32 Natural History Bulletin. 



is rounded and not so large. Prothorax widest before the 

 middle, sides subangulate, sinuate towards the base, as long as 

 wide; the disk is tri-sulcate and bicarinate, the basal tubercle 

 on each side of the foveate posterior portion of the median 

 sulcus sharp, lateral foveae large, pubescent. JElytra very 

 feebly punctulate, shoulders acutely angulate; disk convex, 

 discal Hne short. Abdomen highly poHshed, pubescent, the 

 basal carinse strong and short. Legs long, thighs clavate, 

 posterior tibise with a long terminal spur. 



Habitat. Massachusetts to the Missouri river, north of 

 the Ohio. 



Trimium, Aude. 

 Elytral base bifoveate, no subhumeral fovea, head larger. 



SYNOPSIS OF THE SPECIES OF TRIMIUM 



Eyes nearly in a level with the vertex; pronotal foveae and sulcus 

 deep, .-...-..- foveicolle, Lee. 



Eyes far down on the sides of the head, 

 a* Prothorax wider than long, less convex. 



Head with a deep arcuate impression; antennse not longer than the 



head, last joint one-third the length of the whole antenna; 



elytral discal lines short. Length, 1.5, mm. - globifet\ Lee. 



Head with the foveae not connected by a sulcus; antennae longer 



than the head ; last joint acute ; elytral dorsal line half the 



elytral length. Length, t.3 mm. - - impiinctatum, Br. 



ai Prothorax longer than wide, more convex. 



b* Lateral foveae and sulci of prothorax large and deep. 



Occiput concave, not channelled, pronotum punctured, ely tral 

 discal lines very short. Length, 0.9 mm. - functicolle^ Lee. 

 Occiput channelled, pronotum impunctate. Length, 0.9 mm. 



discolor., Lee. 

 b^ Lateral fovea; small. 



c* Width across the shoulders as great as that of the prothorax. 

 d* Transverse sulcus deep. 



Occiput impressed, impunctate, head as wide as the prothorax. 



Length, i.o to 0.9 mm. - . .- - farvulum, Lee. 



Occiput impressed, prothorax punctured, wider than the head. 



Length, 0.9 mm. . . . . . thoraeiemn^ Br. 



Occiput convex, not impressed, carinate, head as wide as the pro- 

 thorax, frontal margin channelled, circumambient sulcus an- 

 gulated. Length, o.S mm. - - . - convexulum, Lee. 



