6 The Cane Grubs of Australia. 



(18) Size larger ; width of head, G ram. ; mandibles without a tooth jvist laterad of 



retinaculum . . . . . . • . ■ • . . = Calloodes greyanus. 



Size smaller ; width of head, 4-o mm. ; mandibles with a tooth just laterad of 

 retinacuhim . . . . . . ■ . ■ . . . = Repsimus ceneus. 



(19) Head strongly transversely wrinkled . . . . . . = Horonotus optatus. 



Head punctate = (20). 



(20) Second lobe of anal segment dorsad with most of its surface, raised and bounded 

 by an oval suture ; epicranial sclerite with a row of setre near its anterior 

 margin, and setse scattered over its surface ; second antenna! joint with two 

 seta; . . . . ■ . • ■ ■ • ■ ■ ■ . ■ . = Xo. 71. 



Second lobe of anal segment dorsad plain ; epicranial sclerite wholly without 

 setse ; antennae wholly naked . . . . . . . . . . . . = (21). 



(21) Peritremes not distinctly open ; legs not distinctly increasing in size ; whole 



body with very dense pubescence ; latero-cervical shield with at least several 

 setse along its margin ; size very large . . = Xylotrtipes anstralicus. 



Peritremes distinctly open ; legs distinctly increasing in size ; body with much 

 sparser pubescence, quite sparse on thorax dorsad ; latero-cervical shield with 

 one or two setse only along its margin ; size niedium to medium large = (22). 



(22) Setse at apex of abdomen ventrad in about eight irregular rows longitudinally 



and transversely ; width of head, 4 mm. . . . . = Isodon puncticollis. 



Setae at apex of abdomen ventrad denser, in about twelve irregular rows longi- 

 tudinally and transversely . . . . . . . . . . . . = (23). 



(23) Epicranial sclerite well separated from the clypeus ; latero-cervical shield with 



two setae, one each on anterior and posterior margins ; second antennal joint 

 not twice as long as greatest width ; thorax dorsad with moi'e setse ; width 

 of head, 4-25 mm. . . . . . . = Semanopterus depressiusculus. 



Epicranial sclerite not well separated from the cljrpeus ; latero-cervical shield with 

 one seta only, on its posterior margin ; second antennal joint over twice as long 

 as greatest width ; thorax doisad with less setae ; width of head, 6-10 mm. 



= Dasygnathus aiistralis. 



THE PUP^. 



No attempt has previously been made to separate the pupfB of the 

 various species, but Girault has described those of Lepidiota alhohirta, 

 Anoplognathiis hoisduvali, and Cacachroa dccorticata, in full. The table 

 herewith given makes an effort to distinguish the species by recognisable 

 characters, and also to place them, as far as possible, in their relations 

 to each other ; this has not always been effected, for though the various 

 Melolontlddes fall into a natural grouping, the Rutelides and Dymistides 

 are not readily separated. Nineteen species are listed, being the pupJB of 

 the more conunon soil-inhabiting scarabtFid grubs of the Cairns district. 

 Closely allied adults would appear to have closely allied pupie and larva? ; 

 for example, note the species of Lepidiota, where this hypothesis is seen 

 to be very true. 



TABLE TO THE PUP.E. 



(1) Cremaster bearing two sharp spines .. .. .. .. .. = (2). 



Cremaster unarmed . . . . . . . . . . . . . . . . = (10). 



(2) Clypeus bidentately emarginate ; size small. 



Intermediate tarsi not attaining apex of elytra, the posterior tarsi a little 

 shorter than their tibi;B ; el^^tra not attaining apex of wings 



= Epholcis hilohiccps. 

 Clypeus straight or nearly . . . . . . . . . . . . . . = (3). 



(3) Posterior tarsi longer than their tibiae ; size moderately small . . .. =(4). 

 Posterior tarsi distinctly shorter than their tibia; ; size large to medium = (6). 



