Casey — A Revision of the American Paederini. 53 
Form slender, fusiform, rather depressed, polished, blackish-piceous in 
color, the head testaceous, with an infumate 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 than the elytra, finely, not very 
closely punctate. Male with a small, deep, circular fovea just before 
the centre of the second 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, formicg 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 
BrANCIGCO) 0c oi ena WSs oie vccavew seca seoeee pallidiceps Csy. 
Form nearly similar but rather stouter, polished, pale brownish-testaceous 
throughout, the Jegs 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 simiiar; 
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 shallow 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 Lec. 
The species described by Horn under the name Ababactus 
nactus, I have not seen, but would infer from the description 
