264 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Genus Chermaphis. 



abietis Linn. 



Abies nigra Michx. 

 Picea sp. 

 castanea Hald. 



Castanea sp. 

 laricifolias Fitch. 



Larix americana Du Roi. 

 laricana Du Roi. 

 pinicorticis Fitch. 



Pinus strobus L. 

 strobilobius Kalt. 



Larix americana Du Roi. 

 Genus Cladobius Koch, 

 bicolor Oestl. 

 Salix sp. 

 flocculosus Weed. 



Salix sp. 

 populeus Kalt. 



( Host unknown.) 

 salicis Linn. 

 Salix alba. 



longifolia. 

 lucida. 

 viminalis. 

 sp. 

 Populus balsamifera candicans. 

 salicti Harris. 

 Acer sp. 

 Populus sp. 



monilifera. 

 Salix sp. 

 smithiae Monell. 



Salix alba, 

 sp. 



Salix sp. 

 Genus Colopha Monell. 



eragrostidis Middleton. 

 Panicum sp. 



Eragrostidis poeaoides megastachya. 

 franheulin. 

 purshii. 

 frankii. 

 ulmicola Fitch. 



Ulmus americana and racemosa. 



Genus Drepanosiphum Koch, 

 acerfolii Thos. 



Acer dasycarpum. 

 saccharium. 



