NORTH AMERICAN COLEOPTERA. 33 



This sj)ecies resembles the females of pedinatus and subsiuuatus, 

 but may be known from any of the species with narrowed hind coxal 

 plates by the obliteration behind of the outer carina of the juxta- 

 sutural sulcus. 



Occurs in New York, Massachusetts and Maryland. I am in- 

 debted to Mr. Fred. Blanchard for the only one I possess. 



i?I. subsiuuatus Lee. — Form moderately elongate, slightly narrower be- 

 hind, more so in the male, piceous or nearly black, moderately shining, very 

 sparsely clothed with very short brown pubescence ; antennae piceous, feebly 

 serrate, three-fourths the length of the body '^ , or a little shorter than that 9 ; 

 head coarsely and moderately densely punctured, a slight depression above the 

 base of the clypeus ; elypeus narrow at base, not more than half as wide as the 

 distance between it and the eye ; prothorax wider than long % , a little less 

 broad 9 , narrower in front, the sides sinuate at middle % , or nearly straight 9 , 

 the hind angles carinate, at tip incurved ; disc moderately convex, slightly de- 

 pressed at the hind angles, a distinct median impression extending from the base 

 to the middle, surface moderately, not densely punctured ; anterior supplemen- 

 tary carina at a right angle to the apical margin, extending nearly one-third 

 toward the base, j^osterior carina very long, reaching nearly three-fourths to 

 apex ; juxta-sutural sulcus deep and smooth, its external carina entire, reaching 

 the hind angles ; elytra obsoletely striate, moderately densely and roughly punc- 

 tured, the punctuation rougher and denser than on the thorax ; body beneath 

 rather coarsely and densely punctured ; metasternal episterna narrow, slightly 

 wider behind ; hind coxal plates narrower externally ; legs piceous, tarsi rufous, 

 fourth joint broader and distinctly lobed, claws distinctly dilated at base. 

 Length .14- .20 inch ; 3.5-5 mm. 



In this species I have observed no s]jecial variation beyond that of 

 color due to various degrees of maturity. The marginal ridge of the 

 apex of the thorax is less develojied than usual, and the posterior sup- 

 plementaiy carina very long. 



The female of substrlatus resembles, superficially, imperfectiis, but 

 the character of the posterior supplementary and the juxta-sutural 

 carina serve to separate them. M. substrlatus seems to have been 

 unknown to Bonvouloir, his description being nearly entirely quota- 

 tion. The measurement given is, however, incorrect, and should be 

 .2 inch ; 5 mm. 



Occurs in Canada, Nova Scotia, Ohio, D. C. and Virginia. 



WI. oblitus Bonv. — Form moderately elongate, slightly narrower posteriorly, 

 piceous, hind angles of thorax rufe.scent ; elytra dark reddi.sh brown, sparsely 

 clothed with very short yellowish pubescence ; antennae pale reddish brown, 

 serrate from the fourth to tenth joints, two-thirds as long as the body ; head 

 moderately, coarsely and densely jiunctate, slightly rugose, a slight carina on the 

 vertex ; clypeus at base much narrower than the space between it and the eye ; 

 prothorax a little wider than long, distinctly narrowed from the base to the apex, 



TRANS. AMER. ENT. SOC. (5) .JANUARY, 1886. 



