224 LAKE SUPERIOR. 



Mycetophagus Fahr. americanus Payh. 31. 



pictus. subrotundus Say. J. Ac. 5, 39. 



Triphyllus Latr. Paromalus Er. 



didesmus. [261. bistriatus Er. Jahr. 



Mycetophagus did. Say. J. Ac. 5, Sapuinus Leach. 



Dermkstes Lin. pensylvanlcus Er. 1 84. 



murinus Lin. Er. Ins. Germ. 3, 429. assimllis Er. 184. 



Byrrhus Linne. distinguendus. 



^ americanus. proximus. 



cyclophorus Kb. N. Z. 11 7. mancus. 



picipes Kb. N. Z. 116. Hister m. Say. J.Ac. 15, 41. 



varius Fabr. El. 1, 105. fraternus Lee. B. J. 5, 77. 



^ eximius. Hister f. Say. J. Ac. 5, 40. 



^tesselatus. Platycerus Latr. 



Syncalypta Dillwyn. ^ depressus. 



*' echinata. quercus Schon. 



Platysoma Leach. PI. securidens Say. J. Ac. 3, 249. 



depressum Er. Jahr. 111. Lucanus querc. Weber Obs. 1, 85. 



Hister Lin. Geotrupes Latr. 



abbreviatus Fabr. El. 1, 89. mlarophagus Say. J. Ac. 3, 211. 



depurator Say. J. Ac. 5, 33. 



86 B. americanus. — Oblongo-ovatus, antice acutus, convexus, niger dense breviter 

 fusco-pubescens, thorace nigro cinoreoque variegata, elytris sutura vittisque 4 nigris, 

 guttis albis intcrruptis, qua? spatium transversum antice dentatum, postice latcribus 

 obliquis, medio recte truncatum, formant ; guttisque nonnuUis aliis versus apiccm ob- 

 lique retrorsum positis ; tenuiter striatis. Long. -4. Twice the size of B. cyclophorus ; 

 found from Niagara to Lake Superior. 



8^ B. eximius. — Oblongus antice acutus, lateribus parallelus, niger fusco-pubescens, 

 nigro flavoque variegatus ; thorace nigro, cinereo flavoque variegato, elytris striatis, 

 sutura vittisque 4 nigris, his guttis interruptis, lineam ante medium transversara den- 

 tatam, figuram semicircularem antice dentatam, lineamque versus marginem antror- 

 sum obliquam formantibus, his omnibus postice flavo tomentosis. Long. -2. Pic. 

 The middle part of the anterior margin of the semicircular figure forms a broad com- 

 mon cinereous spot. 



88 B. tesselatus. — Elongatulus, utrinque subacutus, virescente-niger nigro-pubescens, 

 elytris striatis cinereo tesselatis, subtus niger, pedibus piceis. Long. -12. Pic. 



8' S. echinata. — Breviter ovata, utrinque attenuata, nigra parce cinereo-pubescens, 

 setis erectis clavatis nigris adspersa, in elytra longioribus uniseriatim in striatum in- 

 terstitiis positis ; striis tenuibus, marginal! sola profunda. Long. | lin. Eagle Har- 

 bor. 



90 P. depressus. — Depressus, niger vix seneus, thorace lateribus pone medium angula- 

 to, angulis posticis obtusis minirae rotundatis, elytris profundius punctatis, striatisque. 

 Long. -62. Twice the size of P. quercus, the elytral stria are alternately a little ap- 

 proximated ; the mandibles of the $ are much dilated at the apex, but less curved than 

 in P. quercus. A very small specimen has the sides of the thorax behind the angle 

 emarginate, so that the basal angles become still more prominent and scarcely obtuse. 



