DYNASTIN^E 163 



abbreviated and the sculpture throughout is finer and feebler, the 

 pygidium being almost sculptureless and highly polished. The 

 ligular part of the mentum is moderately constricted and generally 

 slightly concave, but the apex is broadly arcuato-truncate. The 

 mandibles are slender, truncate and sometimes externally prominent 

 at tip, the antennal club small in both sexes and the larger anterior 

 claw of the male is long, stout, cleft at apex, the slender upper 

 ramus extending as far as the lower. The three species at hand, 

 which are all peculiar to the tropical regions of Mexico, may be 

 known as follows: 



Base of the pronotum with a distinct marginal bead, interrupted medially. 

 Body very elongate-oval, convex, polished throughout, blackish- 

 castaneous, the head and clypeus deep black, the elytra pale yellow- 

 ish-brown, wholly immaculate; head (cf ) small, two-fifths as wide as 

 the prothorax, very finely, sparsely punctate, the surface continu- 

 ously flat throughout the front and clypeus, the latter large, less 

 than one-half wider than long, finely and very shallowly, irregularly 

 but discretely punctulate, the sides converging very slightly from 

 base to the broadly rounded angles and with a fine elevated bead, 

 the apex broadly arcuate, slightly thickened and gradually very 

 moderately reflexed; suture fine, obliterated medially; eyes moder- 

 ate, the antennal club small, oval; prothorax one-half wider than 

 long, feebly trapezoidal, the sides evenly and moderately converging; 

 from the rather broadly rounded angles to the apex and evenly,, 

 rather feebly arcuate; apical angles sharp and prominent; punctures 

 very sparse throughout, fine medially, slightly more distinct toward 

 the sides; scutellum flat, sharply ogival, minutely and remotely 

 punctulate; elytra about one-half longer than wide, rounding behind 

 about the middle, barely visibly wider than the prothorax, sparsely, 

 very finely and feebly punctulate, the punctures for the most part 

 in rather irregular series; pygidium very convex, polished and almost 

 sculptureless, finely scabriculate near the side angles, glabrous, the 

 lower margins not sinuate; punctures of the abdominal series very 

 fine and feeble; hind tarsi missing in the type, the intermediate 

 slightly longer than the tibiae; claw-joint of the anterior almost as 

 long as the others combined. Length (c?) 16.0 mm.; width 8.0 mm. 



Mexico (locality unknown) *divisa n. sp. 



Base of the pronotum completely immarginate 2 



2 Form more broadly elongate-oval, convex, polished throughout; 

 color of the entire body and legs dark and rich red-brown, the 

 elytra alone pale brownish-flavate, wholly glabrous, the sternal ves- 

 titure rather sparse but evident; head (9) scarcely two-fifths as 

 wide as the prothorax, dark castaneous, blackish basally, minutely, 

 sparsely punctulate, the median parts of the front sculptureless; 

 clypeus shorter, fully two-thirds wider than long, strongly trape- 

 zoidal, the converging sides with fine elevated bead, the angles and 



