STAPHYLIXID.E. 149 



long as the two preceding; prothorax large, strongly transverse, less rounded 

 at base than usual, parallel and rounded at the sides, more so anteriorly, 

 the apex narrower than the base as usual ; surface with a rather large rounded 

 median impression at base, much wider than the head and evidently wider 

 than any part of the elytra, which are short, with the suture about equal 

 in length to the prothorax; abdomen unusually broad, fully as wide as the 

 elytra, parallel basally, moderately narrowing apically. Length 1.8 mm.; 

 width 0.65 mm. California (Siskiyou Co.). 



To be readily separated from shastanica by its very much stouter 

 form, less basally rounded piothorax, larger elytra, broader abdomen 

 and other structural features. 



Acrotona prudens n. sp. Subparallel, convex, shining, black, the elytra 

 not distinctly paler, the legs pale brown; punctures fine and not conspicuous, 

 closer and asperate on the elytra, the abdominal reticulation distinct through- 

 out but fine; pubescence abundant, fine and rather dark but distinct; head 

 convex, moderately transverse, very feebly inflated at base, the eyes not 

 prominent, at fully their own length from the base; antennae piceo-testaceous 

 basally, evidently incrassate distally, the first three joints diminishing slowly 

 in length and thickness, the outer joints evidently transverse, the last slender, 

 pointed, scarcely so long as the two preceding; prothorax convex, large, only 

 moderately transverse, much wider than the head, wider than the base, but 

 about as wide as the apex, of the elytra, rounded at base, subparallel and 

 rounded at the sides, unimpressed; elytra short, with slightly diverging and 

 broadly arcuate sides, the suture only about three-fourths as long as the pro- 

 thorax; abdomen broad, fully as wide as the elytra, parallel basally, rather 

 strongly narrowed apically. Length 1.77 mm.; width 0.62 mm. Queen 

 Charlotte Islands and British Columbia (Metlakatla), Keen, 454. 



Nearly as stout as severa but having the prothorax much less 

 transverse, less laterally inflated and more rounded at base and 

 the elytra relatively much shorter. 



Acrotona adjuvans n. sp. Moderately stout and convex, shining, elongate- 

 fusiform, piceo-rufous, the head slightly darker, the abdomen suffused with 

 blackish except basally and at apex, the legs pale brownish-flavate; punc- 

 tures fine, close and asperate on the elytra; head strongly transverse, the 

 eyes moderate, at less than their own length from the base, the tempora gently 

 rounding to the base, not more prominent than the eyes; antennae pale 

 ochreo-testaceous throughout, very slender, scarcely perceptibly incrassate, 

 the first joint large and long, much longer than the second, which is not longer 

 but a little thicker than the third, the other joints longer than wide for the 

 most part, the tenth as long as wide, the last slender, gradually pointed, as 

 long as the two preceding; prothorax rather transverse, rounded at base, 

 parallel and moderately rounded at the sides, much wider than the head, 

 wider than the base but not quite so wide as the apex of the elytra, unim- 

 pressed; elytra large, with rather strongly diverging and nearly straight 

 sides, only moderately transverse, the suture a third longer than the prothorax, 



