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 0.55mm. California (Los Angeles Co.). 
debile n. sp. 
22 — Head about as wide as the prothorax or just visibly wider......... 23 
Head very small, narrower than the prothorax..... Se poakisababe vee coos OE 
23— Body in great part dark piceous or blackish in color; gular sutures 
moderately SCPATATE 5.06 ccciccevcvccvces secsccewscecccccevemesues 24 
Body testaceous in color citowahoul sac rey CksGededwbdndaae’s hewupe ae 
24-— Head closely punctured and rather dullin 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 rounded; 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 ....-.ecsesccesseccsceesccccecsee LD 
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 
