52 MEMOIRS ON THE COLEOPTERA 



black, the under surface ferruginous; pronotum feebly and broadly 

 picescent toward the sides; head moderate, about half as wide as the 

 prothorax, minutely punctulate, the antennae of the usual form, the 

 joints of the club gradually increasing in width; prothorax trans- 

 verse, with arcuate converging sides, about two-fifths as long as the 

 elytra; scutellum as in the preceding; elytra only slightly longer 

 than wide, rather rapidly rounding at the sides behind the middle, 

 the combined apex notably obtuse; punctures of the series very fine 

 though more distinct than in callidus, especially toward the sides. 

 Length 1.7-2.0 mm.; width 0.9-1.15 mm. Colorado (Fort Collins 

 and Boulder Co.) and New Mexico (Jemez Springs) . .collucens n. sp. 



Form rather narrowly oval, not so elongate as in callidus but more so than 

 in collucens, black, the elytra rarely each with a nubilous and gradu- 

 ally disappearing discat spot of red behind the middle; under surface 

 ferruginous, the legs more yellow; head rather more than half as 

 wide as the prothorax, minutely punctulate; antennae normal, except 

 that the club is more parallel than usual, the joints increasing only 

 very slowly in width; prothorax transverse, with strongly arcuate 

 converging sides, between a third and two-fifths as long as the elytra; 

 scutellum sharply ogival; elytra distinctly longer than wide, the 

 outline obtusely parabolic, the sides becoming parallel only near the 

 base; punctures of the series very minute throughout. Length 

 1.65-2.3 mm.; width 0.78-1.3 mm. Arizona (near the Grand Canon 

 of the Colorado), Prudden. Thirty-six examples, of which only 

 some seven or eight exhibit any signs of the nubilous red spot behind 

 the middle, this being small and barely distinguishable in some, to 

 large and conspicuous in others voraginalis n. sp. 



16 Elytra smooth, feebly reticulate at the extreme apex, without minute 

 scratches at any part. Body broadly oval, very obtuse at apex, 

 pale piceous-brown in color, ferruginous beneath, the legs more 

 yellow; head not quite half as wide as the prothorax. sparsely and 

 very minutely punctulate, the antennae as usual; prothorax much 

 more than twice as wide as long, the sides rather strongly converging 

 and feebly arcuate, the basal bead distinct; scutellum but slightly 

 transverse, ogival; elytra slightly longer than wide, parabolic in the 

 male, more obtuse in the female, the two striae subequal, much ab- 

 breviated basally, the punctures of the series everywhere minute 

 points; metasternal process broad, finely beaded, the prosternal 

 generally finely beaded at the sides and broadly at apex. Length 

 1.9-2.2 mm.; width 1.2-1.3 mm. British Columbia (locality un- 

 recorded). Three examples tritus n. sp. 



Elytra having minute longitudinal scratches posteriorly and especially 

 on the flanks. Body more narrowly ovulate, somewhat narrowed 

 behind, the sides strongly arcuate; color black, sometimes with 

 piceous tinge, the under surface infuscate, with pale brownish- 

 testaceous legs; head half as wide as the prothorax, finely impresso- 

 punctate; antennae of normal form; prothorax short, much more than 

 twice as wide as long, the strongly converging sides feebly arcuate, 

 the basal bead distinct; elytra evidently but not greatly longer than 

 wide, parabolic in outline, nearly three times as long as the prothorax, 



