Casey — A Revision of the American Paederini. 53 



Form slender, fusiform, rather depressed, polished, blackish-piceous in 

 color, the head testaceous, with an infuraate cloud at the centre of the 

 vertex; legs pale flavate, the antennae dusky rufous at base; head 

 strongly, moderately closely punctate; basal joint of the antennae as 

 long as the next three; prothorax slender and much elongated, much 

 narrower than the head, the sides parallel, broadly and distinctly arcuate* 

 the apex and base subequal in width; punctures finer than those of the 

 head, rather sparse, confused, the more regular close- set series along 

 the median smooth space somewhat impressed; elytra fully two-fifths 

 longer than wide, parallel and straight at the sides, fully three-fourths 

 wider and two-fifths longer than the prothorax, the humeral angles dis- 

 tinct, the punctures fine, close- set and altogether confused in arrange- 

 ment; abdomen slender, much narrower thaa the elytra, finely, not very 

 closely punctiite. Male with a small, deep, circular fovea just before 

 tht; centre of the secocd ventral and two entirely similar foveae at basal 

 third of the third ventral, the latter separated by an eighth or ninth of 

 the entire width; fifth segment broadly and very feebly sinuate toward 

 the middle, the sixth with a narrow and very deep cleft, bordered along 

 its sides by a narrow deep gutter, the two uniting at the bottom of the 

 cleft, forming a deep excavation which attains the base of the segment, 

 gradually narrowing to a very fine gutter near the base, the posterior 

 angles of the cleft rounded, the emargination nearly four times as deep 

 as its median width, the bottom obtusely rounded; female with the 

 fovea of the second ventral wanting, the two foveae of the third com- 

 pletely as in the male, the fifth arcuato-truncate, the sixth narrow but 

 broadly arcuato-truncate and simple at apex, the abdomen a little 

 broader than in the male and the head somewhat narrower and more 

 elongate. Length 4.6 mm.; width 0.7 mm. California (north of San 

 Francisco) pallidiceps Csy . 



Form nearly similar but rather stouter, polished, pale brownish-testaceous 

 throughout, the legs but little paler, the antennae scarcely at all dusky; 

 sides of the head behind the eyes feebly converging to the broadly 

 rounded basal angles; punctures finer, sparse; antennae longer and 

 more slender, nearly half as long as the body, the basal joint similar; 

 prothorax slender, elongate, much narrower than the head, the sides 

 parallel, nearly straight, rounding and more converging anteriorly, the 

 neck scarcely more than a third as wide as the head, the punctures fine, 

 feeble and rather sparse, the series as in pallidiceps; elytra as in that 

 species but still more finely punctate, fully four-fifths wider than the 

 prothorax and more than two-fifths longer; abdomen relatively a little 

 wider though much narrower than the elytra, finely but distinctly, rather 

 more sparsely punctate. Male with the second ventral wholly devoid of 

 any trace of fovea, the third with two foveae exactly as in pallidiceps, 

 the fifth arcuato-truncate at tip, with a small !»hallow and much more 

 abruptly defined median sinus, the sixth with a narrow very deep cleft 

 surrounded by a deep gutter as in pallidiceps; female not at hand. 

 Length 4.2 mm.; width 0.75 mm. Texas lepidus Lee. 



The species described by Horn under the name Ababactus 

 nactus, I have not seen, but would infer from the description 



