NORTH AMERICAN COLEOPTERA. 35 



the puuctuatiou less dense and finer than on the thorax ; body beneath more 

 shining than above, the puiictiiatiou moderate, but not dense ; metasternal epis- 

 terna rather broad and parallel ; posterior coxal plates much narrower externally ; 

 last ventral segment with a large pubescent fovea % , or simple 9 ^ the tip pro- 

 longed in an obtuse point % , or rounded 9 ; fourth tarsal joint dilated and lobed 

 beneath, the claws slightly broader at base. Length .22 - .26 in(;h ; 5.5-6.5 mm. 



This is the largest species in our fauna. It is easily known by the 

 deep impression of the middle of the disc of the prothorax and the 

 very long posterior supplementary carina. The juxta-sutural sulcus 

 is relatively narrow, so that the space exterior between it and the 

 supplementary carina is at least three times the width of the sulcus. 



After a careful study of a specimen in the cabinet of Dr. LeConte 

 in comparison with the descriptions of Bonvouloir, I feel constrained 

 to unite miicklm Bonv. and impremcoUifi. The former diftei's mei'ely 

 in the absence of the pubescent fovea in the last ventral segment, 

 the latter being obtuse at tip. The differences seem purely sexual, 

 impresi^koUh being probably the male. I am indebted to Mr. Salle 

 tor a typical male. 



Occurs in Florida, Louisiana and Texas. 



With this S])ecies Bonvouloir has associated M. Salilbergl Mann., a 

 rare species of Europe, which has on the penultimate ventral seg- 

 ment a pubescent fovea. I do not find this character mentioned by 

 any other European author. It would be interesting to learn if it 

 is merely sexual. 



M. BoMVOuloiri n. sp. — Form moderately elongate, narrower behind % , 

 or nearly parallel 9 • piceous, moderately shining, sparsely clothed with very 

 short fulvous pubescence ; antennpe rufo-ferruginous, longer than half the body, 

 the joints three to ten distinctly longer than wide and slightly serrate % , or 

 not serrate 9 > head coarsely and closely punctate, front above the epistoma de- 

 pressed, vertex with a fine impressed line 'J, ; clypeus as broad at base as the dis- 

 tance to the eye ; prothorax as long as wide, sides parallel, rounded near the front 

 angles, hind angles carinate ; disc of thorax convex, a distinct oblique de]iression 

 within the hind angles, surface coarsely, den.sely and very roughly punctured; 

 anterior supplementary carina short, slightly arcuate, po.sterior carina long, nearly 

 reaching the apical margin ; juxta-sutural sulcus moderately deep, parallel, the 

 outer carina entire, extending obliquely to the hind angles but less elevated in 

 this posterior portion ; elytra vaguely striate, surface coarsely and roughly punc- 

 tured, l)ut less densely than on the thorax ; body beneath coarsely and closely 

 punctate, rather roughly on the last ventral segment ; presternum at tip obtuse 

 and rounded ; metasternal episterna very narroAV in front, wider po.steriorly ; hind 

 coxal plates wide and parallel ; femora piceous, tibife and tarsi rufo-ferruginous, 

 fourth tarsal joint narrow, not lobed beneath, claws slightly dilated at base. 

 Length .12 -.18 inch ; 3-4.5 mm. 



