194 MEMOIRS ON THE COLEOPTERA 



piceous and shining, deep black above; head rather narrowly and 

 deeply impressed transversely, somewhat strongly punctate, 

 closely so anteriorly; antennae slender; prothorax scarcely three- 

 fifths wider than long, the apex more than two-thirds as wide 

 as the base, deeply sinuate, the angles acute and very sharp, not 

 at all blunt; sides evenly and rather strongly arcuate, the con- 

 verging sides anteriorly straight; surface nearly as in polita but 

 duller, the concave side margins more shallow and more punctate, 

 the edge rather thin throughout; scutellum wider than long; 

 elytra one-half longer than wide, less than a fifth wider than the 

 prothorax, less rapidly narrowed at apex than in subopaca and 

 with the more acute apical lobe still less differentiated, widest at 

 the middle, the sides parallel and evenly, rather feebly arcuate 

 to the base, the lateral edges subacute nearly to apical fourth, 

 the humeral reflexed margin thinner than in subopaca; surface much 

 more convex throughout the width, opaque, very minutely and 

 reticularly creased in small denser and sparser patches, the punc- 

 tures larger than in polita but more feebly impressed; each elytron 

 with traces of three very feeble costules, the inner rather distinct, 

 posteriorly uniting with the second on the declivity and the 

 common line thus formed indicating union with the end of the 

 third costule, which however is not traceable at any other point; 

 abdomen nearly smooth, polished, punctate apically; tarsi very 

 slender, the legs picescent. Length (cf) 12.0 mm.; width 5.75 



mm. Kansas (Wallace Co.), Warren Knaus futilis n. subsp. 



4 Form stout, convex, oblong, deep black throughout; head shining, 

 broadly and feebly impressed transversely, rather strongly, moder- 

 ately closely punctate; prothorax one-half wider than long, the 

 sides rounded at the middle, thence converging and but feebly arcuate 

 apically and just visibly converging and nearly straight basally, 

 the basal angles right and .narrowly rounded, the apical moderately 

 acute; surface shining, convex, minutely, sparsely punctulate, the 

 marginal concavity narrower apically than basally, sparsely and 

 more distinctly punctate, the edge reflexed, notably thick, densely 

 and strongly punctate; median line very feebly impressed toward 

 base; elytra about a third longer than wide, nearly a fourth wider 

 than the prothorax, very obtuse behind, the small apical lobe short 

 but distinct; sides parallel and evenly arcuate; surface strongly 

 convex, but feebly shining, densely rugose and with rather close-set 

 punctures, which are larger than usual; abdomen shining, smooth, 

 very minutely punctulate, gradually more closely and strongly so 

 posteriorly. Length (cf) 13.8 mm.; width 7.0 mm. Wyoming 

 (Saratoga) dolosa n. sp. 



The three vestigial costules sometimes traceable and described 

 in more detail under futilis, by their number and arrangement, the 

 outer joining the side margin near the base, indicate a certain con- 

 sanguinity between this genus and Trichiasida, a fact, however, 

 that might be inferred as well from their general morphology. 



