sternal 

 features also being exceptional in this part of the Athetid series. 



Subgenus Dimetrotina nov. 



This name is here applied to a small species, having the hori- 

 zontal hypomera of Dimetrota but with a different habitus of the 

 body and with much shorter antennae. The infra-lateral cephalic 

 carinae are strong and entire, the middle coxae well separated, the 

 mesosternal process extending slightly beyond their middle, not 



