Casey — A Revision of the American Paederini. 211 
Scopaeoma 0. gen. 
In a certain sense this genus and the two following form a 
group differing greatly from the broad-necked genera in some 
peculiarities of sculpture. In Orus and related genera, the 
punctures of the pronotum are very much larger as well as 
sparser than those of the head, while in Scopaeoma, Scopae- 
opsis and Scopaeodera, the thoracic punctures are, when pres- 
ent at all, equal to or smaller and sparser than those of the 
head; but in the first alone are they distinctly visible. In the 
second all the punctures become so minute as to be nearly in- 
visible and entirely filled by the bases of the fine hairs consti- 
tuting the pubescence, while in the last the punctuation be- 
comes wholly lost and the surface glabrous. The present 
genus approaches Scopaeus more closely than the other two 
in the nearly parallel and less convex form of the body and in 
the much shorter and somewhat thicker tarsi, with a form of 
the prothorax nearly similar to that of Pycnorus. The species 
are moderately numerous and extend over the entire northern 
part of the continent from the Atlantic to the Pacific, those 
known to me being distinguished as follows: — 
Head almost semicircularly rounded at base, smaller in size and relatively 
more elongate ereeeeeeees eee @eeeseeeeeeeeeeeeeeeteesseeeeeeeeseeeeeese 2 
Head large, brvadly truncate at base, scarcely at all longer than wide... 5 
2— Head distinctly wider than the prothorax..........seeee- avesseesaas O 
Head subequal in width to the prothorax, never more than very slightly 
WIDGET oc caidiccd sctdetecitccdodvsnccbsns auovcnseees Sd vedvetogvabauaece & 
3—Body slender, black, the legs pale brown throughout, the punctures fine 
and dense, less dense on the pronotum than on the elytra: head elon- 
gate, broadly concave between the antennal prominences. Male with a 
large oval concavity at the apex of the fifth ventral and a subquadrate 
emargination formed in part by short prolongations of the sides of the 
concavity, the floor of the concavity smooth, with a narrow, slender, 
posteriorly inclined, acutely attenuate spine, bearing at each side near 
its apex a short seta projecting laterally; sixth segment with a simple 
subparabolic sinus wider than deep and about a third as wide as the 
segment; middle tibiae somewhat abruptly thickened from behind the 
middle to the apex. Length 2.9 mm.; width0.5!mm. Vancouver Island. 
brunnipes Lec. 
Body parallel, rather convex, shining, black or slightly piceous in color, the 
legs piceous-black with the tarsi pale brown, the antennae dark brown; 
