\ 
Casey — A Revision of the American Paederini. 175 
middle of the post-oral surface, where they are separated—as in 
the preceding species— by distinctly less than the maximum width 
of the third palpal joint. Median process of the fifth ventral two- 
fifths as wide as the sinus, moderately sinuate at apex in somewhat 
parabolic form, the sinus not extending quite to the side angles, which 
are right and but little rounded, its sides feebly diverging and straight 
thence to the base; fimbriate sides of the segmental sinus as in 
tahoense, the transverse discal lines of inclined bristles less developed. 
Length 3.8 mm.; width 0.73 mm. California (Truckee and Lake 
Tahoe) .ecceecceesses Coeb ds deiteedunsemsdead ane dace. montanum nD. sp. 
Piceous, though paler in color than the preceding, the head blackish and 
the elytra paler, the legs pale flavo-testaceous; head equal in width to 
the prothorax—even a little narrower in the female, parallel and 
straight at the sides behind the rather well developed eyes, the basal 
angles rather broadly rounded; prothorax distinctly obtrapezoidal with 
the sides nearly straight, obviously wider than long; elytra quadrate, a 
fourth to fifth wider than the prothorax; under surface of the head 
sparsely punctate, the gular sutures even less widely separated than in 
the two preceding species, and not at allimpressed. Median process 
of the fifth ventral nearly as in montanum but somewhat wider, the 
fimbriate sides rather shorter and more strongly curved, the discal 
rows of bristles nearly similar. Length 4.0 mm.; width 0.7 mm. 
Idaho (Coeur d’Aléne) ..........-- ec evcccccscccce «+++. boreale n. sp. 
26 — Moderately slender, larger in size, somewhat shining throughout, the 
punctures only moderately close-set on the head which is generally a 
little darker in color, very slightly wider than the prothorax, parallel 
and straight at the sides behind the rather small eyes and with well 
rounded basal angles; prothorax well developed, evidently obtrape- 
zoidal and wider than long; elytra relatively rather small in size, a fifth 
wider and two-fifths longer than the prothorax; under surface of the 
head strongly, moderately closely punctate, the gular sutures rather 
strongly convergent, becoming parallel at about the middle of the post- 
oral surface, where they are separated by but little more than half the 
width of the third palpal joint, strongly impressed. Median process of 
the fifth ventral but little less than one-half as wide as the sinus, which 
is rather deep, its apex feebly sinuate in circular arc throughout the 
width, its angles right but well rounded, its sides diverging thence to 
the base; fimbriate sides moderately curved but less widely diverging 
than usual, each with some eight or nine black spinules. Length 
4.4mm.; width 0.75 mm. Arizona (Williams),— Mr. Wickham. 
arizonicum n. sp. 
27 —Body small and moderately slender, piceous, the head blackish, the 
flanks and apex of the elytra broadly and nubilously pale testaceous, 
the legs pale as usual; surface shining throughout but with the punc- 
tures, even of the head and pronotum, close-set and minute; head 
small, about as wide as long, parallel and straight at the sides for a 
short distance behind the unusually large eyes, the basal angles broadly 
rounded; prothorax large, but just visibly wider than long, the sides 
subparallel and nearly straight, the angles rounded; elytra well devel- 
oped, quadrate, a third wider and not quite one-half longer than the 
