II. C FALL. 123 



Less elongate, elytra 13 times as long as wide, third interval a little convex, 

 fifth and following intervals distinctly convex, the fifth and seventh 



more conspicuously so Slispectus. 



Form less elongate; thorax transverse, its front angles not lobed ; elytra ob- 

 tusely rounded at the apex, intervals 3-5-7 strongly costate. 



desertus. 



1. Elytra] intervals each with a series of moderately long, stiff, erect hairs. 



hirtuN. 



Body entirely glabrous 2. 



2. Prothorax broad, widest near the middle, sides rather strongly rounded 7. 



Prothorax narrower, widest near the front angles (except crenatus) ; elytra not 



carinate, or with at most the seventh interval acutely elevated 3. 



3. Metasternum and first ventral segment impunctate or virtually so 6. 



Metasteruum and first ventral segment distinctly punctate or marked with 



longitudinal rugae, or both 4. 



4. Punctures of elytral series very coarse, rounded, everywhere wider than the 



intervals 5. 



Punctures of elytral series less coarse, the intervals distinctly wider than the 

 punctures, at least toward the suture; size larger. 



Prothorax slightly transverse, the anterior angles lobed, sides parallel behind 

 the angles; black, legs and antennas more or less brownish. 



nigritns. 



Prothorax more strongly transverse, front angles not lobed, sides feebly con- 

 vergent posteriorly; elytral intervals nearly equal and slightly con- 

 vex ; color usually black, legs and antenna? brownish, . i-oiisimilis. 



Prothorax larger, transverse, front angles lobed, sides distinctly convergent 

 posteriorly; elytral intervals alternately a little more convex, at least 

 toward the sides; color usually brown, but occasionally blackish or 

 entirely testaceous mill it I us. 



5. Size small (1.25 mm.), elytral intervals nearly flat on the disk, a little convex 



toward the margins crenatus. 



6. Rufotestaceous : prothorax not distinctly wider than the head, its sides nearly 



straight and subparallel ; seventh interval of the elytra acutely cari- 

 nate from base to apex heviveiitri*. 



7. Intervals 3-5-7 of the elytra acutely carinate strenuus. 



Subgenus EMICMUS Thorn. 



Antennal club abruptly formed, the ninth joint transverse, nearly or quite twice 

 as wide as the eighth, and but little narrower than the eleventh- • • .1. 

 Antennal club much more gradually formed, the ninth joint elongate-obconic, 

 scarcely wider at the base than the eighth, and usually decidedly nar- 

 rower than the eleventh 2. 



1. Metasternum and first ventral segment punctate, the former without post- 

 coxal foveas. 

 Black, varying to ferruginous; surface opaque (except in var. nitens); series 



of elytral punctures equidistant aterrimus. 



Black, opaque; elytral series approximated by pairs duplies) I us. 



Elytra testaceous, with black markings Iliaculal II*. 



TRANS. AM. ENT. SOC. XXVI. NOVEMBER, 1899. 



