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......--esseseees ihenepeu sudae weed 
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. 65mm, California (Sonoma to 
LOS ANZeles CO. ).64-ccvececccevceccscinwssacce occcccccces eT IZOSA Cay, 
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.) + cereee soe eeececeeceres veces. cece sceccese SOMIPFUNNECA ND. 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. Length3.3mm.; width 0.55 mm. California (San 
' Mateo Co.) -.+.... setts eceeessceeeeeeeescecsessossssinotlata Csy. 
Var C — Smaller and rather more slender than rugosa, dark brown in 
color with the pronotum, elytra, legs and antennae still paler; elytra 
