REVISION OF TENEBRIONID SUBFAMILY CONIONTIN^ 63 



sentatives of this genus thus far discovered. While allied more 

 closely to Discodemus than to any other, it differs markedly in 

 antennal structure, the antennae being notably slender basally 

 and decidedly dilated distally, in the form of the lateral margins 

 of the elytra, which are not evenly acute but acutely rounded 

 in section, sculptured and uneven and not smoothly cariniform 

 and in the more parallel and oblong form of the body, with the 

 prothorax not widest at base as in Discodemus but slightly 

 behind the middle. It also inhabits a very different faunal 

 region, which amply accounts for the present structural diver- 

 gencies, though apparently springing from the same archetype 

 at no very distant time in the geologic past, as indeed did all 

 these allies of Eusatttis. The species may be defined as 

 follows : — 



Form oblong, strongly convex, deep black, glabrous, the head evidently 

 and the prothorax very feebly alutaceous in lustre, the elytra 

 polished except in the erosions, the latter being opaque ; head 

 rather strongly, moderately closely punctate, the anterior margin 

 slightly reflexed, moderately sinuate at the middle and feebly 

 emarginate laterally; antennae a little longer than the prothorax, 

 the third joint much the longest, the tenth obtrapezoidal, slightly 

 transverse, broadly angulate at tip, the eleventh as wide as the 

 tenth and longer, acutely angulate ; prothorax two and one-half 

 times as wide as its median length, the deep apical sinus trans- 

 verse medially, the angles prominent but rounded, the basal 

 angles rather abruptly but only moderately produced posteriorly, 

 acute, the lateral sinuses of the base deep, relatively small, the 

 median lobe very broad; sides evenly rounded, strongly, moder- 

 ately thickly beaded, narrowly explanate ; punctures fine and 

 sparse, becoming rather close, larger and muricatulate laterally; 

 elytra decidedly longer than wide, obtusely ogival behind, feebly 

 dilated, the sides slightly arcuate, each with two distinct obtuse 

 ridges, the intermediate ridges very feeble, the surface pitted with 

 numerous small deep irregular and isolated erosions, with their 

 anterior margins rendered very rough and jagged by the rather 

 strong and very asperate, minutely setigerous punctures, the 

 flanks just above the acute side margins more deeply and con- 

 tinuously eroded and opaque, with the included punctures less 

 asperate ; inflexed sides asperately punctate ; prosternal lobe 

 dilated and spatulate apically, laterally margined only along the 

 coxas ; anterior tibiae with the external apical projection very 

 acute. Length 19.0 mm.; width 11. 5 mm. Lower California. 



erosus Horn 



Form rounded-oval, convex, black, subopaque, the prothoi-ax finely and 

 sparsely punctured medially and densely though very faintly 



