BY W. MACLEAY, ESQ., F.L.S. 365 



BOLBOCERAS LACUNOSUM. 



Long. 8 lin. 



Piceo-rufum nitidum, capite punctato antice transversim carin- 



ato obsolete tridentato, thorace punctato subplano haud 



retuso medio subtriangulariter excavato excavatione antice 



postice et utrinque tuberculo instructa, elytris nigris fortiter 



striato-punctatis interstitiis subconvexis, tibiis anticis extus 



sexdentatis. 



The peculiarity in this species is the horizontally placed thorax 



with a large triangular or cordiform excavation in the middle, at 



the apex of which there is a small horn, a tubercle on each side, 



and a rounded pi'ominence behind. It is found near Sydney. 



This and the two following insects are without horns on the head. 



BOLBOCERAS PLANICEPS. 



Long. 4 lin. 



Rufum nitidum capite piano Isevi antice punctato triangu- 

 lariter transversim carinato tenuiter tridentato, thorace 

 Isevi minime retuso margine apicali bifoveato linea media 

 antice impressa ad latera antice rugose punctato medio sub- 

 transversim punctato-foveolato, elytris 8 vel 9 striatis 

 striis leviter punctatis interstitiis planis, tibiis anticis extus 

 sexdentatis dentibus duobus basalibus subobsoletis. 

 Hab. Sweer's Island. 



The flat, smooth head, and the limited number of striae on the 

 elytra will serve at once to enable any one to recognize this 

 insect. The median line is broadly marked, on the anterior and 

 slightly retuse portion of the thorax, there are two small fovese 

 on the anterior edge, and an elongate punctured one near the 

 middle of each side. 



BOLBOCERAS SWEERII. 



Long. 3 1 lin. 



Piceum nitidum, capite punctato medio obtuse tuberculato 

 antice subtriangulariter leviter carinato, thorace parce 



