BEMBIDIIN^E 49 



der, similar in color, about as long as the elytra, the outer joints 

 not notably shorter than the medial and three times as long as wide 

 or nearly; prothorax much narrower and less transverse, two-fifths 

 wider than long, the sides much more feebly arcuate and subevenly 

 so from apex to just before the angles, where they become very 

 feebly sinuate, the angles right and very sharp; surface nearly simi- 

 lar; elytra shorter, not one-half longer than wide and more sharply 

 ogival in about apical third, two-thirds wider than the prothorax; 

 striae and punctures nearly similar, the former not quite so long. 

 Length (cf) 3.7 mm.; width 1.45 mm. Virginia. . . .morosum n. sp. 



2 Larger species, the prothorax but slightly inflated, the base but little 

 narrower than the maximum width 3 



Smaller and rather more depressed species, the prothorax inflated ante- 

 riorly, with the sides more oblique behind, the base not over four- 

 fifths the maximum width 4 



3 Body elongate, oblong-suboval, rather convex, polished, black, with 

 moderate cupreo-aeneous lustre, the under surface black, the legs 

 piceous-black; head three-fourths as wide as the prothorax, not 

 quite as wide as an elytron, the moderate sulci widely separated, 

 the front feebly convex; antennae black, with piceous basal joint, 

 slender, three-fourths or more as long as the elytra, the medial 

 joints fully three times as long as wide; prothorax scarcely one-half 

 wider than long, the sides feebly arcuate, oblique and broadly, just 

 visibly sinuate in about basal half, the angles scarcely more than 

 right and very sharp; surface with distinct subbasal impression and 

 abbreviated stria, the fovese at outer fifth deep and linear, the carina 

 fine but rather long and distinct; elytra slightly more than one-half 

 longer than wide and about one-half wider than the prothorax, 

 parallel, ogival in apical third; striae scarcely at all impressed, the 

 punctures rather coarse, deep, separated by twice their diameters, 

 closer suturally, gradually extinct in about apical fourth, the striae 

 however faintly visible nearly to the apex; foveae at two-filths and 

 two-thirds. Length (cf 9 ) 3.8-4.5 mm.; width 1.35-1.65 mm. 

 Idaho (Cceur d'Alene), YVickham quadrulum Lee. 



Body broader, deep black, the anterior parts feebly viridate, the elytra 

 senescent; under surface and legs similar; head relatively somewhat 

 narrower, two-thirds as wide as the prothorax; antennae nearly simi- 

 lar; prothorax shorter and much more transverse, three-fifths wider 

 than long, the sides more rounded, not to about the middle but to 

 about basal fourth, where they become distinctly more sinuate, the 

 angles rather more than right but sharp; surface nearly similar, the 

 side margins rather more widely reflexed; elytra not quite one-half 

 longer than wide and two-fifths wider than the prothorax, much 

 more obtusely ogival at tip; striae broadly and deeply impressed, 

 with convex intervals, the coarse punctures more close-set, gradu- 

 ally obsolete at about apical fourth, the striae apically more distinct 

 than in quadrulum, the foveae nearer anterior and posterior third. 

 Length (9) 4.6 mm.; width i.S mm. Idaho (Coeur d'Alene), 



\Vickham tartareum n. sp. 



T. L. Casey, Mem. Col. VIII, Oct. 1918. 



