216 LAKE SUPERIOR. 



" lurldipennis. Gyrinus Lin. 



^ notabilis. afBnis Aube, 669. 



^ conoideus. patruells. 



^ ovoideus. conformls Dej\ 



" suturalis. venlralis Auhe\ 6 72. 



**dispar. ventralis Kb. K Z. 80. 



Every intermediate variety occurs : a is more common on the south, /? on the north 

 of the lake. 



81 H. luridipennis. — Elliptico-ovalis, subdepressus, niger dense subtiliter punctatus 

 breviterque pubescens, capite antice posticeque ferrugineo, thorace lateribus obliquis, 

 rectis, anguste ferrugineis, disco sparsius punctulato, elytris apice vix oblique attenuatis 

 fulvis ; antennis palpis, pedibusque rufis. Long. -17. Eagle Harbor. 



*2 H. notabilis. — Elongato-ovalis, antice obtusus, postice oblique attenuatus, nigro- 

 piceus pubescens, capite punctulato, antice posticeque testaceo, thorace dense punctu- 

 lato, obsoletius in disco, basi obsolete depressa, lateribus valde obliquis rotundatis, 

 elytris elongatis, confertissime subtiliter puuctatis, piceis, margine pallidiorc, anten- 

 nis tenuibus, cum palpis pedibusque rufis. Long. -21. One specimen, Black Bay. 



83 H. conoideus. — Elongato-obconicus, nitidus, capite rufo, thorace nigro, lateribus 

 rufis obliquis leviter rotundatis, basi utrinque obliquo, non sinuato, obsoletius punctula- 

 to, ad latera parce punctato, lineaque punctorum ad apicem ; elytris parce punctatis, 

 rufo-testaceis ; antennis minus tenuibus cum palpis pedibusque testaceis. Long. -2. 



3 antennis articulis 3 — 6 dilatatis, compressis. One specimen. Eagle Harbor. 



8< H. ovoideus. — Convexus, utrinque modice attenuatus, subtus nigro-piceus, supra 

 ochraceus, capite infuscato, macula verticali pallida, thorace brevi lateribus obliquis vix 

 rotundatis, cum elytris angulum obtusum formantibus, basi infuscato, sparsim subtili- 

 ter punctulato, punctis majoribus ad basin et latera interjectis, aliisque densioribus ad 

 apicera transversim ordinatis ; elytris minus sparsim punctatis, stria suturali vix im- 

 pressa, sutura antice laevigata : antennis palpis pedibusque ferrugineis. Long. 'IS. 



^ femina paulo nitidior. Eagle Harbor. 



88 H. suturalis. — Ovalis modice convexus, postice leviter attenuatus subtus niger, 

 undique densius minus, subtiliter punctatus, capite testaceo ad oculos infuscato thorace, 

 lateribus obliquis parum rotundatis cum elyti'is vix angulatis, testaceo basi apiceque 

 anguste, medioque triangulariter nigro, punctis ad basin et apicem densioribus, trans- 

 versim ordinatis ; elytris lateribus vix rotundatis ad apicem suboblique attenuatis, 

 fuscis, margine basali lateralique cum apice, sutura lineisque 1 vel 2 anticis, antennis 

 pedibusque testaceis. Long. -IS. 



At first sight seems to be a variety of the preceding. It is less convex and less nar- 

 rowed in front. The points of the elytra at the base are unequal, but at the apex 

 they become more dense and equal. 



86 H. dispar. — Regulariter elliptico-ovalis, minus convexus, subtus niger, supra cum 

 antennis pedibusque ferrugineus nitidus, capite thoraceque dense subtiliter punctatis, 

 hoc punctis ad basin et apicem transversim densioribus, lateribus obliquis leviter rotunda- 

 tis, cum elytris (lateraliter visis) angulum obtusum formantibus ; elytris apice rotundatim 

 attenuatis, sparsim subtiliter punctulatis et minus subtiliter sat dense punctatis, pree- 

 cipue ad apicem. Long. '15. 



Some of the scattered punctures at the base of the elytra have a tendency to form 

 three distant longitudinal bands, the first being near the suture. 



