398 Mr. G. J. Arrow on Rutelid Coleoptera. 



The purplish lustre characterizing all the specimens I have 

 seen may, perhaps, not be absolutely constant, but another 

 feature distinguishing thissjiecies from the two just mentioned 

 is presented by the apices of the elytra, which are separately 

 rounded. 



Although these three insects are the only described species 

 of this section of the genus, it consists of a number of closely 

 related forms. As 1 am not able to decide with certainty 

 w hich of these is Burmeister's species, it would be unwise to 

 attempt at present to name the other nondescripts. 



Another beautiful Australian Rutelid, also sexually di- 

 morphic, requires further description. This is the PopilUa 

 jiavomaculata of McLeay, a species probably described from a 

 single specimen and quite erroneously placed. Specimens of 

 this insect have lately been brought from Mount Bellenden 

 Kcr, in North Queensland, and it was only by an accident 

 that I was led to consult McLeay's description, for neither in 

 form nor structure has the species ajiy resemblance to Popillia, 

 a genus which is not known in Australia. The rather de- 

 l^ressed and elliptical form and pubescent surface of flavo- 

 maculata distinctly suggest Adoretus, but its mouth-parts dis- 

 prove any such afl5nity. The flat prosternal process upstanding 

 behind the cosse is known elsewhere among Rutelidfe only in 

 the genus Mimela, but the ten-jointed antenna?, as well as its 

 entire aspect, seem to exclude this insect from the Anoma- 

 linse. Although I am unable to pronounce upon the true 

 place of this new genus in the family, its remarkable combi- 

 nation of characters, together with the peculiar beauty of its 

 colour and marking, will make it quite easy of identification 

 when rescued from the obscurity of a great genus to which it 

 does not belong. 



MiMADORETUS, gen. nov. 



Ellipticus, euldepressus. Clypeus subquadratus, transversus. La- 

 brum fiimplex, late emarginatum. Maxilla? 3- deiitatae, palporum 

 articulo ultimo grai^di, fu&ifoimi, longitudine ad reliquos aequali. 

 Labium latum, margine paulo ccncava. Antenna; lO-articulatse, 

 clava triphylla, parum elongata. Prosternum post coxas promi- 

 nens, cuneilorme. !Metasternum inter coxas medias acutum, non 

 productum. Pedes omnes robiisti. Tibiae anticce fortiter biden- 

 tatae. Maris ungues integri, femina; pedis antici externus fissus. 



The type of Mimadoretus Jlavomaculatus is evidently a 

 female, in which sex the upper surface is of a light mahogany- 

 colour, with a metallic lustre, especially upon the prothorax. 



