THE ENTOMOLOGIST. 69 



P. Salicis (= Tridymus or Seladerma or Selaoderma), in 

 willow-galls of Cecidomyia Salicis, where Encyrtus Tennes 

 and Platygaster niger are its corapanions. P. Puparura, 

 Linn, the well-known destroyer of European butterflies in the 

 chrysalis state ; it also occurs in various parts of North 

 America, and as far north as Hudson's Bay. Chrysolampus 

 suspensus (= Cor3'na clavata) lives in the larvae of Aphidius 

 Eosaruni, and is thereby an injurious insect. Elachistus 

 albiventris, in larvae of Noctuites [e.g. trapezina), Eulophus 

 rainicornis, in larvae of Noctuites {e. g. Aceris), E, pecti- 

 nicornis, in subcutaneous larvae of oak-leaves. E. pennicornis, 

 in larvae of Plusia Gamma. E. Larvarura, Linn., in larvae of 

 Noctuites [e. g. Aceris) ; various species have been described 

 by various authors under this name, and Nees observes that 

 it is a most obscure species. E. abdominalis, in larvae of 

 N. pyramidea. E. Gallarum, Linn., in larvae of Cynips 

 Quercus-ramuli, the originator of oak-apples. E. Roesellse, 

 in larvae of QKcophora Roesella. E. exiguus, from " folliculi," 

 on Fesluca ovina. Encyrtus scutellaris, in Cocci of Betula 

 alba and of Prunus. E. varicornis, in larvae of Eumenes 

 coarctata. E. scutellaris, in Cocci of Corylus Avellana and 

 of Acer platanoides, &c. E. gravis, in eggs of Lepidoptera ; 

 Nees observes that it may be also a parasite of Cocci, and 

 that it is identical with Ichneumon Coccorum, Linn., and 

 with E. aeriiginosus, var. ^., Dalm. E. aeruginosas, in Cocci 

 of Prunus. E. zephyrinus, in Cocci of Betula alba. 



When types of descriptions of species are not accessible, 

 and when these descriptions will answer for two or more 

 species, the record of the parasitism may be of much service 

 as a proof of identity ; when this help is wanting it may 

 chance that a name, to use the words of Nees, " obscurum est 

 semperque manebit." The few following species are noticed 

 by Nees in the supplement to his work. Callimome 

 aurulentus, in galls of Cecidomyia on Rhamnus Alaternus. 

 C. cyaneus, Fonsc, in galls on Cornus sanguineus. C. sap- 

 phyrinus, Fonsc, in galls of Eryngium campeslre, in galls of 

 the rose, and in larvae ; it may be a compound species. 

 Monodonlomerus obsoletus, in pupae of Lepidoptera, and in 

 nests of bees. Eupelmus Syrphi, Bouclie, in pupae of 

 Syrphus Ribesii and of S. balteatus. Ormyrus brevicauda, in 

 galls of Cynips Potentillae. Pleromalus Larvarum, in larvae 



