ENTOMOLOGY'. 



259 



discovered were, among the hymenopterous primary parasites, Amor- 

 2>hot« orgyice, Apanteles delicatus, and Pteromalus cuproideus, and among 

 the hymenopterous hyperparasites, Bathythrix meteori, B. pimpla', 

 Adistola amerieana, Pezomachus insolitus Eupelmus limner ice, and Elas- 

 mus atratus. 



After the introduction, of which the above is a summary, the author 

 considers in detail the various species of parasites noted and gives, in 

 his concluding remarks, the following table, which shows the host rela- 

 tions of the hymenopterous parasites, so far as they are known or 

 surmised : 



Host relations of the hymenopterous parasites of Orgyia leiicostigma. 



The dipterous parasites were not found to be hyperparasitized. 



The economic importance of the parasites of the tussock moth, as 

 shown by the numbers that issued from 024 cocoons, may be readily 

 determined from the following, in which the figures denote the number 

 of specimens of the species obtained : Pimpla inquisitor 729, Chalets ovat't 

 09, Dibrachys boucheanus 50, Euphorocera claripennis 15, Frontina 

 frenchii 14, Bathythrix pimpla' 13, Tachina mella 12, Frontina aletiw 7, 

 Exorista griseom ica ns 1, Limneria valida 1, Theroniafulvescens 1, Asecodes 

 albitarsis 1. Breeding cage experiments showed the actual percentage 

 of parasitism to be above 98 per cent. Later on in the season of 1890 

 the presence of the hyperparasites became more manifest, and many 

 hundreds of Dibrachys boucheanus were reared from the cocoons of the 

 Pimpla. Tertiary parasitism was found to be comparatively rare. 

 7292— No. 3 5 



