65 



MACROPHYLLIDES. 



This aggregate stands in Lacordaire's classification as the 

 7th "subtribe" of the Melolonthides, the Melolonthides 

 being treated by him as the first "Tribe" of the second 

 "Legion" (Lamellicornes Pleurostictiques) of the "Family" 

 Lamellicomes. As, however, a "subtribe" (Systellopides) 

 has been added in the Tribe since the date of Lacordaire's 

 work, and is (rightly, I think) placed as its first member, 

 the Macrophyllides become the 8th subtribe. Of the eight sub- 

 tribes three are not as yet known to occur in Australia, and 

 therefore this subtribe is the 5th as far as Australian Melo- 

 lonthides are concerned. I have already discussed this classi- 

 fication more fully in former papers (e.g., Trans. Roy. Soc, 

 S.A., 1905, p. 276), and now merely summarize the outline 

 for the sake of convenience. A tabular statement of the 

 characters of the sub tribes will be found in the memoir just 

 referred to. It should be noted, however, that in the state- 

 ment the Macrophyllides stand as the last of the subtribes 

 known to be Australian, whereas in the following pages of 

 this present memoir I am referring an Australian species to 

 the 8th of Lacordaire's subtribes (the 9th including the 

 Systellopides) — viz., the Pachypodides, and that that sub- 

 tribe should therefore be added after the Macrophyllides. 

 Lacordaire distinguishes the Pachypodides from the other sub- 

 tribes by its "mouth organs partly atrophied." The Systello- 

 pides also have mouth organs partly atrophied, but differ from 

 the Pachypodides by, inter alia, their labrum on the plane 

 of the clypeus projecting forward from that organ. 



Of known Australian M elolonthid species only one apper- 

 tains to the Macrophyllides, viz., Othnonius batesi, Olliff. 

 There can, however, be little doubt that the Australian insect 

 on which Erichson founded his genus Holophylla (without 

 naming the species) is a Macrophyllid, and is distinct from 

 Othnonius batesi. I have discussed that genus in a former 

 paper (Trans. Roy. Soc, S.A., 1911, pp. 181, etc.), in 

 removing it from the true Melolonthides, and have nothing 

 fresh to be added now concerning it. 



PACHYPODIDES. 



ZIETZIA. 



When I described this genus (Trans. Roy. Soc, S.A., 

 1894, p. 205) I attributed it to the Macrophyllides, but my 

 subsequent study of the Australian Melolonthides has made 

 me very doubtful for some time past whether I was right 

 in placing it there, on account of its simple claws and its 

 facies. The fact is that at the time I described it I had the 



