Casey — A Revision of the American Paederini. 145 



and very feeble sinuation at the middle of the apex; sixth narrow, with 

 a circularly rounded apical sinus, four or fivo times as wide as deep 

 and half as wide as the apex, the edge finely beveled, the surface con- 

 ically and moderately impressed along tin middle before the siuus, the 

 impression not abruptly formed and glabrous; female with the sixth 

 ventral conical, transversely sinuato-truncate at tip. Length 5.5 mm. ; 

 width 85 mm. Texas (Galveston) laetus Lee. 



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, is much 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 isinfuscate; 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 exti'eme 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 



