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) moutanum n. 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 all impressed. 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'Alfene) 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 

 4.4 mm.; width 0.75 mm. Arizona (Williams), — Mr. Wickham. 



arizonicnm 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 



