North American Species of Trogophloeus. 363 



almost evenly coarctate to the apex, moderately convergent and nearly 

 straight toward base; the latter feebly arcuate, less than three-fourths 

 -as wide as the disk, very much narrower than the apex; the latter 

 broadly arcuate; apical angles obtuse, but scarcely rounded; disk with the 

 feeblest possible trace of two broad longitudinal impressions, feebly 

 convex, finely, densely, and strongly granulate, coarsely, very feebly, 

 densely, and indistinctly punctate, the punctures slightly separated. 

 Elytra quadrate, slightly wider and two-tifths longer than the pro- 

 thorax, feebly impressed near the suture, which is narrowly but strongly 

 elevated, moderately coarsely, subasperately punctate, the punctures 

 separated by nearly twice their widths; interspaces not granulose, 

 shining. Abdomen slightly wider behind, at base distinctly narrower 

 than the elytra; sides almost straight; border thick and shallow; seg- 

 ments transversely and rather more than usually impressed at base; 

 surface finely, rather strongly reticulo-granulose, feebly shining, mi- 

 nutely, sparsely, and not distinctly punctate. Legs somewhat robust. 

 Length (strongly extended) 3.8 mm. 



Missouri 1. 



The granules of the pronotum are very strong, fine, and dense, 

 giving an absolutely dull surface on which the punctures are 

 very indistinct; these under sufficient power are seen to be merely 

 small circular areolae, very shallow and with the bottom smooth 

 and shining. 



42 T. ingens n. sp. — Moderately slender, linear, black; legs dark 

 rufous; antennae fuscous, rufous at base; pubescence short, coarse, 

 moderately dense; integuments dull. Head about four-fifths as wide as 

 the prothorax, not very convex, coarsely and very densely punctate; 

 prominences large, moderate in elevation; eyes small but rather con- 

 vex, slightly prominent; tempora fully as long, rather strongly rounded 

 and almost as prominent as the eye; antennae slightly longer than the 

 head and prothorax, rather robust and moderately incrassate, all the 

 joints longer than wide; two to four uniformly and very gradually de- 

 creasing in length. Prothorax widest at anterior third, about one-fifth 

 wider than long; sides anteriorly rather strongly, evenly rounded and 

 coarctate to the apex, rather strongly convergent and straight to the 

 base, which is feebly arcuate, scarcely three-fourths as wide as the disk, 

 and much narrower than the apex; the latter subtruncate; apical 

 angles obtuse, slightly rounded; basal more broadly so; disk not per- 

 ceptibly impressed, rather depressed in the middle, coarsely and ex- 

 tremely densely punctate, the punctures subconfluent. Elytra quad- 

 rate, slightly wider and two-fifths longer than the prothorax; feebly 

 impressed near the suture, coarsely and very densely punctate, the punc- 

 tures equal in size to those of the pronotum, but slightly deeper, some- 



