360 Memoirs on the Coleoptera 



The male type of this species differs from the male of crenatus 

 in its more abbreviated form and more elongate prothorax, this 

 being somewhat shorter than wide and less than half as long as the 

 elytra in crenatus, where the strial punctures are coarser and more 

 widely separated than in arizonicus; it also differs from crenatus in 

 its shorter legs and rather deeper and more acutely defined abdomi- 

 nal impression in the male, as well as in the closer abdominal punc- 

 tures. 



Baridiellus n. gen. 



The body is oblong, convex and clothed not densely with slender 

 squamules, the beak very thick, separated from the head by a 

 transverse depression, the mandibles closely decussate, the antennae 

 rather short, with relatively large, oblong-oval and abrupt club, 

 having its basal joint very large — much more than half the mass. 

 The anterior coxae are separated by about their own width, the 

 prosternum unmodified and flat, the scutellum transversely ovoidal, 

 finely sculptured and somewhat setulose and the elytra each broadly 

 rounded at apex; the pygidium is vertical and closely sculptured. 

 The claws are nearly straight, moderately divergent and are con- 

 nate at base. The type is the following: 



*Baridiellus solidulus n. sp. — Somewhat stout, strongly convex, the 

 elytra somewhat shining; squamules above yellowish, long and slender, 

 almost uniformly distributed, forming single lines on the strial intervals, 

 smaller and sparse beneath; beak in the male thick, cylindric, finely but 

 rather strongly punctured, evenly and feebly arcuate and as long as the 

 head and prothorax, the antennae at four-sevenths; prothorax a third 

 wider than long, the sides parallel, feebly arcuate, rapidly rounding in 

 apical fourth to the tubulate apex, which is nearly three-fifths as wide 

 as the base; punctures rather strong, very close but not confluent, the 

 smooth line wanting; elytra only a fifth longer than wide, at the feebly 

 tumid humeri nearly a fourth wider than the prothorax, very nearly twice 

 as long, the sides but just visibly converging and feebly arcuate to the 

 broadly rounded and very obtuse apex; striae fine but deep and nearly 

 smooth; intervals three or four times as wide as the striae, finely, loosely 

 and confusedly punctate, the abdomen not densely punctulate, not im- 

 pressed in the male, the prosternum unarmed. Length (cf) 1.8 mm.; 

 width 0.83 mm. Mexico (Frontera, in Tabasco). 



The genus Baridiellus probably belongs in the neighborhood of 

 Chrysobaris Chmp., but the elytra are broadly rounded behind 

 and there are other differences, especially in the prosternum. 



