CONTENTS. 
Page. 
Explanatory to the new series 4 
The Aphelinina* of North America 5 
Host relations of species here treated 11 
Analysis of the genera 14 
Genus Eretinocerus 15 
« Pteroptrix 17 
Mesidia 19 
Centrodora 19 
Perissopterus 20 
Aphelinus 23 
Plastocharis 27 
Encarsia 28 
Aspidiotiphagu.8 30 
Coccophagus 31 
Prospalta 39 
Ablerns 42 
Physcns 43 
3 
