BEMBIDIINJE 21 



little less in the male. Black, polished, the legs rufous; antennae 

 deep black, thick, much shorter than the elytra, the medial joints 

 distinctly less than twice as long as wide; palpi black; head well de- 

 veloped, three-fourths as wide as the prothorax, the latter nearly 

 one-half wider than long, just visibly wider at base than apex, 

 widest before the middle, the sides moderately oblique posteriorly; 

 stria distinct, subentire, the transverse subbasal impression sub- 

 obsolete medially, with small scattered punctures, the foveae large 

 and deep; side margins narrowly reflexed; elytra oblong-oval, rather 

 less than one-half longer than wide, the sutural stria deep, the others 

 finer, diminishing outwardly; dorsal foveae before one-third and at 

 three-fifths. Length (cf 9 ) 3-2-3-5 mm.; width 1.25-1.4 mm. 

 California (Arcata and Hoopa Valley, Humboldt Co.). 



serenum n. sp. 



Hind body less inflated, not more than about a third wider than the pro- 

 thorax 



8 Antennae less thick than usual and more elongate, the medial joints 

 fully twice as long as wide. Body oblong-oval, moderately convex, 

 highly polished, black, sometimes with slight aeneous lustre; legs 

 piceous-black; antennae black, only slightly shorter than the elytra 

 (d"), or distinctly (9); head moderate in size, fully two-thirds as 

 wide as the prothorax, which is not quite one-half wider than long, 

 nearly as in the preceding, the basal angles more than right but very 

 sharp, not at all prominent; elytra not quite one-half longer than 

 wide, oblong, not very obtusely rounded behind, the striae very fine 

 and shallow internally, obsolete externally, the sutural not deeper 

 than the second. Length (i cf, 4 9) 3.6-3.8 mm.; width 1.35- 

 1.55 mm. California (Truckee and Lake Tahoe).. . .lascivum n. sp. 



Antennae decidedly thick, the medial joints generally less than twice as 

 long as wide 9 



9 Head small, distinctly narrower than an elytron; color and lustre 

 nearly as in the preceding throughout; body shorter, relatively 

 broader and smaller in size; antennae two-thirds as long as the ely- 

 tra; head scarcely two-thirds as wide as the prothorax, the latter 

 short and transverse, fully one-half wider than long, the base slightly 

 wider than the apex, as usual in this section, its general conforma- 

 tion and the deep basal foveae as in the preceding; elytra two-fifths 

 to nearly one-half longer than wide, oblong-oval, subcircularly 

 rounded behind, the striation as in lascivum, the small dorsal foveae 

 before basal third and at two-thirds. Length (c? 9 ) 3--3-4 mm -: 

 width 1.3-1.45 mm. California (Truckee and Lake Tahoe). Thir- 

 teen examples, indicating scarcely any variability.. . .lubricum n. sp. 



Head similarly small, the body rather convex, similar in color and in the 

 very polished lustre throughout; head fully three-fourths as wide 

 as the prothorax, with deep narrow sulci and moderate eyes; an- 

 tennae thick, filiform, two-thirds as long as the elytra; prothorax 

 rather more than one-half wider than long, the base and apex equal, 

 widest before the middle and with distinctly and evenly rounded 

 sides, oblique and feebly sinuate basally; stria ending at the feeble 

 anterior impression and lost in the scattered punctures of the base; 



