1926 ] European Subgenus Actedium in North America 
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the writer here designates Bembidion punctulatum Drap. as the 
genotype of that subgenus. 
It may also be noted that the species of Jacquelin-Duvars 
groups four and five, which were associated with group three in 
his monograph because of the punctuation of the head, all have 
the elytral fovese on the third interval, a character noted but 
not much valued by that author. Since the form described in 
this paper combines the habitus of Actedium with an elytral 
striation nearly as complete as in Princidium, the two subgenera 
may have to be united under the latter name, which has priority 
by a page. 
The species of Actedium, and that of Princidium as restricted 
above, differ from all hitherto described American species of 
Bembidion by having the depressions in the posterior angles of 
the prothorax entirely obsolete, and by having distinct non- 
setigerous punctures on the head and the sides of the pronotum. 
A partial exception is found in B. scopulinum Kby., in which there 
is a tendency toward rugosity on the floor of the frontal sulci, 
and of which a considerable percentage of specimens have a few 
scattered punctures on the front. In B. Icevigatum Say there are 
a few irregular frontal punctures, but these are setigerous and 
are not comparable. Several species of the ustulatum group have 
the base of the thorax, and more rarely an area near the apex, 
rugose; and this, too, is best developed in scopulinum. The sides 
of the thorax, however, are quite impunctate even in this species. 
Except for its subdilated hind body and the unique charac- 
ters noted above, Actedium is inseparable from Peryphus as the 
latter is employed by Casey (1); and it seems most closely re- 
lated to that part of Peryphus containing the more convex 
species of Hayward’s (4) ustulatum group. Princidium, which 
combines the habitus of a convex Peryphus with the technical 
characters of Actedium, brings those two subgenera even closer 
together. The gap remaining, however, seems too great, par- 
ticularly as regards the structure of the posterior angles of the 
prothorax, to allow Actedium and Peryphus to be united at 
present. The two subgenera should, of course, be associated 
on our lists. 
Before proceeding to the description, the writer must ac- 
