226 LAKE SUPERIOR. 



Lachnosterna Hope. Dichelonycha Har. Kb. 



* quercina. hexagona. 



Mel. querc. Kn. N.Beit. 74. Melol.hex. Germ. Ins. Nov. 124. 



*" anxius. elongata Harris. 



* consirnllis. Melolontha elongata F. El. 2, 174. 

 **futilis. virescens Kb. N. Z. 134. 



Serica M'Leay. testacea Kb. N. Z. 135. 



vespertina Dej. Cat. Backii Kb. N. Z. 134. 



Mel. vespertina Say. J. Ac. 3, 244. Osmoderma Lepell. 



^tristis. scabrum. Gory ^' P. Cet. tab. S,Jig. 2. 



DiPLOTAXis il«?%. S Gymnodusfoveatus Kb. N.Z. 14:0. 



tristis Kb. N. Z. 130. ? ■ rugosus Kb. N. Z. 140. 



8^ L. quercina. — Castanea nitida, supra glabra, antennis pedibusque testaceis, thorace 

 minus subtiliter punctato, antice angustato, lateribus parum dilatatis, angulis posticis 

 rectis, basi media late minus extensa, elytris obsolete 3-costatis sat dense punctatis 

 rugosisque, umbone humerali minus elevata, angulo suturali obtuso, pygidio parce 

 punctato. Long. -93. 



,J antennarum clava parte reliqua longiore, corpore cylindrico. 



9 antennarum clava brevi, corpore postice leviter dilatato. 



This is one of a group of very closely allied species, which I have divided according 

 to the form and punctuation of the thorax, and the form of the sutural angle of the 

 elytra. It is the common species everywhere, and is probably Mel. quercina Knoch. 



^'' L. anxia. — Nigro-castanea nitida, supra glabra, antennis pedibusque rufo-testaceis, 

 thorace sat dense distinctius punctato, antice angustato, lateribus parum dilatatis, 

 angulis posticis rectis, basi media late minus extensa, elytris leviter 3-costatis distinct- 

 ius sat dense punctatis, umbone humerali prominulo, angulo suturali obtuso, pygidio 

 parce punctato, basi longitudinaliter rugoso. Long. "92. 



9 Corpore postice modice dilatato. More dilated behind than the preceding, with 

 larger punctures on the thorax and elytra. 



^ L.consimilis. —Postice nondilatata, castanea, nitida supra glabra, antennis pedibusque 

 testaceis thorace subtilius parce punctato, antice angustato, lateribus modice dilatatis, 

 angulis posticis rectis, basi media late extensa, elytris dense subtiliter punctatis rugos- 

 isque, angulo suturali valde obtuso, pygidio parce punctato, basisubruguloso. Long. '93. 



(J clava antennarum parte reliqua vix longiore. 



Differs from the large eastern species (Mel. brunnea Kn.) in having the thorax less 

 dilated on the sides, the posterior angles not acute, and the sutural angle of the elytra 

 very obtuse. 



^* L. futilis. — Dilute castanea supra glabra nitida, antennis testaceis, thorace sat 

 dense minus subtiliter punctato, latitudine triplo breviore, antice angustato, lateribus 

 modice dilatato, angulis posticis obtusis, basi late rotundato, elytris sat dense punctatis 

 sub umbone humerali modice elevata late impressis, angulo suturali subobtuso, pygidio 

 punctato, abdomine densius subtiliter punctulato. Long. "6. 



1 S. tristis. — Oblongus convexus, piceus punctatus, capite pone oculos l:cvi, thorace 

 latitudine duplo breviore, antice angustato, lateribus ante medium rotundatis, angu- 

 lis posticis rectis paulo rotundatis, basi bisinuata, margine tenui basali lacvi : elytris 

 obsolete cyaneo micantibus, lateribus parallelis, leviter sulcatis, in sulcis punctatis, 

 interstitiis Iffivibus, pedibus rufo-piceis, antennis testaceis 9-articulatis. Long. -32. Cly- 

 peus flat, densely punctured, margin scarcely elevated, broadly emarginate, marked 

 anteriorly with a fine transverse line. 



