North America 71 Species of Trogopliloeus. 371 



arcuate ; apical angles narrowly, basal broadly, rounded ; disk nearly 

 one-fourth wider than long, broadly, evenly convex, witliout impres- 

 sions but with a feebly tumid, impunctate and rather broad line, ex- 

 tending from near the base slightly beyond the middle, remainder 

 minutely, very densely punctate. Elytra quadrate, one-third wider and 

 one-half longer than the prothorax, rather convex, feebly impressed 

 near the suture toward base, rather finely and densely punctate ; the 

 punctures nearly three times as large and twice as distant as those of 

 the pronotum. Abdomen distinctly narrower than the elytra, parallel ; 

 sides very feebly arcuate; border moderate, shallow ; surface shining, 

 finely reticulate, minutely and rather densely punctate. Legs slender. 

 Length 2.0 mm. 



California (Fort Yuma 1). 



This species is of a rather uncommon type in this part of the 

 genus, and may be distinguished by the form of the prothorax 

 and its very large, prominent eyes. It is somewhat allied to 

 confinis. 



The two following species are more slender, parallel, and con- 

 vex, with the pronotum perfectly devoid of any trace of im- 

 pression. 



49 T. Iang^uidu§ n. sp. — Slender, linear, moderately convex, piceous- 

 black; legs rather dark brown; antennae piceous throughout; pubescence 

 minute, moderately dense; integuments rather shining. Head \eYj 

 slightly narrower than the prothorax, feebly convex, minutely, very 

 densely punctate and subgranulose; prominences rather large and 

 strong; eyes moderate, convex, and slightly prominent; antennae slightly 

 robust, very short, moderately incrassate, much shorter than the head 

 and prothorax, outer joints rather strongly transverse; joints two to 

 four decreasing very rapidly in length, the latter scarcely as long as 

 wide. Prothorax one-fifth wider than long; sides convergent from 

 apex to base, broadly and nearly evenly arcuate; base feebly arcuate, 

 about four-fifths as wide as the apex; the latter very feebly arcuate; 

 apical angles slightly obtuse and rounded; disk not impressed, evenly 

 convex, finely, densely punctate; the punctures slightly sparser near 

 the middle, where they are separated by slightly more than their own 

 widths, and where there is a rather wide, slightly tumid, impunctate 

 line, extending from the base to the apex, becoming wider anteriorly; 

 two setigerous punctures feeble. Elytra quadrate, very slightly wider 

 and nearly one-third longer than the prothorax, distinctly impressed 

 near the suture toward base, somewhat finely, not very densely and 

 rather feebly punctate. Abdomen very slightly narrower than th& 

 elytra, moderate in length, parallel; sides nearly straight ; border mode- 



