336 A Preliminary Monograph of the 



feebly incrassate, but very slightly longer than the head and prothorax^ 

 all the joints longer than wide, the tenth slightly so. Prothorax two- 

 fifths wider than long, widest just before anterior two-fifths, where the 

 sides are obtusely subangulate, the angle narrowly, though distinctly 

 rounded, thence moderately convergent and very feebly arcuate to the 

 advanced, acute, and prominent apical angles, slightly more strongly 

 convergent, and scarcely perceptibly sinuate to the basal angles, which 

 are slightly rounded; base feebly arcuate, nearly three-fourths as wide 

 as the disk, much narrower than the apex; the latter broadly, feebly 

 emarginate, the bottom broadly arcuate and very feebly narrowly^ 

 translucent along the edge; disk strongly bi-impressed; the impressions 

 parallel and strongly constricted; surface finely, deeply, and very 

 densely punctate, the punctures separated by their own widths and 

 abruptly large, scabrous, variolate, and polygonally crowded very near 

 the lateral edges, where also the surface is dull. Elytra quadrate, 

 one-fourth wider and two-thirds longer than the prothorax, feebly im- 

 pressed near the suture, densely punctate, the punctures moderate, 

 separated by scarcely their own widths. Abdomen parallel, narrower 

 than the elytra and scarcely wuder than the prothorax ; sides nearly 

 straight; border moderate; surface minutely, densely punctate. Legs 

 moderate. Length 2.7 mm. 



Arizona (Tugson 3). 



Also resembles armatus, but has a shorter prothorax, with 

 the side angles distinct but narrowly rounded, the surface more 

 densely punctate, the punctures very much deeper and denser, 

 and the surface more alutaceous than m prominens, 



10 T. proiiiinen§ n. sp.— Moderately slender, parallel, rather de- 

 pressed, piceous-black; legs pale brownish-flavate; antennae pale fus- 

 cous; pubescence dense, moderate in length; integuments shining. 

 Head distinctly narrower than the prothorax, shining, feebly convex, 

 minutely and not very densely punctate; prominences elongate, strong; 

 eyes large, convex, rather prominent; tempora less than one-half as 

 long, angulate behind, not prominent; antennae slender, very feebly in- 

 crassate, about as long as the head and prothorax; joints two to four 

 decreasing uniformly and very gradually, elongate, tenth fully as long 

 as wide. Prothorax widest at anterior two-fifths, where the sides are 

 obtusely angulate, the angle not distinctly rounded, thence almost 

 equally and rather strongly convergent to apex and base, just per- 

 ceptibly arcuate in the former, and just as feebly sinuate in the latter; 

 base feebly arcuate, nearly three-fourths as wide as the disk, much 

 narrower than the apex; the latter broadly, feebly emarginate between 

 the advanced, acute, and prominent anterior angles, the bottom of the 

 emargination broadly arcuate, the edge not at all coriaceous; disk two- 

 fifths wider than long, with two rather narrow, strong median im- 



