BEMBIDIINJE 73 



fifths wider than the prothorax, gradually ogival behind, the striae 

 coarse and deeply impressed, rapidly obsolete near apical fifth, the 

 seventh obsolete; sixth stria barely extending to the middle; punc- 

 tures coarse and deep, rather close; foveae before basal and behind 

 apical third, the anterior almost confounded with the strial punctures. 

 Length (cf 9 ) 6.2-7.0 mm.; width 2.35-2.6 mm. Pennsylvania 



and Illinois postremum Say 



Prothorax relatively smaller, not so convex or inflated and less strongly 



narrowed at base; size much smaller; western regions 52 



52 Thoracic base subequal in width to the apex. Body oblong, very 

 moderately convex, polished, black, with slight metallic lustre, the 

 elytra obscure castaneous, the posterior bioblique fascia rather nubi- 

 lous; under surface black, the legs pale; head four-fifths as wide as 

 the prothorax and almost as wide as an elytron; antennae blackish, 

 the basal joint pale, the medial joints slightly obconic, nearly three 

 times as long as wide; prothorax three-sevenths wider than long, the 

 sides evenly and rather strongly rounded, rapidly becoming parallel 

 in about basal fifth, the angles right; surface smooth, feebly depressed 

 fend slightly rugose at base, the anterior angulate impression fine 

 and shallow; stria fine, subentire; foveae rather large and rounded, 

 very deeply impressed, the carina nearly as long as the fovea and 

 distinct; elytra three-fifths longer than wide and about one-half 

 wider than the prothorax, gradually parabolic behind, the sides 

 feebly arcuate, rapidly rounding at the humeri; striae moderate, only 

 feebly impressed, disappearing very near the apex or subentire, the 

 seventh wanting; punctures distinct basally, gradually fine behind, 

 obsolete near apical third ; foveae near basal and apical third. Length 

 (cf 9 ) 4.6-5.0 mm.; width 1.75-2.0 mm. British Columbia (Vic- 

 toria), YVickham Vancouver! n. sp. 



Thoracic base more or less evidently narrower than the apex 53 



53 Seventh stria wholly wanting. ., 54 



Seventh stria visible as a row of more or less minute punctures 55 



54 Body stouter, rather convex, polished black, with feeble metallic 

 lustre, the posterior pale fascia distinct, though more or less nubi- 

 lously defined; under surface black, the legs bright rufous; head 

 well developed, with prominent eyes, usually over four-fifths as 

 wide as the prothorax and very nearly as wide as an elytron; sulci 

 rather distant from the eyes; antennae not very slender, blackish, 

 with rufous basal joint, two-thirds as long as the elytra, the medial 

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

 fifths to nearly one-half wider than long, the strongly rounded sides 

 becoming rather abruptly parallel in basal sixth to fifth, the angles 

 right; surface smooth, not punctured at base, with more or less 

 feeble impressions and fine incomplete stria; foveae very deep, lin- 

 early impressed, sometimes punctulate, longer than the carina, which 

 is distinct; elytra scarcely more than one-half longer than wide, 

 about one-half wider than the prothorax, parallel, with broadly 

 arcuate sides, the striae gradually disappearing near the apex, only 

 feebly impressed, the punctures distinct though not very coarse, the 

 foveas near basal and behind apical third. Length (cf 9 ) 5.0-5.8 



