Casey — A Revision of the American Paederini. 183 



widely distributed genus. The species may be assigned to 

 two groups based upon the sculpture of the prothorax, but 

 those of the first group are mutually so closely allied, or at 

 least similar in general appearance, that I prefer for the pres- 

 ent to regard them as varietal modifications of a single species. 

 The following table contains all the species now known to 

 me: — 



Prothorax densely sculptured with fine anastomosing longitudinal rugae. 2 

 Prothorax with distinctly defined punctures, very rarely exhibiting traces of 



a longitudinally rugulose sculpture 3 



2 — Body subparallel, rather slender, dull in lustre, black or piceous-black 

 in color throughout, the legs and antennae also dark ; head distinctly 

 narrower than the prothorax, as wide as long, the sides parallel and 

 nearly straight, the basal angles rounded; eyes at about twice their 

 own length from the base, the punctures rounded and distinct, relatively 

 rather coarse and very dense; prothorax fully as long as wide, the 

 sides parallel and broadly, evenly arcuate, the angles all broadly 

 rounded; elytra much longer than wide, parallel, a fourth wider and 

 two-thirds longer than the prothorax, very minutely but strongly, 

 asperately and densely punctate ; abdomen parallel, slightly narrower 

 than the elytra, more shining than the anterior parts and sculptured in 

 wavy transverse lines of excessively minute and close-set asperulate 

 punctules; under surface of the head moderately strongly but rather 

 sparsely punctured, the gular sutures arcuate, feeble, widely separated 

 and distant at their most approximate point — which is well before the 

 middle — by the maximum thickness of the third palpal joint. Sixth 

 ventral of the male with a small rounded sinus at tip, the fifth unmodi- 

 fied. Length 3.3-4.0 mm. ; width 0.6-0.65 mm. California (Sonoma to 



Los Angeles Co.) rngosa Csy. 



Var A — Similar to the above but a little stouter and more evenly paral- 

 lel, black, the prothorax, elytra, legs and antennae paler, brown; 

 prothorax distinctly wider than long, less obviously wider than the 

 head, more transversely truncate at apex, with the anterior angles 

 more narrowly rounded; elytra large, much longer than wide but only 

 a fifth or sixth wider than the prothorax; eyes larger than in rugosa 

 and situated at less than twice their length from the base ; gular 

 sutures strongly arcuate, very feeble, at their closest point separated 

 by much less than the maximum thickness of the third palpal joint. 

 Length 3.6 mm.; width 0.65 mm. California (Sonoma and Calaveras 



Cos.) semibrnnnea n. var. 



Var B — Similar to rugosa but smaller and rather more slender, the pro- 

 thorax more truncate at apex and with narrowly rounded angles; 

 gular sutures more approximate, nearly as in semibrunnea; color 

 black throughout. Length 3.3 mm. ; width 0.55 mm. California (San 



Mateo Co.) angulata Csy. 



Var C — Smaller and rather more slender than rugosa, dark brown in 

 color with the pronotum, elytra, legs and antennae still paler; elytra 



