io8 MEMOIRS ON THE COLEOPTERA. 



the last pointed, as long as the two preceding; prothorax one-half wider 

 than long, parallel, distinctly and subevenly rounded at the sides, with a 

 feeble transverse ante-scutellar impression; elytra only just visibly 

 wider but two-fifths longer than the prothorax; abdomen distinctly nar- 

 rower than the elytra, parallel basally, evidently and arcuately narrowing 

 posteriorly from about the middle, the fourth and fifth tergites subequal 

 in length, the sixth (cf) truncate, the truncature feebly sinuate in about 

 median third, more transverse laterally to the fine, longitudinal, reflexed 

 and posteriorly somewhat prominent carinule at. each side. Length 2.3 

 mm.; width 0.66 mm. California (Oakland). 



This is evidently a typical Atheta; the mesosternal process is very 

 thin and gradually finely aciculate and the metasternal projection 

 angulate. 



Atheta lepidula n. sp. Form more fusoid, the coloration, sculpture 

 and pubescence nearly similar, except that the minute abdominal sculp- 

 ture is more distinct in loose wavy transverse lines; head rather more 

 transverse, four-fifths as wide as the prothorax, the eyes nearly similar, 

 the carinse not quite entire; antennae a little longer and somewhat less 

 incrassate, similar in coloration, the third joint very little longer than 

 the second, fourth only just visibly elongate, the outer joints slightly 

 less transverse than in audens, the last more elongate, more gradually 

 pointed, fully as long as the two preceding; prothorax relatively much 

 smaller though otherwise similar, except that the basal impression is 

 obsolete; elytra much broader and relatively shorter, fully a third wider 

 than the prothorax and nearly one-half longer; abdomen much narrower 

 than the elytra, parallel, with evenly arcuate sides, widest at the middle, 

 the fifth tergite slightly longer than the fourth, the sixth in the type 

 evenly sinuato-truncate from side to side, the lateral angles simple, 

 obtuse but sharply defined, not at all modified. Length 2.6 mm.; 

 width 0.72 mm. California (vicinity of Oakland and Berkeley). 



Closely allied to the preceding but differing obviously in many 

 ways, the much smaller prothorax and broader elytra giving it a 

 different habitus and, besides this, the rather less incrassate an- 

 tennae, with longer terminal joint and the narrower abdomen, 

 parallel and arcuate at the sides and not definitely more narrowed 

 apically, seem to be distinctive characters that cannot be over- 

 looked. The sex of the type is not definitely known; if it is the 

 female of audens, the antennae and abdominal characters are 

 certainly exceptional. This and the three preceding species are 

 allied to neutralis and aperta Csy., but differ from the former, in 

 their much larger head and, from the latter, in antennal structure, 

 shorter prothorax and other characters. 



Atheta socors n. sp. Moderately stout and convex, dull in lustre, the 



