326 ENTOMOLOGICAL SOCIETY 



locusts, &c. ; the tribe Telenomini destroy lepidopterous, 

 hemipterous, dipterous, and neuropterous eggs ; the tribe Baeini, 

 spider eggs ; the tribe Teleasini, beetle eggs ; while the family 

 Trichogrammidae destroy the eggs of moths, butterflies, beetles, 

 bugs, &c. The species belonging to the genus Evania in the 

 family Evaniidae destroy the eggs of cockroaches ; while some 

 Chalcidids are also egg-destroyers, species of Encyrtus and 

 Anastatus (= Antigaster). 



The tribe Bethylini in the Proctotrypidae are parasitic on the 

 larvae of the Micro-lepidoptera and on coleopterous larvae ; the 

 subfamily Dryininae on homopterous larvae ; the subfamily 

 Platygasterinag on dipterous larvae ; the subfamily Helorinae on 

 neuropterous insects ; the subfamilies Proctotrypinas and Belytinac 

 on coleopterous larvae ; while the Diapriinae attack dipterous 

 larvae. 



The parasitic Cynipidae attack principally dipterous larvae, 

 although one subfamily, the Allotriinae, destroy plant-lice belong 

 ing to the homopterous family Aphididae. 



The species belonging to the families Chalcididae, Braconidae, 

 and Ichneumonidae, comprising thousands and thousands of 

 species, destroy the larvae, pupae, and imagoes of nearly all 

 orders. 



And we find in these families, just as we have found to be the 

 case in the Proctotrypidse, whole tribes and genera with a unity 

 of habit that is universal. The genera Bracon, Spathius, 

 Meteorus, Euphorus, Ichneumon, Pteromalus, Eupelmus, Aph- 

 elinus, Coccophagus, Tetrastichus, Melittobia, etc., have the 

 same habits in Europe, Asia, Africa, or Australia as they have 

 in America ; and I hope to see the knowledge we are acquiring 

 of these parasitic insects put to practical use. 



I hope to live to see these parasites bred in great numbers in 

 the laboratory and then transported into regions where they do 

 not exist and where they will do the most good, in destroying 

 their destructive insect hosts. 



There is no reason why we cannot send our American para 

 sites to other countries and receive in return other parasites not 

 in our fauna. 



Some of our most destructive insect pests were imported from 



