NOTES ON NORTH AMERICAN PSYLLID^. 

 By C. V. Riley, 



(Read May 25, 1883.) 



Having been engaged lately in putting together the material for 

 a study of the Psyllidse of North America, I would, in this brief 

 paper, offer a preliminary statement of some of the results, and 

 append a few descriptions of the more remarkable forms for pub- 

 lication in the proceedings. 



Knowledge of the European Psyllidaa has greatly advanced, both 

 as to morphology and biography, since the time of Linngeus and 

 Latreille, mainly through the labors of Hartig, Forster, Flor, 

 and more especially, in recent years, through the important publi- 

 cations of Dr. Franz Low, of Vienna. The Psyllid fauna of the 

 United States has, however, received little attention from American 

 entomologists ; yet it is rich in species which are of great interest. 



What has hitherto been done in the classification of the North 

 American Psyllidae may be gathered from the following list of the 

 species actually described. A similar list was published in the 

 " Canadian Entomologist " by Mr. Wm. H. Ashmead, (1881,) but 

 it was somewhat incomplete, and contained some inaccuracies. 



1. Diraphia vernalis Fitch. 



2. Diraphia femoralis Fitch. 

 5. Diraphia calainorian Fitch. 



4. Diraphia maculipennis Fitch. 



5. Aphaiara arctica Walker. 



6. Psylla ilecis Ashmead. 



7. Psylla rhois Glover. 



8. Psylla quadrilitteata Fitch. 



9. Psylla carpini Fitch. 



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