NORTH AMERICAN COLEOPTERA. 41 



The antennae differ in the proportions of their joints in our species 

 and will be described in their proper places. 



While Nematodes is evidently more related to Schizophilus, Epi- 

 phanis and Hypoccelus, the resemblance in many important respects 

 to Dromseolus must not be lost sight of, as there are several species 

 of the latter genus in which the antennal grooves are rather shallow 

 and not as sharply limited as in the majority. 



The species known in our fauna are as follows : 



Color piceous or dark brown ; last ventral segment distinctly prolonged ; size 



6 -9.5 mm 2. 



Color ferruginous, form slender ; last ventral not prolonged, but not obtuse ; size 



3.5 mm teres. 



2. — Joints 4-.5-6 of the antennse small, not longer than wide, the following joints 



equal, rather abruptly longer penetrans. 



Joints 4-5-6 longer than wide and very little shorter than the following 



joints. 

 Elytra gradually narrowed i)osteriorly from the humeri ; antennal depression 



near the middle of the i)ropleural triangle atropos. 



Elytra gradually narrowed posteriorly; antennal depression smooth, ex- 

 tending along the entire outer margin of the propleural triangle. 



puuctatus. 



Elytra parallel, narrowed only at a]ncal third ; antennal depression adjacent 



to the margin pavi<lus. 



N. atropos Say. — Snbcylindrical, elongate, attenuate ijosteriorly, subopaque, 

 very dark brown, almost black, sparsely clothed with a short grayish pubescence ; 

 antenuit paler brown, a little shorter than half the body, slightly shorter in the 

 female than the male, second joint longer than the fourth, third nearly equal to 

 the next two, four to eleven gradually longer, each longer than wide, joints six 

 to eleven a little wider than the preceding joints; head coarsely, densely and 

 vaguely punctured, a vague triangular impression above the base of the clypeus 

 with a vaguely impressed line on the front ; clypeus a little narrower than the 

 distance to the eye ; prothorax distinctly longer than wide, widest one-third 

 from apex, the sides from this arcuately narrowing to the front, behind nearly 

 straight, slightly convergent, hind angles acute, not carinate, slightly divergent, 

 disc convex, slightly flattened at middle, median line impressed, extending very 

 nearly to the apical margin, on each side a fovea more or less impressed, surface 

 densely and rugosely punctate ; elytra gradually narrowed posteriorly, surface 

 striate, the intervals flat, densely rugosely punctate, but less coarsely than the 

 thorax ; jyrosternum sparsely punctate, triangle of propleurse more densely punc- 

 tate, the antennal depression along its middle ; metasternura coarsely punctate ; 

 abdomen sparsely punctate at middle, more densely at the sides and very roughly 

 on the last segment, the apex of which is prolonged in a point ; legs reddish 

 brown. Length .24 - .36 inch ; 6 - 9 mm. 



This species is, as a rule, larger than the next, and differs in the 

 structure of the antennoe. 



Occurs from Canada to Louisiana. 



TKANS. AMER. ENT. SOC. ((')) FEBRUARY, 1886. 



