HARPALIN.E 28 1 



25 Pronotum pale rufo-testaceous in color 26 



Pronotum concolorous, piceous to black 27 



26 Form oblong-oval, rather stout and convex, very shining, piceous- 

 black; head black, the prothorax above and at the sides beneath pale 

 rufous; elytra and under surface otherwise nearly black, the suture 

 and epipleura pallescent; legs pale flavo-testaceous; head short, wider 

 than long, two-thirds as wide as the prothorax; eyes prominent; 

 antennae slender, filiform, not quite half as long as the body, fuscous, 

 the first two joints paler; prothorax transverse, nearly one-half wider 

 than long, subparallel, with almost evenly and strongly rounded sides; 

 apex rather feebly sinuate, with blunt angles and about as wide as 

 the base, the basal angles very broadly rounded; surface very evenly 

 and moderately convex, with extremely fine stria, the foveae small, 

 obsolescent and impunctate; reflexed margin extremely fine; elytra 

 two-fifths longer than wide and nearly two-fifths wider than the 

 prothorax, parallel, with rather strongly arcuate sides and broadly, 

 subcircularly rounded apex, the sinus obsolete; stria? very fine, the 

 scutellar moderately long; intervals flat or nearly so, the discal 

 puncture at apical fourth to fifth; hind tarsi slender, moderately 

 long, the first and fifth joints equal; male with the anterior and 

 middle tarsi subequally but only feebly dilated. Length (cf 9 ) 3-~ 

 3.75 mm.; width 1.2-1.75 mm. Rhode Island to California (Hum- 

 boldt Co.) Very abundant. [Trechus conjunct us Say; Acupalpus 



misellus Dej. and Ac. rotundicollis Hald.] conjunctus Say 



Form and coloration nearly similar, but with shorter prothorax and longer 

 elytra, shining; head distinctly smaller than in conjunctus, three- 

 fifths as wide as the prothorax, with rather large but only moderately 

 prominent eyes; antennae slender though rather short, much less 

 than half as long as the body; prothorax nearly three-fifths wider than 

 long, otherwise nearly as in conjunctus, the sides similarly strongly 

 rounded and the basal angles very broadly; elytra much longer, 

 about one-half longer than wide, a fourth wider than the prothorax 

 and fully three times as long, parallel, with broadly arcuate sides, 

 the apex more broadly and less circularly obtuse than in the pre- 

 ceding, with vestigial sinus; striae nearly similar, those on the flanks 

 extremely fine and feeble; discal puncture less posterior, at about 

 apical fourth; male with the anterior tarsi rather feebly, the inter- 

 mediate very feebly dilated, the difference more marked than in 

 conjunctus. Length (c? 9 ) 3-3-3-7 mm.; width 1.25-1.5 mm. 



Colorado (Boulder Co.). Four examples captiosus n. sp. 



Form and coloration somewhat as in conjunctus but smaller and with 

 paler tints; head rufo-piceous; prothorax clear rufous; elytra blackish- 

 piceous, broadly testaceous toward the sides and along the suture; 

 under surface of the hind body piceous-black, the epipleura and legs 

 very pale; head smaller than in conjunctus, three-fifths as wide as 

 the prothorax, with smaller and less prominent eyes; antennae very 

 slender, almost one-half as long as the body, fuscous, the two basal 

 joints pale; prothorax as in conjunctus but shorter, one-half or more 

 wider than long and more strongly rounded at the sides; elytra 

 rather less than one-half longer than wide, somewhat more arcuate 



