32 NaTurRAL 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 foveze large, pubescent. Zlytra very 
feebly punctulate, shoulders acutely angulate; disk convex, 
discal line short. Addomen highly polished, pubescent, the 
basal carine strong and short. Legs long, thighs clavate, 
posterior tibize with a long terminal spur. : 
Habitat. Massachusetts to the Missouri river, north of 
the Ohio. 
Trimium, Azdé. 
Elytral base bifoveate, no subhumeral fovea, head larger. 
SYNOPSIS OF THE SPECIES OF TRIMIUM 
Eyes nearly in a level with the vertex; pronotal fovez and sulcus 
deep, : "i . 3 ; - - - -  foveicolle, Lec. 
Eyes far down on the sides of the head. 
a® Prothorax wider than long, less convex. 
Head with a deep arcuate impression; antennz not longer than the 
head, last joint one-third the length of the whole antenna; 
elytral discal lines short. Length, 1.5,mm. - lobifer, Lec. 
Head with the fovez not connected by a sulcus; antenne longer 
than the head; last joint acute; elytral dorsal line half the 
elytral length. Length,1.3mm. - - <cmpunctatum, Br. 
al Prothorax longer than wide, more convex. 
b? Lateral fovez and sulci of prothorax large and deep. 
Occiput concave, not channelled, pronotum punctured, ely tral 
discal lines very short. Length,o.9mm. - puncticolle, Lec. 
Occiput channelled, pronotum impunctate. Length, 0.9 mm. 
discolor, Lec. 
b1 Lateral fovez 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, 1.0 to 0.9 mm. - : - - parvulum, Lec. 
Occiput impressed, prothorax punctured, wider than the head. 
Length, 0.9 mm. - - - -  - thoracicum, Br. 
Occiput convex, not impressed, carinate, head as wide as the pro- 
thorax, frontal margin channelled, circumambient sulcus an- 
gulated. Length, 0.8 mm. - -  -  convexulum, Lec. 
