46 Trans. Acad. Sci. of St. Louis. 



E. galioMus (Can.) — Galium verum L., G. lucldum All. 



E. artemisiae var. subtilis (Nal.) — Artemisia campestris L., A. vul- 



garis L. 

 E. centaureae (Nal.) — Centaurea amara L., C. maculosa Lam., C. sca- 



biosa L. 

 E. oleivorus Ashmead — On orange and lemon. 



Phyllocoptinae. 



PHYLLOCOPTES Nal. 



Ph. duMus (Nal.) — Avena pratensis L., Bromus arvensis L., B. errectus 

 Huds., B. mollis L., B. sterllis L., Dactylis glom- 

 erata L. 



Ph. comatus (typlcus) Nal. — Corylus avellana L., C. a. var. fol. lasc. 



Ph. reticulatus Nal. — Populus alba L., P. tremula L. 



Ph. magnirostris Nal. — Salix fragilis L., S. purpurea L., S. alba L. 



Ph. parvus Nal. — Salix alba L., S. purpurea L., S. sp. 



Ph. eurynotus Nal. — Torills infesta Curt., T. anthriscus (L.). 



Ph. schlcchtendali Nal. — Pirus malus, P. communis L. 



Ph. fockeui Nal, & Trt. — Prunus cerasus L., P. domestica L., P. ma- 



haleb L. 



Ph. cytisicola Can. — Cytisus nigricans L., C. laburnum L. 



Ph. anthobius Nal. — Galium sllvaticum L., G. uliginosum L., G. verum L. 



EPITRIMERTJS Nal. 



E. salicobius (Nal.) — Salix alba L., S. fragilis L. 



E. heterogaster (Nal.) — Clematis recta L., C. clrrhosa, C. alplna (L.). 



E. trilobus (Nal.) — Sambucus nigra L., S. racemosa L. 



OXYPLEUKITES Nal. 

 O. carinatus (Nal.) — Aesculus hippocastanum L., A. rublcunda Lois. 



Of about 250 known species of the Eriophyidae I have 

 listed 59 that have been recorded from more than one host 

 species. Of these 59, 50 are found only upon species of 

 the same genus and the remaining 9 are found only upon 

 closely related genera. Thus Eriophyes tenuis (Nal.) is 

 found only on members of the grass family, E. drabae 

 (Nal.) only on members of the mustard family, and E. 

 piri (Pgst.) Nal. only on related genera of the rose family. 



