Casey — A Revision of the American Paederini. 243 
elongate, slightly narrower than the elytra, the eyes at scarcely more 
than their own length from the base, convex and prominent; basal part 
behind them broadly obtrapezoidal, the angles well rounded as usual; 
prothorax small, much narrower than the head, slightly longer than 
wide, the sides rather narrowly rounded at apical third, thence dis- 
tinctly converging and nearly straight to the rounded basal angles, the 
side margins with a tactile seta anteriorly and posteriorly; elytra large 
and much elongated, one-fourth longer than wide, with the sides 
broadly arcuate, gradually feebly converging toward tip, two-fifths to 
a half wider and three-fifths longer than the prothorax; abdomen at 
base not evidently wider than the prothorax, becoming somewhat dilated 
posteriorly. Male with the fifth ventral unmodified, the sixth with the 
very acute cusp-like notch as deep as wide, its sides gradually more 
widely flaring and broadly arcuate throughout, the opening a third as 
wide as the segmental apex. Length 3.65 mm.; width 0.6mm. Cali- 
fornia (San Diego to Humboldt and Lake Tahoe), Nevada (Reno), 
Washington State (Spokane) and British Columbia (Victoria). [= tri- 
signatus Boh.(?)]..-.cceccccccccececceccceeeses.slongiusculus Mann. 
19 — Head equal in width to the elytra, each elytron maculate with piceous. 
Body stout, parallel, black —or paler from immaturity,—the elytra 
alone pale flavo-testaceous, each with a small, posteriorly and inwardly 
oblique piceous cloud at its centre, the legs and antennae very pale as 
usual; head large, only very slightly longer than wide, the eyes rather 
small but convex and prominent, at about one-half more than their 
own length from the base, the sides behind them only very slightly 
converging, then broadly rounding into the broadly arcuato-truncate 
base; prothorax rather small, very much narrower than the head, longer 
than wide, the sides broadly rounded anteriorly, thence moderately 
converging and very slightly arcuate to the subcircularly rounded base, 
the side margins with the usual tactile seta anteriorly and posteriorly 
but small; elytra subquadrate, scarcely as long as wide, not narrowed 
at tip, the sides feebly diverging from the base and nearly straight, 
two-fifths wider than the prothorax and very slightly longer; abdomen 
broad, at base distinctly narrower.than the elytral apex especially in 
the male, at the apex of the fifth segment just visibly wider than any 
part of the elytra. Male with the fifth ventral unmodified, the sixth 
broadly arcuato-truncate at apex, with a small and acutely angulate, 
abruptly formed median notch, visibly deeper than wide, with its sides 
straight and the posterior angles slightly obtuse but only very narrowly 
rounded, the opening rather less than a fifth as wide as the segmental 
apex. Length 3.6 mm.; width 0.7 mm. Nevada (Reno) and California 
(Lake Tahoe to Sta. Clara).....seeeeeesereeeeeseeees FODUStUIUS 2. Sp. 
Head much wider than the elytra in both sexes, the elytra immaculate. 
Body moderately stout in form, black, the prothorax generally more 
or less piceous, the elytra brownish-testaceous, the legs and antennae 
pale; head large, slightly elongate, very much wider than the elytra, 
the eyes moderately large and prominent, at but little more than their 
own length from the base, otherwise nearly as in robustulus; prothorax 
elongate-ovoidal, very much narrower than the head, the sides very 
broadly rounded anteriorly, moderately converging and broadly arcuate 
