Casey — A Revision of the Americun Paederini. 227 
Color blackish-piceous, pruinose with very fine pubescence; head quad- 
rate behind the eyes, the hind angles rounded, the base ‘‘ emarginate,”’ 
densely punctate and dull above, the under surface densely and ru- 
gosely punctured; prosternum very feebly carinate; prothorax small, 
hexagonal, the base one-half wider than the apex, the sides obtusely 
rounded, broadly subangulate before the middle, the punctures fine 
and close-set but with the surface rather shining, the punctures smaller 
than those of the head, the median impunctate line distinct, moderately 
wide and not elevated; elytra strongly transverse, not longer than the 
prothorax, as wide as the head, finely, moderately densely punctate, 
the punctures distinctly separated; abdomen finely, densely punctate. 
Male with the fifth ventral not modified, the sixth with a small rounded 
median sinus at apex, the surface not modified. Length 4.7 mm.; width 
1.0mm. California........cccccccccenccsescecesseessQuadriceps Lec. 
Color dull rufo-testaceous, the legs and antennae concolorous, the head 
and abdomen above black, dusky beneath; body nearly similar to the 
preceding but with the prothorax slightly larger, not quite as long as 
wide, with the base very nearly twice as wide as the apex and the 
median impunctate line very narrow; elytra less transverse but much 
shorter than wide, somewhat longer than the prothorax and fully two- 
fifths wider, as wide as the head; abdomen short, at base fully as wide 
as the elytra, the sides parallel and arcuate, the third and fourth seg- 
ments materially wider than the elytra orhead. Male somewhat smaller 
and less stout than the female, the fifth ventral very feebly sinuate in 
about median third at apex, the adjoining surface feebly flattened, less 
punctured and glabrous; sixth segment not distinctly visible in speci- 
mens at hand but apparently with the sinus larger and shallower than 
in quadriceps. Length 3.6mm.; width1.1-1.2mm. Manitoba (Winni- 
PCL) cecesc rece rece cccccvevce-cossscseresesesess sesshanhami Wickh, 
The characters of guadriceps, given above, are derived from 
the original description and from some pencil notes taken by 
the writer from the original type some years ago. Theforms 
from Missouri and Massachusetts, said by Dr. LeConte to be 
identical, are unknown to me at present. Of hanhami Wick- 
ham, I have three specimens. 
Megastilicus Csy. 
This remarkable myrmecophilous genus is founded upon a 
large species, of very stout form, with unusually small orbic- 
ular head, densely opaque integuments of the ‘head and pro- 
thorax and with sparse vestiture consisting of short suberect. 
stiff bristles, which characters give it a facies wholly without 
parallel in the subtribe. It may be described as follows:— 
