BEMBIDIIN/E 53 



wider than long, parallel, the sides feebly arcuate, slightly oblique 

 behind and just visibly sinuate toward the angles, which are sharp 

 and but little more than right; surface smooth, minutely, feebly 

 punctulate at base, with incomplete stria, very feeble anterior and 

 marked posterior impression, the foveae shallow, rather finely linear, 

 outside of lateral fourth, the carina fine and feeble; elytra parallel, 

 with feebly arcuate sides, broadly rounding basally, subcircularly 

 rounded at apex, three-fifths longer than wide and nearly one-half 

 wider than the prothorax, the striae well impressed, rather coarse 

 but with small punctures, which become gradually obsolescent be- 

 hind the middle; foveae distinct, at three-sevenths and three-fourths. 

 Length (cf 9 ) 3-4~4-4 mm.; width 1.2-1.5 rnm. California (St. 

 Helena and Sta. Rosa). Thirteen specimens. . tetragonoderum Chd. 



Strial punctures larger and more distinct 13 



13 Upper surface depressed, the striae feebly impressed and with punc- 

 tures but little larger than in the preceding. Body shorter than in 

 tetragonoderum, similarly deep black throughout, the head similar 

 but relatively somewhat larger; antennae slender, relatively longer, 

 being but little shorter than the elytra, the medial joints about three 

 times as long as wide; prothorax shorter, two-fifths wider than long, 

 the sides more strongly rounded anteriorly, somewhat more oblique 

 and broadly, just visibly sinuate in about basal half, the angles 

 similar; surface nearly similar but with the posterior impression 

 feebler, the punctulate foveae broadly sublinear and very shallow, 

 the carina fine and very feeble; elytra much shorter, fully one-half 

 longer than wide, two-fifths wider than the prothorax, parallel, with 

 straighter sides, more rapidly rounded at the humeri, obtusely, cir- 

 cularly rounded at apex; punctures gradually obsolescent behind 

 the middle; foveae at two-fifths and three-fourths. Length (cf ) 3.4 

 mm.; width 1.3 mm. Nevada (Reno) avidum n. sp. 



Upper surface distinctly convex, the striae more or less deeply impressed, 

 the punctures stronger and more widely separated in the series ... 14 



14 Body narrower and elongate-suboval, shining and deep black 

 throughout, the upper surface feebly subaeneous; legs black; head 

 moderate, three-fourths as wide as the prothorax but distinctly nar- 

 rower than an elytron; antennae black, three-fourths as long as the 

 elytra, the medial joints not quite three times as long as wide; pro- 

 thorax a third or more wider than long; base evidently wider than 

 the apex; subparallel, the sides broadly arcuate anteriorly,- barely 

 at all converging and broadly, just visibly sinuate posteriorly, the 

 angles nearly right and very sharp; surface smooth, with fine abbre- 

 viated stria and feeble, medially interrupted posterior impression, 

 the foveae smooth, small, obliquely sublinear and deep, the carina 

 very feeble, short and almost obsolete; elytra four-sevenths longer 

 than wide, nearly one-half wider than the prothorax, parallel, the 

 sides more rapidly rounding at base than in tetragonoderum, subsim- 

 ilar at apex, the punctures obsolescent near posterior third; foveae 

 at two-fifths and three-fourths. Length (cf 9 ) 3.8-4.0 mm.; width 

 1.4-1.5 mm. Nevada (locality unrecorded). Three specimens. 



pertinax n. sp. 



