cism of these systems follows. The external structure of Ho- 

 moptera is discussed at length, particular attention being paid 

 to neuration, a synonomy of the varied terms used by different 

 authors being given. Two hundred and thirteen new species are 

 described, and eighty-four new genera. 



Part X is supplementary to Pt. I and IV, and gives figures 

 of structures, etc., discussed in Part 1, which is without plates. 



CONCLUDING REMARKS. 



In the early part of this Bulletin I have referred to Mr. Koe- 

 bele's work in North America in the summer of 1903. As I 

 have pointed out, he was successful in finding there at least two 

 species of parasites, which readily attacked the cane leaf-hop- 

 per in our cages, and broods were raised on these, and liberated 

 in numbers in the cane fields. One of these was the species de- 

 scribed by me as Haplogonatopns amcricanus \ the other was rais- 

 ed in smaller numbens and none were preserved, but it was 

 almost certainly a Psciidogoiiatopits. A great deal of time was 

 spent in a vain endeavour to establish the Stylopid, Elciichits, 

 which would most likely have proved a useful parasite, and we 

 are now again trying by every means to introduce it from Fiji, 

 where it attacks the Vitian cane-hopi)er. As to the Dryinids 

 above mentioned, I have hopes that they may yet prove to be 

 established, for it cannot l)e expected that they would increase 

 at nearly so rapid a rate as the Mymarid egg-parasites. Dur- 

 ing the past fifteen years I have paid great attention to the rate 

 of increase of insects imported into these islands, and collected 

 statistics on this subject. I find that even with verv prolific 

 insects, of which several or many individuals have been intro- 

 duced, it is rarely that they can ])c found by an entomologist 

 for at least three years. I am now of course speaking of insects 

 accklentally imported with plants, not those beneficial ones, 

 which are specially reared under cover for economic purposes 

 and distributed again and again in large numbers to many local- 

 ities. I will take as an instance the Locustid, Xiphidiii'm vari- 

 pciDic, because it is a species specially considered in this Bulletin, 

 although it is not one of the several species, of which 1 know 

 the exact date of importation. In November, 1892, a hard 

 day's work produced two specimens of this cricket in the lower 

 part of the Pauoa Valley: in 1893 and 1894 it was not seen. 

 In 1895 I revisited the exact locality mentioned, and found a 

 good many young crickets and a few old ones. In 1896 it had 



