﻿The Stylopidae parasitize very diverse gTOiips both in the 

 Jassid and Fultjorid series. The little Elciichus seems to attack 

 the Delphacidae in all localities, where these have been specially 

 examined, and the specific characters of these parasites seem to 

 be almost if not quite identical in widely separated countries ; at 

 least there is very little if any real difiference between Elencliiis 

 tenuicornis of Europe and the examples found in Australia, Viti, 

 and North America, that I refer to it. It is proper to state in this 

 connection that one of the species of Libnrnio attacked by Elen- 

 cliHS is found to be itself common to both Australia and North 

 America and it would not be surprising to find that it also inhabits 

 Europe, where, in any case, there are very closely allied species. 



The Chalcids seem rarely to attack hoppers, after they leave 

 the egg, but in Australia are two fine species of Encyrtidae, 

 Mciii'SCoccphalus c.viiiiiiis and Ncocladia hoivardi, which are bred 

 from nymphs or adults of a Jassid (Enrinoscopus), and recently 

 ]\[r. Aluir has bred the latter parasite from quite another Jassid 

 in China. Recently from a Jassid nymph in Arizona Mr. Koebele 

 bred another distinct form of Encyrtid, described in this bulletin 

 under the name Thysanomastix Koehclci. This species differs 

 in habits from the others above mentioned, in the fact that several 

 of the parasites emerged from a single host, and it is remarkable 

 that the latter (Oncomctopia lateralis) survived its injuries for 

 several days after their emergence, when one considers the size 

 of the parasites. 



Of predaceous insects it may ])e noticed in passing that the 

 larvae of various Alalachiid beetles, both in America and Europe, 

 destroy the Delphacid hoppers that live on grasses, and some 

 of them appear to be very voracious, so that on one occasion, 

 'Sir. Koebele had many parasitized leaf-hoppers destroyed by these 

 beetle larvae, accidentally included in his breeding jars. 



Of the parasites enumerated in this Bulletin, it was not attempt- 

 ed to introduce any into the Hawaiian islands, excepting the 

 minute egg-parasite, Tricho gramma hclocharac. An attempt was 

 made to breed this on the eggs of PerkinsieUa, but, as Mr. Koebele 

 and mhself had expected, without success. I was. however, able 

 to establish it at large on the eggs of a common introduced Jassid, 

 and have, since it was liberated some six or nine months ago. 

 frequently met with it. The fact that Jassid leaf-hoppers abound 

 in cane fields of other countries whence cane has frequently been 

 imported into these islands, while in the event of any of these 

 showing up here, we have practically no natural enemies which 

 would destrov them, made it worth while to establish the Tricho- 



