222 LAKE SUPERIOR. 



Cyrtusa Er. truncatus. 



'^ globosa. Nitidala truncata Rand. 5. /. 2, 1 8. 



'" Sternuchus. tantillus. 



gibbulus. Carpophilus Leach. 



Agathidium Illiger. niger Er. Germ. Z. 4, 263, 



" ruficorne. Cercus niger Say. J. Ac. 3, 195. 



" revolvens. Epur^a Er. 



Phalacrus Payk. flavicans. 



" diffbniils. Ticina. 



Olibrus Er. parvula. 



* aplcalis. longula. 



Brachypteru3 Kugellan. parallela. 



urticae Kug. Er. Ins. Germ. 3, 132. retracta. 



Colastus Er. rufa Er. Germ. Z. 4, 273. 



semitectus Er. Germ. Z. 4, 243. Nitid. rufa Say. J. Ac. 5, 180. 



^* C. globosa. — Hemispherica. nigro-picea, nitida, thorace subtiliter dense punctulato 

 basi truncato, angulis posticis vix rotundatis, margine diaphano : elytris dense punctu- 

 latis, punctisque vix majoribus seriatim positis, antennarum basi, tarsis tibiisque piceis, 

 his anticis non dilatatis. Long. -13. 



'6 Sternuchus. Antennse capillares, articulo 1™" crassiore majore ; 3 ultimis parum 

 dilatatis, omnibus setis 2 longis apicalibus. Metathorax subtus permagnus, promi- 

 nens, planus, antice declivus, pedibus intermediis in declivitate profunde sitis, approxi- 

 matis. Coxaj antics, exsertse, conicie, postiea; permagnaj laminatag, abdominis partem 

 anteriorem obtegentes. Abdomen parvum, 5-articulatura, (articulis 2 primis consoli- 

 datis ?) Tarsi filiformes consolidati, unguibus simplicibus. 



Head large, semicircularly rounded anteriorly, acutely angulated on the sides behind, 

 labrum very short, almost concealed by the margin of the clypeus. Thorax very short, 

 not emarginate in front, base rounded, angles none. Elytra covering the abdomen, 

 declivous, scarcely convex behind. Palpi filiform. I should have considered this insect 

 a Cybocephalus, but for the filiform tarsi. The structure of the antennae ditfers from 

 Oyllidium, but I am by no means certain that I have placed it in a proper position : it 

 seems to have some relation to Clambus, but the great size of the metasternura and 

 posterior coxa; prevents a complete examination of the lower surface. 



S. gibbulus. Globatilis, gibbus, niger Isevissimus, antennis ore pedibusque flavis. 

 Long. J lin. 



''"' A. ruficorne. Globatile supra nigrum, elytris vix punctulatis, stria suturali postice 

 profunda, antennis pedibusque rufis, abdomine sa?pius ferrugineo. Long. -08. Hab. 

 ubique. 



'8 A. revolvens. — Globatile at minus convexura, nigrum, elytris dense subtiliter punc- 

 tatis, obsoletissime striatis, stria suturali, profunda. Long. •14. 



'3 P. difformis. — Hemisphericus, rufescenti-piceus, thorace vix obsolete punctulato, 

 lateribus subrectis, basi cum angulis posticis rotundata, elytris sat dense punctulatis, 

 8tria suturali profunda. Long. 08. 



$ Mandibula sinistra cornu erecto curvato longitudine caput aequante. 



*" O. apicalis. — Breviter ovalis, postice vix angustatus, convexus, piceus nitidus, 

 thorace basi truncato, elytris impunctatis, stria suturali impressa, aliisque 1 vel 2 obso- 

 letissimis, apice corporeque subtus rufo, antennis pedibusque flavis. Long. 'OS. 



N. B. The maxillary palpi have the last joint somewhat securiform. * 



