134 Trans. Acad. Sci. of St. Louis. 
and not truly to that of California. The species represented 
in my cabinet may be divided for convenience into several 
sections, as shown in the table, based largely upon general 
habitus. The section represented by ambigua Lec., is very 
distinct in facies from the others. The species may be 
known by the following characters : — 
Species of the ventralis type. Head small; prothorax larger, parallel, with 
all the angles rounded, the elytra large, with the punctures finer, more 
close-set and sometimes not distinctly serial.........cceececsecceses 2 
Species of the collaris type. Head small; prothorax nearly as in the pre- 
ceding, the anterior angles generally less rounded, the surface more 
coarsely punctured; elytra wider and longer than the prothorax but 
usually smaller than in the ventralis type, with the punctures coarser, 
sparser and arranged in more or less impressed serieS.....e.seeceee 8 
Species of the aemula type. Head moderately small; prothorax oblong, 
with all the angles more or less rounded; elytra much less developed, 
but little wider and longer than the prothorax, with the punctures 
arranged in close-set impressed SerieS.......cecccsscccccseccsecssce 7 
Species of the ambigua type. Body smaller and more depressed than in the 
preceding sections, the head subequal in width to the prothorax, the 
latter elongate, parallel, narrow, with the sides straight, the anterior 
angles right and not obviously rounded; elytra longer and much wider 
than the prothorax, with the punctures rather irregularly serial..... 10 
2— Body moderately stout, black, the prothorax slightly piceous, the entire 
abdomen paler, dark piceo-rufous, the legs and antennae pale; surface 
polished, the abdomen densely dull; head about as long as wide, the 
Sides behind the eyes distinctly converging and straight. to the basal 
angles, which are obtusely rounded, the punctures coarse and sparse; 
eyes rather prominent, at one-half more than their own length from the 
base; antennae moderately slender, feebly incrassate distally, as long 
as the head and prothorax, the medial joints about one-half longer 
than wide; prothorax much wider than the head, distinctly longer than 
wide, the sides parallel and very feebly arcuate, the punctures not very 
coarse but deep and distinct, sparse, more aggregated narrowly along 
the median smooth line; elytra parallel, distinctly elongate, two-fifths 
wider and longer than the prothorax, the punctures not very coarse but 
deep and strong, rather close-set, the series indistinct and extending 
only slightly behind the middle; abdomen slightly narrower than the 
elytra, parallel, straight at the sides, minutely and very densely punctu- 
late. Male unknown; female with the sixth ventral broadly subangulate 
at tip, the angle obtusely rounded. Length 4.7 mm.; width 0.88 mm. 
Texas (Galveston) ...+sccssocecccccecceccosccvesccosce MI PFICANS D. Sp. 
Body rather more slender and elongate, shining with the abdomen densely 
dull, pale rufo-testaceous in color, the head black, the elytra black but 
rufo-piceous narrowly along the suture and broadly toward base, the 
abdomen infuscate; legs and antennae pale; head as long as wide, the 
sides behind the eyes very feebly converging and straight to the obtuse 
