Casey — A Revision of the Amertcan Paederini. 49 
or very nearly so, parallel, finely, rather closely punctate but shining. 
Male with the fifth ventral unmodified, feebly sinuato-truncate at tip, the 
sixth with a triangular emargination, much wider than deep, occupying 
three-fourths of the apex with its angle well defined and not rounded, 
the notch gradually formed with broadly rounding sides posteriorly; 
female having the narrow sixth ventral arcuato-truncate at tip. Length 
8.7 mm.: width 1.5mm, Massachusetts and New Jersey. 
cribratum Lec. 
Form similar but more slender, convex, polished throughout, black, the 
elytra bright and paler rufous, with a small black scutellar spot; legs 
pale flavate, the antennae dusky, flavous toward base and apex; head 
elongate, much narrower than the elytra, almost wholly impunctate 
toward the middle throughout the length, very sparsely punctured 
toward the sides; prothorax nearly as in cribratum, very remotely and 
rather feebly punctate, the sides more converging anteriorly, the apex 
distinctly narrower than the base; elytra but little longer than wide, as 
long as the prothorax but much wider, the punctures scarcely as coarse as 
in cribratum and very much sparser, rather distinctly serial throughout; 
abdomen slightly narrower than the elytra, finely, rather closely punc- 
tate, with the pubescence much more distinct than elsewhere as in cri- 
bratum. Male with the fifth veutral unmodified as in cribratum, the sixth 
with a narrower and deeper triangular incisure, about half as wide as 
the apex, less gradually formed and much deeper than wide, the angle 
at the bottom narrowly rounded. Length 7.7 mm.; width 1.3 mm. 
South Dakota (Volga).......eseee sseeeeececseee sees FUbripenne 0. sp. 
There may be several closely allied forms in the Pacific 
coast region besides the very distinct tumidum, but it seems 
best to recognize only two species as known by material 
already collected, one — pacificum — with large elytra, much 
longer and wider than the prothorax, and the other — cali- 
Sornicum — with small elytra, about as long as the prothorax 
and but little wider. To the first I have attached a subspe- 
cies based upon differences of facies and slight modifications 
of the male sexual characters. The other also appears to 
have some slightly modified derivatives or subspecies, but 
they are not defined at the present time, it being’better to leave 
this difficult investigation for a future study with more ample 
material. The last two species of the table are aberrant and 
suggest Lissobiops in certain special characters, such as the 
more apically narrowed prothorax and coarse, sparse sculp- 
ture. Properum of Horn, which is the only described 
species not represented before me, appears to be more closely 
related to Cryptobiella, as shown by the original description ; 
