292 MEMOIRS ON THE COLEOPTERA 



upper and lower bounding lines of a very broad entire sulcus; 

 atrolucens is like simplex in this respect. In venuslus there are 

 certainly two entire and separate striae, the upper a broad deep 

 sulcus, the lower a finer sulcus, both coarsely punctate. I can 

 find no correlation between these elytral lines and the lateral thoracic 

 striae, of which there are two distinct types in the genus: one having 

 a very fine marginal stria and within this a coarser stria, which is 

 free at both ends, represented by subrotundus; the other having 

 simply the very fine marginal stria, continuous with the fine apical 

 bounding line, represented by most of the other species of the genus. 



