IDIS.J b\ H. <Jravel\ : /'axsnlidae of llif Wmld. 19 



Aulacocyclus deyrollei, Kaup. 



Aulacocijdiis di i/rolhi. Kaii|), IHHS'J, pp. 7-H. 

 Tiu'itiocenis dtifrnllei. Kiiwt.Tt, 1897. p. 'll'). 



One specimen 255 nun. loiiti. \n the liidiau .Musriim tollectioii. I liavi- alscj e.xainined 

 specimens in the Biitisli .Museum. 



A. dei/rollri (Wi'icv:^ irom A. tn(isfer<i i>n\y \n the much greater breadth of the central 

 tuben'le and in the more conspieuous puncturiiif^ of the anterior part of tlie iiead. 



Aulacocyclus tricuspis, Kau]). 

 Fig. III. :.. 

 Aulacocyclus tricuspis. Kaiip. l868<r. p. 7. 

 Several specimens from Xow Caledonia and one tmni Woodlark Island. Length 22-2^ 

 mm. 



This species is easily recognised by the tridentate form of the central tubercle, which 

 resembles that of Coma pen pi's ntricornis. except that it is always broadest between the 

 paired dorsal denticles. The antemial lamellae are much shorter than in A. deyrollei. The 

 punctures in the grooves of the elytra are almost uniformly coar.se. 



Aulacocyclus errans, Blackburn. 

 Fiu. HI. iJ. 

 Aulacocyclus cMins. Blackburn, 189G, p. 233. 



Both sexes of this .species appear to occur in two forms distinguishable from each other 

 only bv their size. 



Large form. — Several specimens from (Queensland. .Mr. II. Schroder has presented us 

 with specimens from the New England District of New South Wales. Length 27-30 ram. 



Small form. — Numerous specimens from Queensland, including four from Cooktown. 

 three from the Mclvor River and one from Card well. Length ig-6-2^-o mm. 



The antennal lamellae are somewhat shorter than in A. deyrollei. The central tubercle 

 rises almost vertically and is then bent over forwards, the antero-ventral surface gradualh' 

 and the postero-dorsal abruptly, the dorsal surface being straight and more or less 

 horizontal. The anterior enlargements of the pronotal marginal grooves are somewhat 

 more pronounced than in other species of the genus. The grooves of the elytra are 

 even more coarsely punctured than in ./. tricuspis. 



Aulacocyclus edentulus (.MacLcay). 



Fis.'. 111. 7. 

 Pii.isahis e>1eiiluhi.<!, MacLeay, 1826. p. 439. 

 A number of .specimens from Queensland (Brisbane), New South Wales (Sidnev) and 

 Victoria. Length 23-30 mm. 



The (central tubercle is more strongly elevated than in A. errans and less abruptlv bent 

 forwards. The anterior enlargements of the pronotal marginal groove are not vers* 

 pronounced. The elytral grooves are le.ss .strongly punctured, especially dorsallv. 



Aulacocyclus teres {IVMchcron). 

 Fm lll.s. 

 Pa.i.fal us teres, Porclieron. 1841, pp. 39-40. 

 A number of .specimens from Queensland, New South Wales and N'ictoria (.Melbourne). 

 Length 30-8-400 mm. 



