NORTH AMERICAN COLEOPTERA. KiT 



nenco it may bofonie nearly obsolete, as in mouodon. The crest seems 

 to be normally absent in one species, plitnicortm. 



With these preliminary words the followin<i; table of our species is 

 presented : 



Elytra rounded at tip in the male 2. 



Elytra obliquely truncate at tip in the male 10. 



2. — Pubescence fine, recumbent, very rarely a few short semi-erect liairs in 



series 3. 



Pubescence coarse, with many conspicuous erect hairs either irregularly placed 



or in series 8. 



3. — Thoracic horn distinctly cristate 4. 



Thoracic horn without crest 7. 



4. — Elytra black, uniform in color bicolor. 



Elytra variegated j. 



5. — Last ventral of male with a large deep fovea, elytra in both sexes conjointly 



rounded iiuperiif^. 



Last ventral of male simply impressed fi. 



6.— Elytra sub-opaque, truncate in the female talpa. 



Elytra shining, conjointly rounded at tip in both sexes bilusciatiis. 



7. — Elytra moderately densely punctured |>iaiii<'oruis. 



8. — Thorax relatively small, horn very narrow :ipiealis. 



Thorax normal, the horn rather wide and distinctly serrate 'J. 



^. — Anterior tibiae of male toothed at middle on the inner side, elytra fasciate at 



middle .' calvaratiis. 



Anterior tibise of male simple, elytra fasciate slightly beliind the middle. 



ni4»no(loii. 



10.— Thoracic horn broad, wider than its crest, and always serrate »iOrralllN. 



Thoracic horn narrow, rarely wider than the crest, very feebly or not at all 



serrate II. 



11. — Crest of horn badly defined, not distinctly margined, very feebly elevated, 



iiiicliora. 



Crest of horn distinctly elevated, well margined at least at the sides 12. 



12.— Thorax nearly truly globose. 



Elytra parallel, coarsely punctured (I<'iiii(latiis. 



Elytra slightly oval, sparsely punctured COiii'oriiiiN. 



Thorax transverse, elytra oval cavicoriiis. 



5f. l»icol<>r Say. — Black, thorax and legs ru fo- testaceous ; head finely punc- 

 tured and pubescent, the front concave; antennie rufous, somewhat darker exter- 

 nally; thorax oval, very slightly broader than long, the horn moderate in length, 

 ratlier broad, obtuse at tip, the sides coarsely serrate, crest feebly elevated, scarcely 

 margined, but serrate; surface of thora.x finely sparsely punctured, the pubescence 

 silken and recumbent; elytra oblong, humeri distinct ; surface opaque black, finely 

 but not densely punctured, clothed with a fine cinereous recumbent pubescence, 

 in which are placed slightly longer hairs, very little erect, arranged in rows; 

 apices of elytra conjointly rounded and exactly alike in the two sexes; beneath 

 •opaque, very finely punctured, and clothed with cinereous hairs. Length .14 inch : 

 3.5 mm. 



