author's dissection of a large number of specimens, which 

 show that in all cases examined the species recognized by 

 Blackburn as Amarygmus have bifid mandibles, while in 

 Chalcopterus the apex of the mandibles is evenly truncate. 

 The statement that "there are few specimens in which the 

 mandibles are so hidden that there is the least difficulty in 

 discerning their form" is only true in the larger species, or 

 in the smaller ones if the mandibles happen to be widely 

 extended. Otherwise it is generally necessary to dissect the 

 head, or at least to extend the mandibles, after relaxing the 

 specimen. The author's determination of species has been 

 greatly facilitated by the valuable help given by the late 

 Rev. Canon Blackburn in the loan and gift of co-types, the 

 determination of others, as also by that learned entomologist's 

 valuable memoirs on the subject. An immense number of 

 specimens have been examined, including the valuable col- 

 ]ections in the following museums : — Macleay and Australian 

 Museums, Sydney; National Museum, Melbourne; the South 

 Australian Museum, Adelaide; Queensland Museum, Bris- 

 bane; the Musee d' Histoire Naturelle, Brussels; the four 

 first of which contain many types or co-types named by 

 Blackburn himself. The author would take this opportunity 

 to thank for the courtesy the late Mr. G. Masters, Mr. Rain- 

 bow, F.E.S., Mr. J. A. Kershaw, Mr. A. M. Lea, F.E.S., 

 Dr. Hamlyn-Harris, D.Sc, for their help, and especially Mr. 

 Lea and Mr. C. French, the former for the loan of his fine 

 collection and the gift of many duplicates and the latter for 

 the gift of many new and rare species, as also Mr. H. Griffith, 

 of Adelaide, Mr. A. Giles, F.E.S., of Perth, and Dr. E. W. 

 Ferguson, of Sydney, for much assistance. Lastly, I am 

 indebted to the courtesy of Mr. C. O. Waterhouse for com- 

 paring specimens sent to the British Museum with types and 

 for his valuable notes thereon. 



Since writing the above, I have had the very valuable 

 co-operation of Mr. K. G. Blair, of the British Museum, who 

 has been able to examine and compare the respective types 

 of Fabricius, Hope, Pascoe, and Blackburn, and who has 

 ]Deen good enough to send me copious notes on the species 

 examined. Further, and more valuable still, the authorities 

 of the British Museum have permitted Mr. Blair to send me 

 a large number of specimens, including many that have been 

 compared with these types, so that it is now possible to clear 

 almost the whole group from the clouds of uncertainty. My 

 very cordial thanks are due for the courtesy of the British 

 Museum authorities, and especially to Mr. Blair for this 

 timely assistance and for his permission to use his notes. 



