Casey — A Revision of the American Paederini. 167 



two rather arbitrary sections. The sutures in the second sec- 

 tion of the table are sufficiently separated to be readily 

 observed with an ordinary hand lens. In the following table 



1 have recognized twenty-seven species as valid : — - 



Gular sutures very approximate 2 



Gular sutures more or less widely separated 15 



2 — Species of the Pacific coast regions 3 



Species peculiar to Arizona 14 



3 — Median process projecting from the bottom of the broad sinus of the 



fifth ventral of the male abruptly limited at its sides 4 



Median process not abruptly limited laterally, broadly arcuate or becoming. 



gradually feebly sinuate medially 12 



i — Median process about one-third as wide as the sinus or but slightly 



wider 5 



Median process much wider, always very much more than one-third as 



wide as the sinus and always broadly and distinctly sinuate 9 



5 — The median process short, truncate, parallel -sided, scarcely more than 



a third as wide as the sinus, which is about three-fifths as wide as the 

 segmental apex, the sides of the sinus between the process and the 

 rectangular apices distinctly and evenly curved, and with the usual 

 fringe of black spinules well developed; gular sutures fine, feeble, 

 scarcely impressed, narrowly but perceptibly separated. Body moder- 

 ately stout, pale rufo-testaceous throughout, the head above and 

 beneath, prothorax, abdomen above and metasternum piceous -black; 

 head not wider than the prothorax, parallel and nearly straight at the 

 sid*s; prothorax a little wider than long, feebly obtrapezoidal and but 

 little narrower than the elytra, the latter scarcely longer than wide, 

 paler, rufous, the punctures sparse, the surface shining; abdomen 

 more densely and finely punctured. Length 3.9 mm. ; width 0.8 mm. 



Vancouver Island vancouveri n. sp. 



The median process wider and distinctly sinuate 6 



6 — Head parallel and straight at the sides behind the eyes, which are unusu- 



ally small, the basal angles rather narrowly rounded. Body dark tes- 

 taceous in color, the abdomen blackish; surface shining, rather sparsely 

 punctate, the elytra more finely and closely and the abdomen densely; 

 gular sutures fine, approximate though sensibly separated, scarcely 

 impressed; head distinctly wider than the prothorax, the latter sensibly 

 wider than long, very feebly obtrapezoidal; elytra rather longer than 

 wide, a fifth wider and nearly one-half longer than the prothorax. Sinus 

 of the fifth segment well developed, about three-fourths as wide as the 

 segmental apex, the process two-fifths as wide as the sinus, broadly 

 sinuate at tip, with its lateral angles rounded, the sides diverging to 

 the base ; sides of the sinus between the process and rectangular apices 

 feebly curved and with about eight black spinules. Length 3.7 mm. ; 



width 0.85 mm. California (Siskiyou Co.) shastanicmu n. sp. 



Head parallel but more or less feebly arcuate at the sides behind the eyes, 

 which are rather larger, the basal angles much more broadly rounded, 



