116 AMERTCAN COLEOPTERA 



L,ATIIKIDIUS Herbst. 



Body nearly or quite glabrous (except productus), shining, casta 

 neous or brown. Head about as wide as long, rugosely punctate 

 and canaliculate; epistoma depressed in arc and on a lower plane 

 than the front, labrum broadly rounded ; eyes moderate in size, very 

 prominent; tempera subparallel and one-half to three-fourths as 

 long as the eye^; antennae proportioned us usual, club not very 

 abruptly formed, usually 3-jointed, 2-jointed in brevielavus. Pro 

 thorax as long or a little longer than wide, front angles more or less 

 lobed, sides sinuately convergent to a point near or a little beyond 

 the middle, thence divergent to base; disk longitudinally bicostate. 

 Elytra fully twice as wide as the prothorax, broadly ovate, apex 

 somewhat pointed; strongly punctate-striate, impressed behind the 

 base, at the middle of the seventh stria and as usual on the suture 

 at the apical fourth. Under surface nearly or quite impunctate 

 throughout. Presternum excavate before each coxa and with the 

 sides deeply transversely impressed, both before and behind; the 

 intercoxal process extending a short but slightly variable distance 

 behind the coxae, beyond which the epimera are coalescent on the 

 median line. Metasternum with deep post-coxal fovese, from which 

 radiate short rugae, which are much less developed than in many 

 species of Enicmus. Middle cox* separated by their own width or 

 more. Abdomen with five segments in both sexes, the first as long 

 as the next two together, the last four subequal. First joint of 

 tarsi distinctly shorter than the second. As in the case of the Euro- 

 pean species, sexual characters are present in some of our species, 

 but entirely lacking in others. 



The forms which appear worthy of specific standing in the mate- 

 rial before me are thus separable: 



Elytra with a scries of erect hairs on each interspace producing. 



Elytra entirely glabrous, or with the hairs very tine, short and inconspicuous. 



Elytra rather strongly produced at tip ; size large lardai ius. 



Elytra riot or scarcely produced at tip. 



Antennal cluh 2-jointed ; prothorax scarcely narrower at middle, the sides 

 nearly parallel behind the broadly prominent front angles. 



brevielavus. 



Antennal cluh 3-jointed ; prothorax more or less narrowed at middle. 



Tempora very long, H to f the length of the eye; seventh elytra! interval 



not carinate in basal half, at most a little more convex. 



Males with the front and middle tibia- slightly bent at the tip, and with 



a minute tooth on the inner side near the apex ; anterior femora with 



a short spine close to the trochanters ai-iual ulus. 



