312 Coleopterological Notices, V. 



In the United States the genus, whatever it may prove to be, is 

 somewhat widely dififused and diversified in species, extending from 

 the Pacific coast to the Great Lakes ; I have not yet seen it from 

 the Atlantic regions however, although it possibly occurs here. 



The characters employed in my former tabular statement are 

 variable and difficult to observe, and the species may be much more 

 conveniently distinguished as follows: — 



Abdomen strongly narrowed toward base. 

 Tarsi with two long slender divergent claws. 

 Elytral suture much longer than the pronotum. 



Antennse long, very much exceeding in length the head and prothorax 

 combined. 

 Larger and stouter, very densely punctate species, the first two ven 



tral plates densely and strongly cribrate Talida 



Smaller and more slender, the abdomen beneath finely and sparsely 

 punctate, only the basal segment more coarsely so {exilis Csy.). 



exiniia 

 Antennae short and slender, not longer than the head and prothorax, 

 the outer joints strongly transverse ; species small ...brevicomis 

 Elytral suture scarcely perceptibly longer than the pronotum. 



Body rather less slender, the head semi-circularly rounded behind. 



Michigan lacustris 



Very slender, the head narrower and more parabolic behind from eye 



to eye. Pacific coast gracilis 



Tarsi with a single claw, composed of two somewhat shorter claws closely 

 united or connate, the dividing suture fine but distinct throughout the 

 length ; body slender, the elytral suture scarcely visibly longer than the 



pronotum brendeli 



Abdomen much wider, Very feebly narrowed toward base. 



Punctuation normal, the abdomen sparsely pubescent ; prothorax normal, 

 fully as long as wide. 

 Antennee longer, slender ; head finely, rather sparsely punctate. 



inoiiticola 

 Antennffi shorter and more incrassate, but slightly longer than the head 

 and prothorax ; head finely but densely and strongly cribrate through- 

 out lativeutris 



Punctuation of the upper surface excessively fine and dense throughout, 

 the abdomen extremely minutely, densely pubescent ; prothorax larger, 

 wider than long graildicollis 



Ea:ilis cannot be maintained as a distinct species, and there 

 appears to be very noticeable sexual variation in the size of the 

 prothorax and color of the body, the former being ralatively larger 

 in the male, and the female often being paler. The following species 

 of the above table are believed to be hitherto undescribed : — 



