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 ainhigua Lee, 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 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 3 



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 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) ...nigricans n. 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 iufuscate; legs and antennae pale; head as long as wide, the 

 sides behind the eyes very feebly converging and straight to the obtuse 



