Casey — A Revision of the American Paederini. 223 



7 — Elytra large, much wider than the head 8 



Elytra small, always distinctly narrower than the head 9 



8 — Stout in form, convex, shining, obscure ruf o-piceous in color, the elytra 



subpiceous with pale apex, the abdomen blackish, the legs throughout 

 pale lateo-flavate; head fully as wide as long, rather coarsely punctate, 

 the punctures shallow, not coalescent but polygonally crowded, each 

 with a crater-like centre bearing a small hair, strong but sparse on the 

 under surface; eyes large, at scarcely their own length from the base, 

 the sides behind them rounded in circular arc to the feebly rounded and 

 broadly subtruncate base; labrum large, the teeth small; antennae 

 rather thick; prothorax unusually large, but little longer than wide, 

 nearly three-fourths as wide as the head, the obtuse angles at apical 

 third distinctly rounded, the punctures rather coarse but not very dense, 

 the surface shining, the broad polished impunctate median line not at all 

 canaliculate; elytra quadrate, more than one-half wider than the pro- 

 thorax and two-fifths longer, finely, subasperately and sparsely punctate ; 

 abdomen narrower than the elytra, minutely, subasperately and rather 

 closely punctate; legs only moderately long and slender. Male with 

 the fifth ventral broadly and feebly flattened toward the middle, the 

 apex rectilinearly truncate and unmodified, the sixth segment with a 

 large rounded sinus much wider than deep. Length 3.9 mm.; width 

 0.8 mm. Rhode Island, Virginia, Lake Superior and Texas (Austin). 



augnlaris Er. 

 Form and size the same as in a?igrwZam; color more nearly piceous; head 

 above rather finely and densely punctate, not rugose ; below rufo-piceous, 

 polished, somewhat sparsely punctate; sides behind the eyes slightly 

 convergent, the hind angles rounded; base truncate; prothorax densely 

 punctate, with a narrow, smooth and slightly elevated median line; 

 elytra more finely and sparsely punctate, the tips narrowly pale; ab- 

 domen very finely, moderately densely punctured. Male with the fifth 

 ventral toothed at the middle of the hind margin, the sixth triangularly 

 emarginate. Length 4.0 mm. California (Los Angeles and Kern Cos.). 



occidnns Fall 



9 — Moderately slender, subparallel, piceous-black, the elytra scarcely at 



all paler at tip, the abdomen black, the legs throughout pale luteo- 

 fiavate, the antennae dusky testaceous ; surface somewhat shining, the 

 punctures of the head and prothorax moderately coarse and densely 

 subconfiuent, of the elytra finer, subasperate and rather close -set, of 

 the abdomen very fine, subasperate and moderately dense; head large, 

 fully as wide as long, the eyes very large, convex and prominent, at 

 notably less than their own length from the base, the sides behind 

 them rapidly converging and broadly arcuate to the feebly arcuate base; 

 prothorax much elongated, only three-fifths as wide as the head, of the 

 usual form, the polished median line rather narrow but scarcely at all 

 concave; elytra relatively very small, notably shorter than the pro- 

 thorax and not much more than a fourth wider, quadrate, the sides very 

 feebly diverging from the base, the surface unusually depressed or 

 flattened; abdomen at base fully as wide as the elytra, wider at the 

 middle, the sides parallel and feebly arcuate as usual; legs long. 

 Male with the apex of the fifth ventral rectilinearly truncate and un- 



