510 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



ad latera creberrime subtilius rugulose, medium versus grosse 

 acervatim) punctulato, antice alte latissime retuso, parte retusa 

 obsolete insequali supra carina arcuata margiuata (hac antrorsum 

 curvata et in medio leviter obtuse prominenti), parte postiea vix 

 longitudinaliter in medio impressa sed utrinque versus marginem 

 lateralem (hoc fortiter serrulato) sulco l^evi longitudinali valde 

 profundo impressa; angulis anticis sat prominentibus (nullo modo 

 mucronatis) posticis rotundatis ; scutello subtiliter subcrebre 

 punctulato; elytris 15-punctulato-striatis (striis 14^ IS^que nullo 

 modo inter se commixtis, 9^ 10"* vix dispari), interstitiis planis; 

 tibiis fere ut B. tenacis, Blackb., sed anticis extus 5-dentatis. 



Femina a mari (ut supra scriptus) differt capitis et pronoti 

 sculptura; capitis sculptura a B. Macleayi, Blackb., (fem.) baud 

 multo differt, sed puncturis magis subtilibus; pronoto fere ut 

 maris punctulato, parte retusa multo minus alta minus lata, sulcis 

 longitudinalibus lateralibus carentibus. Long. 9-11, lat. 6J-7|- 

 lin. 



This species does not much resemble any other that has been 

 described except B. ingens, MacL, and possibly B. lacunosum, 

 Macl. The former is insufficiently described, scarcely anything 

 but the sexual characters of the male being mentioned, but I 

 note that among those the "forehead" is said to be "vertical and 

 slightly retuse," and the retuse area of the pronotum is said to 

 " show three excavated surfaces, the middle one of which is of 

 crescentic form," and to have "a prominent protuberance on each 

 side," while the thorax is said to be three times wider than long 

 (much less than twice as wide as long in B. truyicatum,) . The 

 above characters all point to strongly defined differences between 

 the two species. B. truncatinn (male) has so wide a retuse area 

 on the front part of its pronotum that the insect has the appear- 

 ance of the front half of its pronotum having been sliced off. 

 The peculiar, somewhat tuberculiform, prominence (distinct, 

 though less strong, in the female) in the middle of tlip carina 

 that tops the retuse area of the pronotum distinguishes this 

 species from all the others (known to me) having a carina arched 

 forward at the top of the retuse area. B. lacunosum, Macl., is 



