175 



H. margiiiatus, Blackb., belongs to Group VIII. In the 

 tabulation (loc. cit\, p. 192) it 6tands beside collaris, under 

 "MM." (line 1), and can be distinguished from it thus : — 



N. Base of prothorax wider than base of 



elytra collaris, Blackb. 



NN. Base of prothorax narrower than 



base of elytra marginatus, Blackb. 



STETHASPIDES. 



In my recent Revision of the members of this Group of 

 Lamellicornes I accidentally omitted detailed treatment of 

 the Australian genera of the aggregate called Stethaspides by 

 Laoordaire, and by him regarded as a subsection of the Seri- 

 coides. The first part of my Revision (Trans. Roy. Soc., 

 S.A., 1905) contains mention (on p. 281) of that aggregate, 

 and distinguishes it from the other Australian aggregate of 

 Sericoides ; but when I reached the conclusion of the latter 

 (in the Transactions for last year) I unfortunately forgot 

 the genera of Stethaspides, and also in introducing (Trans. Roy. 

 Soc., S.A., 1908, p. 364) the group of Sericoid genera with 

 claws not simple referred to them as completing my Revision 

 instead of as completing my Revision of one of the two main 

 aggregates into which I had divided the Australian Sericoides. 

 I therefore proceed now to consider the two known Australian 

 genera of Stethaspides. These .have been attributed to three 

 genera: Stethaspis, Colymbomorpha, and Phyllococerus. Mr. 

 Waterhouse — the author of Phyllococerus — characterized the 

 genus without specifying what he regarded as its distinctions 

 from Colymbomorpha, but an examination of the diagnosis 

 indicates the following characters (only) as likely to have been 

 considered by him to be generic, viz. : — Antennae 9-jointed, 

 with a 3-jointed club; clypeus somewhat deeply emarginate 

 in middle. I have the two forms before me, and cannot find 

 any other distinction likely to be generic between them. As 

 regards the number of antennal joints, Blanchard, the author 

 of Colymbomorpha, described the antennas of that genus quite 

 correctly as 9-jointed ; while Burmeister, by attributing 

 Blanchard's Colymbomorpha to Calonota, and stating that the 

 antennae of that genus have only 8 joints, numbered the 

 antennal joints of Colymbomorpha incorrectly. It is possible 

 that Mr. Waterhouse accepted Burmeister 's statement as cor- 

 rect, and therefore regarded "9-jointed antennae" as a char- 

 acter differentiating his genus from Colymbomorpha, though 

 I think this unlikely. There remain, therefore, as probably 

 relied on by Waterhouse, the number of joints in the antennal 

 flabellum and the form of the clypeus. In Colymbomorpha 

 the flabellum has five joints in both sexes (the first two or 

 them very short in the female, which was evidently the sex 



