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 0.6 mm. Cali- 

 fornia (San Diego to Humboldt and Lake Tahoe), Nevada (Reno), 

 Washington State (Spokane) and British Columbia (Victoria). [= tri- 

 signatus Boh. ( ?) ] longiusculus 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-flfths 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 augulate, 

 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) robnstulns n. 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 rohustulus; prothorax 

 elongate- ovoidal, very much narrower than the head, the sidos very 

 broadly rounded anteriorly, moderately converging and broadly arcuate 



