252 KANSAS UNIVERSITY SCIENCE BULLETIN, 



Trifolium sp. 



Callipterus trifolii Monell. 



Geoica squamosa Hart. 



Macrosiphum pisi Kalt. 

 Tulipa gesneriana L. 



Macrosiphum tulipie Thos. 



Rhopalosiphum dianthi Schrank. 

 tulipae Thos. 

 Tulipa. 



Macrosiphum tulipse Thos. 

 Typha latifolia L. 



Rhopalosiphum dianthi Schrank. 

 Ulmaria ulmaria L. 



Macrosiphum pisi Kalt. 

 Ulmus americana L. 



Callipterus ulmifolii Monell. 



Colopha ulmicola Fitch. 



Pemphigus walshi Will. 



Tetraneura ulmi De G. 



Schizoneura americana Riley. 

 Ulmus pubescens Walt. (U. fulva). 



Pemphigus ulmi-fusus Walsh. 

 Ulmus racemosa Thos. 



Colopha ulmicola Fitch. 



Ulmus rubra (U. fulva Michx). 



Callipterus bella Walsh. 



Chaitophorus quercifoliae Thos. 

 Ulmus suberosus. 



Tetraneura ulmi De G. • 

 Ulmus sp. 



Lachnus ulmi L. 

 Urtica dioica Pursh. 



Macrosiphum pisi Kalt. 

 Urtica gracilis Ait. 



Macrosiphum pisi Kalt. 

 Valeriana edulis Nutt. 



Aphis valerinse Cowen. 

 Veratrum californicum Durand. 



Aphis veratri Cowen. 

 Verbena sp. 



Macrosiphum verbenae Thos. 

 Vernonia fusciculata Michx, 



Aphis middletoni Thos. 

 vemoniae Thos. 



Macrosiphum rudbeckiae Fitch. 

 Vernonia lindheimeriana Eng. & Gray. 



Macrosiphum rubeckias Fitch. 

 Vernonia novseboracensis L. 



Macrosiphum rudbeckiae Fitch. 

 Vernonia sp. 



Aphis middletoni Thos. 



