600 Goleopterological Notices, VII. 



and prominent, situated at about their own length from the base. Antennse 

 slender, % as long as the body, the club very gradually formed and moder- 

 ately stout; second joint much smaller than the first, % longer than wide; 

 three to eight equal in thickness and still narrower; third, fifth and sixth 

 almost equal in length and f^, the fourth % and seventh }{, longer than wide; 

 eighth subquadrate but rather longer than wide; ninth feebly obtrapezoidal 

 and nearly }{ longer than wide; tenth as long as wide; eleventh oval, obli- 

 quely acuminate and barely as long as the three preceding. Prothorax but 

 feebly transverse, scarcely more than }£ wider than long, widest just before 

 the middle, where the sides are but moderately prominent and rounded; apex 

 barely % as wide as the base and not quite % ^^^ maximum width ; disk 

 slightly convex, the fovese normal, the median rather small but deep and per- 

 forate. Elytra well developed, a little shorter than wide, the suture a little 

 longer than the humeral width ; sides moderately divergent, broadly arcuate 

 posteriorly; humeral swelling distinct; striae and fovese normal. Abdomen, 

 from above, nearly as wide as the elytra and % as long, the first segment more 

 than three times as wide as long and scarcely }4 as long as the elytra, the 

 carinse straight, strongly divergent, extending to about the middle of the seg- 

 ment and separated at base by obviously more than the strial interspace. Legs 

 moderate, normal in structure. Length 1.6 mm. ; width 0.75 mm. 



Iowa (Iowa City and Keokuk) ; Nebraska ; South Dakota. 



This distinct species is rather abundant in the northwestern 

 parts of the Mississippi Valley and is somewhat above the average 

 in point of size. The male has the last ventral rather large, flat 

 in the middle toward base, the surface ascending toward tip in a 

 flattened depressed plane, the last dorsal distinctly punctulate, 

 with the tip broadly and deeply sinuate between the more nar- 

 rowly rounded limiting angles. 



R. corporalis. — Strongly ventricose and convex, the hind body some- 

 what elongate ; body black, the elytra rufous ; legs and antennae pale testa- 

 ceous ; integuments polished, subimpunctate, the pronotum quite distinctly 

 though sparsely punctulate, except toward the sides and base and more 

 narrowly along the median line ; pubescence fine, short, decumbent and mod- 

 erately dense. Head distinctly narrower than the prothorax, the fovese deep, 

 strongly developed and normal ; eyes moderately large, strongly convex and 

 prominent, situated at somewhat less than their own length from the base. 

 AntennsB slender, more than % as long as the body, the club very gradual and 

 rather slender ; second joint much smaller than the first, longer than wide ; 

 three to eight equal in width and much narrower ; third 1, fourth %, fifth 1}£, 

 sixth fully 1 and seventh %, longer than wide ; eighth quadrate; ninth feebly 

 obtrapezoidal, a little longer than wide ; tenth fully as long as wide along the 

 median line, the apex broadly conical as usual ; eleventh obliquely pointed 

 and as long as the three preceding. Prothorax rather transverse, fully % wider 

 than long, widest very near the middle, the sides evenly and rather broadly 



