892 



Mr. G. A. K. Marshall on 



Gkoup. 



Species. 



ScARAB^iD^. Onitis alcxis. 



Onlho2)hagus gazclla. 



Gymnopleurus smarag- 



dinus. 

 Oniticcllus militaris. 



Heteromeka. Praogena fcstiva. 



Carabid.e. Antkia thoracica. 



„ massilicata 



. (only eaten when 

 offered piecemeal). 

 LONGICORXIA. CeroiJlcsisfallax. 



Size axd Appearance. 



Medium ; brown elytra and 

 legs, iridescent green thorax 

 and head. 



Smallish ; similar colouring to 

 above. 



Small ; iridescent green, blue, 

 or red. 



Small ; probably when fresh 

 iridescent dark-green with 

 orange markings. 



Medium ; almost black with 

 purplish iridescent reflec- 

 tions on elytra, bluish on 

 thorax. 



Large ; black, white spot on 

 thorax and white margin to 

 elytra. Huge mandibles. 



Large ; black with pale mar- 

 gin to elytra. Huge man- 

 dibles. 



Large ; black, yellow-banded, 

 Cantharid type; 



22. The Chief Conspicuous Specially-Defended 

 Groups in the Coleoptera inferred from 

 G. A. K. Marshall's Experiments. A Compari- 

 son between Coleoptera and Lepidoptera in 

 this Eespect. (E. B. p.) 



It is of great interest to attempt to conclude from the 

 results of the experiments on the palatability of conspicu- 

 ous Coleoptera contained in this memoir, and from 

 previously recorded observations and experiments on the 

 same order of insects, what are the chief specially defended 

 groups which may be considered to stand in the same 

 position towards their allies as the Ithomiinx, Danainx, 

 Heliconinm and Acrxinx do to the rest of the Rhopalocera, 

 and the AgarisHdx, Sy7itomiihv , Zygxnidx, etc., do to the 

 rest of the Heterocera. 



The chief memoirs upon which the conclusions stated 

 below have been based are published in the Transactions 

 of the Entomological Society of London. They are the 

 papers by Mr. C. J. Gahan (1891, p. 867), by Mr. H. 

 Donisthorpe (1901, p. 845), and the Presidential Address of 

 Canon W. W. Fowler, Jan. 15, 1902 (Proc. 1901, p. xxxiii). 

 I have also had the opportunity of reading the manu- 

 script of an important paper by Mr, R. Shelford on mimicry 

 in Bornean insects, now being published by the Zoological 



