246 H. C. FALL. 



possible to say whether this is more than an accidental variation. 

 As might be expected in a species of so wide a range the variation in 

 minor details — chiefly surface sculpture — is considerable ; not so 

 great, however, as in nigritulum, a species of almost identical range. 

 The chief difficulty is to draw a line between this and grave, the 

 varieties of the two species approaching one another in a puzzling 

 way. The typical forms are easily separable ; the present being 

 distinctly more elongate in form, with sparser shorter pubescence, 

 less flattened eyes and non-impressed front. 



37. C robustum Horn. — Brown, oblong-elliptical, evidently less than 

 twice as long as wide, not or but feebly gibbous in profile. Pubescence short but 

 moderately dense, yellowish gray. Coarser punctuation moderate, showing a 

 tendency to a striate or vittate arrangement on the elytra, especially toward the 

 sides. Metasternum punctured throughout, but very remotely at the sides. 

 Eighth antennal joint triangular, a little longer than wide. Front tibiae bisul- 

 cate; middle tibiae sulcate. Length 3.5-4.5 mm. 



Hab. — Southwestern Texas. 



The larger measurement given above is on the authority of the 

 original description ; of the five examples before me the largest is 

 only 4 mm. in length. The largest specimens of grave approach in 

 size the smaller ones of robustum, but may be distinguished by 

 their less dense relatively longer pubescence and flatter more 

 strongly compressed eyes. 



38. V. grave Lee. — Brown, form quite robust, oblong-elliptical, slightly less 

 than three-fifths as wide as long, not distinctly gibbous in profile. Pubescence 

 moderately plentiful, but not concealing the surface sculpture ; coarser punctures 

 distinct throughout, moderate in size. Metasternum punctured from side to 

 side, the punctures finer and very sparse laterally. Eighth antennal joint trian- 

 gular, a little longer than wide. Front tibiae bisulcate; middle tibiae sulcate. 

 Length 2.2-3.7 mm. 



Hab. — Massachusetts, New York, New Jersey, Pennsylvania, 

 Maryland, Alabama (Oak Grove) ; Tennessee (Memphis) ; Louisi- 

 ana (Covington, Mandeville, Baton Rouge). 



The eyes, at least in the female, are flatter and more strongly 

 compressed than in any other species known to me. In nearly all 

 specimens there is a somewhat vague impression of the front close 

 to the anterior inner margin of the eyes. This impression, distinct 

 enough in certain lights, may be easily overlooked. I have not 

 noticed it in any specimen of vexatam, with which species grave is 

 most likely to be confused. For further comparison of these two 

 see remarks under vexatwn. 



