174 Trans. Acad. Sci. of St. Louis. 



abdomen more densely and subasperately punctate and duller ; head 

 small, narrow, as long as wide, scarcely perceptibly wider than the 

 prothorax, the sides parallel and straight behind the rather small eyes, 

 the angles well rounded; prothorax nearly as in gregale but with the 

 obtuse apical angles more rounded; elytra somewhat longer than wide, 

 about one-half wider and longer than the prothorax; under surface of 

 the head rather finely and sparsely punctate, moderately convex, the 

 gular sutures almost straight and parallel throughout the greater part 

 of their extent, noticeably more deeply impressed and more widely 

 separated than in either of the preceding species. Median process of 

 the fifth ventral very large, fully one- half as wide as the sinus, deeply 

 sinuate throughout its width at apex, with the angles narrowly rounded 

 and rather less than right, its sides parallel to the base; fimbriate sides 

 rather short, very slightly curved, each with about eight spinules; sur- 

 face of the segment just before the process with a large uniserial cluster 

 of very long close -set inclined bristles at each side of the middle. 

 Length 2.9 mm.; width 0.55 mm. California (Los Angeles Co.). 



debile n. sp. 



22 — Head about as wide as the prothorax or j ust visibly wider 23 



Head very small, narrower than the prothorax 27 



23 — Body in great part dark piceous or blackish in color; gular sutures 



moderately separated 24 



Body testaceous in color throughout 26 



24 — Head closely punctured and rather dull in lustre. Body piceous in 



color, the elytra and prothorax paler, sometimes dark testaceous with 

 the head blackish; legs pale; head just visibly wider than the prothorax, 

 a trifle smaller in the female, minutely, closely punctate, parallel and 

 virtually straight at the sides behind the rather small eyes, the basal 

 angles only moderately rounied; prothorax well developed, much less 

 punctate than the head and more shining, very slightly wider than 

 long, slightly obtrapezoidal in form, the angles rounded; elytra quad- 

 rate, barely a third wider and one-half longer than the prothorax; 

 under surface of the head rather closely punctate, rufous in color. 

 Median process of the fifth ventral somewhat more than two-fifths as 

 wide as the sinus, evenly and moderately sinuate in circular arc 

 throughout its width, its angles right and but slighly blunt, its sides 

 diverging thence to the base; fimbriate sides of the segmental sinus 

 feebly curved, each with about eight black spinules; surface before 

 the process with a transverse straight line of coarse and well spaced 

 inclined black bristles at each side of the middle. Length 3.9 mm. ; 



width 0.72 mm. California (Lake Tahoe) tahoense n. sp. 



Head sparsely punctured and polished 25 



25 — Piceous in color, the head blackish, the elytra and legs paler 



and testaceous; head somewhat wider than long, parallel and nearly 

 straight at the sides behind the rather well developed eyes, about equal 

 in width to the prothorax, the basal angles well rounded; prothorax 

 distinctly wider than long and evidently obtrapezoidal, with the sides 

 nearly straight, the angles narrowly rounded; elytra nearly as 

 in tahoense; under surface of the head rather flat, moderately closely 

 punctured, the gular sutures fine, feebly converging to about the 



