BEMBIDIIX.E 77 



dently narrower than the apex, the elytra broader, with the parallel 

 sides straighter, the apex more obtusely rounded and the striae 

 and punctures less coarse, the former somewhat less impressed. 

 Length (9) 5.6 mm.; width 2.2 mm. Minnesota (Duluth). A 



single example taken by the writer rupicola Kirby 



B Similar to tetracolum but broader, the prothorax broader, with the 

 apex but little wider than the base, the sides more strongly 

 rounded, more oblique posteriorly and parallel for a shorter dis- 

 tance before the hind angles; elytra castaneous, with the pale 

 areas of tetracolum relatively paler and not nubilously but very 

 sharply defined, the posterior fascia crossing the suture, the parallel 

 sides much less arcuate and more rapidly rounded at the humeri. 

 Length (9) 5.2 mm.; width 2.1 mm. New York (lower Hudson 



Valley) nactum n. subsp. 



59 General habitus and striation of the elytra nearly as in the preceding 



section, the striaa gradually obsolescent or very feeble at the apex. . 60 



General habitus differing somewhat, due to the broader body and the 



elytral striae being deep and very conspicuous to the extreme elytral 



apex 6 1 



60 Body narrow, distinctly depressed, shining, black, with greenish 

 lustre, the elytra uniform pale castaneous, darker and greenish at 

 tip; under surface black, the legs rufous; head well developed, with 

 prominent eyes, about as wide as an elytron, fully four-fifths as 

 wide as the prothorax; antennae rather short, only two-thirds as 

 long as the elytra, piceous-black, with rufous basal joint, the medial 

 joints between two and three times as long as wide; prothorax one- 

 half wider than long, the base barely visibly narrower than the apex; 

 sides well rounded before the middle, straighter apically, oblique 

 and broadly sinuate behind, becoming parallel at the angles, which 

 are right and very sharp; surface with moderate impressions, the 

 stria extending only between them, the foveae shallow, rugulose, ob- 

 liquely sublinear, the carina obsolete; elytra parallel, with nearly 

 straight sides and rapidly rounded humeri, three-fifths longer than 

 wide and one-half wider than the prothorax, the apex circularly 

 rounded; striae moderately coarse, distinctly impressed, all entire, 

 though very fine and feeble at apex; punctures not coarse but close- 

 set; foveae rather small, just before the middle and behind apical 

 third. Length (9 ) 5-O mm.; width 1.75 mm. Massachusetts. The 

 specimen described is marked "type" but is probably a cotype. 



[Bemb. blanchardi Hayw.] rufotinctum Chd. 



Body notably broad, more convex, shining, black, with aeneo-cuprous 

 lustre throughout above, black beneath, the legs obscure rufous, the 

 femora nearly black; head moderate, nearly four-fifths as wide as 

 the prothorax, very much narrower than an elytron; antennas long 

 and slender, three-fourths as long as the elytra, black, the basal 

 joint rufous, with a blackish streak above, the medial joints rather 

 more than three times as long as wide; prothorax one-half wider 

 than long, the sides well rounded just before the middle, oblique 

 and straighter anteriorly, oblique posteriorly, becoming gradually 

 deeply sinuate just before the angles, which are very sharp, acute 



