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 
I have recognized twenty-seven species as valid: — 
Gular sutures very approximate..... Vaviaceoun deve Wecedecuseeesateed esse 2 
Gular sutures more or less widely Separated ......sscersesccscecseeseeeeld 
2 — Species of the Pacific coast regionS.......sesceseeereessacccscesere B 
Species peculiar to Arizona....... Acdecdd Santeaawnsawdera siweweee Pegg U 
3 — Median process projecting from the bottom of the broad sinus of the 
fifth ventral of the male abruptly limited at its sides.........sesseeee & 
Median process not abruptly limited laterally, broadly arcuate or becoming 
gradually feebly sinuate medially...........+ses. oe cccesceccene eoeel2 
4 — Median process about one-third as wide as the sinus or but slightly 
WIdORs beac ss Sdalteaen cost ees hgevsees Weld web acaenud. sé cenese dabencenee 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 
sides; 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... .sccersccccccevececcecceccesss VANCOUVEFI D. Sp. 
The median process wider and distinctly sinuate ........ eee eevee sceeesO 
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 addomen 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.).........shastanicum 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, 
