124 MEMOIRS ON THE COLEOPTERA. 



Datomicra pellax n. sp Stout, moderately convex, slightly shining, very 

 densely and asperately punctate, the abdomen much less closely; color 

 piceous-black, the elytra dark piceo-castaneous, the head and abdomen 

 deep black, the legs pale; head large, wider than long, the eyes very promi- 

 nent, at much less than their own length from the base, the tempora rapidly 

 converging behind them and much less prominent, the carinae not quite entire; 

 antennae blackish, moderately long, rather thick and distinctly incrassate, 

 the second joint much shorter than the first and scarcely visibly longer than 

 the third, the fourth slightly, the outer joints more evidently, transverse, 

 the last large, ogivally pointed, longer than the two preceding; prothorax 

 rather transverse, parallel and rounded at the sides, distinctly wider than the 

 head and not quite as wide as the elytral base, the median line distinctly 

 and not very finely impressed throughout the length; elytra large, moderately 

 transverse, with feebly diverging sides, the suture fully a third longer than 

 the prothorax; abdomen much narrower than the elytra, gradually and only 

 just visibly tapering, the fifth tergite longer than the fourth and very much 

 less punctured. Length 1.65 mm.; width 0.42 mm. Rhode Island (Boston 

 Neck). 



This is an aberrant species, not closely allied to any other and 

 possibly not a true Datomicra; the single specimen seems to be a 

 female. It is stouter and has a much larger head than stilla. 



Datomicra coruscula n. sp. Not very slender or convex, strongly shining, 

 the reticulation feeble, coarse, distinct and transversely wavy on the abdomen ; 

 punctures fine, not close or asperate, sparse on the abdomen; color black, 

 the elytra dark, the legs but little paler, piceous; head rather transverse, 

 the eyes large, at scarcely more than half their own length from the base, the 

 carinae entire; antennae rather short and slender, but feebly incrassate, the 

 second joint as long as the next two, the outer joints only slightly wider than 

 long, the last rather obtuse and shorter than the two preceding; prothorax 

 rather transverse, parallel, evenly and moderately rounded at the sides, 

 much wider than the head and very little narrower than the elytral base, 

 very feebly impressed along the median line; elytra well developed, sub- 

 parallel, very moderately transverse, the suture fully a third longer than the 

 prothorax; abdomen much narrower than the elytra, perfectly parallel. 

 Length 1.3 mm.; width 0.28 mm. California (Paraiso Springs, Monterey 

 Co.). 



To be readily known by its rather smooth surface, disposition of 

 the abdominal micro-reticulation and shining surface. The speci- 

 mens before me do not exhibit any notable sexual characters. 



Datomicra hebescens n. sp. Moderately fusoid, black, the elytra dark 

 piceous, the legs decidedly pale; punctures fine and close, strongly asperate, 

 becoming fine, sparse and simple only toward the abdominal apex, which 

 becomes more shining, with the reticulation rather fine, feeble and irregular; 

 head rather transverse, the eyes large, convex and prominent, at barely half 

 their length from the base, the carinae entire; antennae moderately long and 



