Casey — A Revision of the American Paederint. 145 
and very feeble sinuation at the middle of the apex; sixth narrow, with 
a circularly rounded apical sinus, four or five times as wide as deep 
and half as wide as the apex, the edge finely beveled, the surface con- 
ically and moderately impressed along the middle before the sinus, the 
impression not abruptly formed and glabrous; female with the sixth 
ventral conical, transversely sinuato-truncate at tip. Length 5.5 mm.; 
width 0.85 mm. Texas (Galveston) ....+cesceccescescoeee 1 ACtUS Lec. 
Other species of this genus occur in Mexico. The pleural 
fold of the elytra characterizing the preceding genera appears 
to be wholly obsolete in Dacnochilus, but the fine carina de- 
limiting the epipleurae proper is well developed. In Acalo- 
phaena there is a feeble vestige of the pleural fold posteriorly. 
Acalophaena Shp. 
This remarkable genus, although evidently related to Dac- 
nochilus, ismuch more highly specialized. The body is singu- 
larly compact longitudinally, broadly convex, with a relatively 
narrower neck than in Dacnochilus and with the abdomen 
densely punctulate, in striking contrast to that genus; the 
antennal joints are less narrowed toward base than usual 
or may be said to be almost subcylindric and the basal joint 
is not of the usually elongate cylindrical form, but is shorter 
and strongly compressed. Our only species known to me is 
the following : — 
Form very broad, convex, polished, bristling with long setae at the sides, pale 
testaceous throughout, except the abdomen, which is infuscate; head 
very transverse, trapezoidal, the sides strongly diverging to the narrowly 
rounded basal angles and almost straight; base very broad, truncate; eyes 
rather small, not prominent, at nearly twice their own length from the 
base, the punctures wholly wanting, except a few, small in size, sparsely 
scattered at the extreme sides; antennae very slender, only slightly 
incrassate, rather compact, as long as the head and prothorax, the 
latter not quite twice as wide as long, the sides slightly converging 
from apex to base and evenly arcuate; anterior angles distinct, the pos- 
terior broadly rounded; base and apex truncate; surface wholly sculp- 
tureless, except a few small punctures near the side margins, especially 
anteriorly; elytra two-thirds wider than long, the sides straight, 
slightly diverging at apex, slightly wider than the prothorax and nearly 
two-fifths longer; suture not beaded; surface not impressed along the 
suture, wholly sculptureless, except a few small punctures serially 
arranged at the extreme sides; abdomen short and broad, as wide as the 
