of leaf-hopper, and the burning of trash aggravates the dilTi- 

 culty. As an offset to these conditions new fields should l)e 

 supplied artificially with natural enemies, and they should he 

 supplied as soon as any leaf-hopjiers enter them. Of course 

 future observation may prove this di.stril)ution unnecessary, l)ut 

 for the present it should be adopted. 



LIST OF rWRASlTES AND THEIR HOSTS. 



Helcnv are listed the j^arasites and hyperparasites treated of 

 in detail in the various parts of this Ijulletin. In man} cases it 

 is not possible at present to give the exact host of each para- 

 site, even though the latter was bred. In the first place, of the 

 great number ijf species of leaf-hoppers collected 1)\- us in ,\us- 

 tralia, only about half are yet described, and in the second, 

 many of the parasites were obtained only from n\niphs, which, 

 in the present state of knowledge, even the special student of 

 Homoptera will probably be at a loss to refer with cerlaintx l<i 

 their proper species. The name "Liburnia," often cited l)elo\v 

 as a host, huist be regarded in a ver\ wide sense, somewhat as 

 in Edwards' 'T^ritish Homo])tera,"" where it includes a number of 

 recognized Euro])ean genera. Ai)])lie(l to the Australian forms 

 in the list ])elow, it is likewise a conijiosite genus, the compo- 

 nents of which do not however, at least as a rule, agree with 

 those in the work just mentioned. In this list of hosts, the 

 leaf-hop]:)ers have mostl\- been determined 1)\ Mr. Kirkaldy. bill 

 for the reasons given, comparativel)- few are referred to s])eci- 

 fically. Conse(|uently it is not necessarv. nor ad\isa])le. at i)res- 

 ent to make a second list, giving first i)lace to the hosts, though 

 1 hoi)e that this ma\' be done, when the working out of the 

 Homoptera is completed. In the case of the Dryinidae I have 

 listed all the species dealt with in this lUdletin. since onlv seven 

 of the 65 have not l)een l)red, and attention is thus called to 

 those species about which information is wanted. 



H ] 'MEN OP TERO US PA RA SITES. 



FAM. DRYINIDAE. 



Parasite Host. 



Pseudogonatopus 



kurandae Liburnia s]). nymph and adult. 



juncetorum Liburnia and other Delphacids, nymphs 



end adults. 



