NORTH AMERICAN COLEOPTERA. 9 



Female. — Antennae rufo-ferruginous, the basal joint sometimes darker; first 

 joint stout, second small, partly concealed, third as long as the next two, fourth 

 triangular, longer than the fifth, joints five to ten triangular, a little wider than 

 the fourth, subequal in length, but gradually wider, eleventh oval, nearly as 

 long as the next two ; last ventral segment acute at tip, penultimate segment 

 elevated at middle of posterior margin in a distinct mucro. 



The males are usually smaller and more slender than the females, 

 and have often a slight transverse impression of the middle of the 

 thorax. 



The median line of the thorax is a very variable character, often 

 the line is rather deeply impressed posteriorly and ends abruptly, it 

 may also continue slightly to the apical margin or be entirely vv^anting. 



The elytra are variable in coloration. I have a specimen entirely 

 piceous, another with a small spot at base on each side of the scutel- 

 lum, from this the yellow space becomes gradually longer and may 

 reach nearly to the apex. 



The male does not seem to have been known to Bonvouloir, and 

 very few of the other sex. I am entirely unable to separate two 

 species in the large material I have examined. The males are much 

 less frequent than the females. 



Occurs from Canada and New Hampshire to Missouri and Vir- 

 ginia. 



T. nnbila. Bonv. — Form elongate cylindrical, scarcely narrower behind, 

 entirely black, moderately densely clothed with sericeous fine pubescence form- 

 ing a distinct design ; antennse (rufo-testaceous?) wanting; head rugosely punc- 

 tured ; thorax as long as wide, sides straight posteriorly, slightly arcuate in 

 front, disc convex a distinct depression of the median line posteriorly, very 

 densely and finely punctate, surface in front marked with two rings of cinereous 

 pubescence ; elytra striate, strife finely punctured, the intervals finely granulate 

 toward the base, and slightly rugose posteriorly ; covered with dense ashy-gray 

 pubescence, forming a transverse band at middle, which is narrower at the su- 

 ture, oblique each side in front, the apical fourth also densely pubescent with a 

 small portion of the apex uncovered ; under side of body entirely black, inner 

 side of the posterior coxae and legs ferruginous. Length .20 inch ; 5 mm. 



This species I have never seen. It is known to me by the descrip- 

 tion and figure given by Bonvouloir and a drawing made by Major 

 LeConte from the same specimen. 



The only specimen known was collected more than fifty years ago 

 by Major LeConte in Northern Georgia and sent to Count Dejean. 



Tribe Eucnemini. 

 The head is not very broad, the mouth resting against the anterior 

 margin of the prosternum, the eyes at least in contact with the thorax 

 often partly concealed. 



TRANS. AMER. ENT. SOC. (2) JANUARY, 1886. 



