462 Memoirs on the Coleoptera 



single interstrial lines, sparsely scattered and somewhat more distinct 

 over the under surface; beak in the male rather thick but cylindric and 

 almost smooth, feebly arcuate, and as long as the head and prothorax, 

 the antennae at three-fifths; prothorax as long as wide, slightly widest 

 about the middle, the sides parallel and broadly arcuate, abruptly con- 

 stricted at the tubulate apex, which is two-thirds as wide as the base; 

 surface with dense, elongate and anastomosing rugulae, even throughout, 

 the median line in part smooth but extremely narrow; scutellum small, 

 nude; elytra not quite twice as long as wide, equal in width to the pro- 

 thorax and four-fifths longer, the parallel sides straight, gradually 

 arcuate and converging — partially subsinuate — to the obtusely rounded 

 apex; striae moderate, deep and abrupt; intervals nearly twice as wide 

 as the grooves, each with a single series of rather close-set, distinct 

 punctures, a third as wide as the intervals, confused on the somewhat 

 wider third interval; under surface strongly but not densely punctate, 

 the pro pleura rugulate; pygidium vertical, twice as wide as long, very 

 convex and finely, sparsely punctate; abdomen deeply, rather narrowly 

 impressed medially toward base. Length (cT) 3.75 mm.; width 1.3 mm. 

 Wyoming (Laramie). 



Also allied to strigata but smaller, more slender, with less de- 

 veloped setiform squamules, much finer pronotal rugulse and finer 

 smooth median line, rather less coarsely sculptured elytra and 

 more finely and sparsely punctulate pygidium in the male; from 

 canadensis it differs in the finer interstrial punctures, smaller size 

 and much more slender form; canadensis is a little stouter than 

 strigata. 



Centrinogyna subaequalis n. sp. — General characters more nearly as in 

 procera, but shorter and much stouter; color black throughout, the lustre 

 alutaceous; squamules above extremely sparse, very small and barely 

 discoverable, uniform, only very little more evident beneath; beak in 

 the female long, slender, evenly and moderately arcuate, almost smooth 

 and distinctly longer than the head and prothorax, the antennae near 

 four-sevenths, the basal funicular joint as long as the next three, the 

 club abrupt, obtusely oval, its first joint distinctly less than half the 

 mass; prothorax barely visibly wider than long, the sides parallel and 

 very moderately, subevenly arcuate, gradually rounding and converging 

 before the middle to the tubulate apex, which is very short and scarcely 

 more than half as wide as the base; punctures small, irregularly close- 

 set, the smooth median line distinct, finer apically; scutellum narrower 

 than long, smooth and polished, emarginate behind; elytra scarcely 

 one-half longer than wide, a little wider than the prothorax and three- 

 fourths longer, the sides subevenly arcuate to the rather narrowly rounded 

 apex, becoming subparallel in about basal half, the humeral prominence 

 small but evident; striae rather coarse, finer behind except suturally, 

 finely punctured along the bottom; intervals basally but little, posteriad 

 nearly three times, wider than the striae, with moderate and rather close- 



