322 MISCELLANEA ENTOMOLOGICA, 



Those without wings he refers to the following genera : — 



Helluo Bon., to which only two species can now be referi'ed — 

 costaius Bon., from New South Wales, and carinattis Chaud., 

 from Victoria. 



PsEUDHELLUO Casteln., represented by one species, Wilsoni 

 Casteln., an insect I have never seen. 



AcROGENTS MacLeay, one species, Mrsuta MacLeay, "W. 



Helluodema Casteln., also represented by one species, Batesii 

 Thomson. 



The Helluonidas with wings, Castelnau divides into the genera 

 GiGADEMA Thomson, Helluosoma Castelnau, and Enigma New- 

 man. To these must now be added the present genus Lachno- 

 derma. 



This winged division of the sub-family is very much more 

 numerous than the unwinged, and I regret to find in G-emminger 

 and Harold's " Catalogus Coleopterorum," that the three genera 

 to which Count Castelnau referred them, have been merged into 

 one — the JEiiigma of Newman. 



Mr. Masters has also made the same mistake in his Catalogue 

 of Australian Coleoptera. 



. Gigadema and Helluosoma do not present any great difierences 

 of structure, still I think there are sufficient distinctions to justify 

 Count Castelnau's classification, but as regards vEnigma there are 

 wide and important differences which can leave no doubt as to the 

 propriety of the subdivison. The species of these three genera 

 hitherto described are : 



Gigadema, 8 species — grande MacLeay, Titanum Thomson, 

 longifenne Germar, sulcatum MacLeay, politulum MacLeay, 

 Bostockii Casteln., Paroense Casteln., and minutum Casteln. 



Helluosoma, 5 species — atrum Casteln., cyaneum Casteln., 

 Mastersii MacLeay, resplendens Casteln., and cyaneipenne Hope. 



-Enigma, 3 species — Iris Newman, splendens Casteln., and 

 Newmanni Casteln. 



Enigma unicolor Hope, from Port Essington is believed by 

 Count Castelnau to be a Gigadema. 



The following are new species in my collection : — 



