REPORT OF NEW JERSEY STATE MUSEUM. 



Family PSYLLID'yE. 



Commonly known as "jumping plant lice" from their active habits, but 

 really resemble much more closely a miniature Cicada in appearance. 

 Both pairs of wings are transparent as a rule and the 

 antennae are quite long, thus differing from the leaf 

 and tree-hoppers to which in some other respects 

 they are similar. 



Some of the species produce galls, while others 

 feed exposed on the foliage. Our only injurious 

 species is the "pear psylla," which not only punctures 

 the leaf and fruit stalk, exhausting the juices, but 

 also excretes a honey dew in such great quantity as 

 to coat the leaves and form a foundation for the de- 

 velopment of a black fungus that covers both leaves 

 and fruit and checks development. The insect hiber- 



Fig. 39. Pear psylla; 



nates as an adult in bark crevices and under bud winged adult; 



scales, and a thorough spraying just before the buds enlarged. 



open, with one of the miscible oils diluted no more 



than nine times, will kill most of the specimens in 

 their winter quarters. Summer applications are not 

 nearly so effective, because the young are often cov- 

 ered by a frothy secretion and the adults fly readily 

 to avoid the spray; but a strong kerosene emulsion 

 is sometimes a great help in reducing numbers. 



There has been little collecting in this family since 

 the last edition was published and the present list 

 stands now much as it did then, as Mr. Schwarz 



\ 



Fig. 40. Appendiculate 

 eggs of Psylla; much left 

 enlarged. 



Sub-family 



LIVIA Latr. 



L. maculipennis Fitch. Staten Island VI, 13, Jamesburg VII, 13 (Ds). 

 L. vernalis Fitch. Common throughout the eastern United States on 

 Juncus sp.; imago in winter on pine trees. 



Sut>family APHALARIN^E. 



PSYLLOPSIS Loew. 



P. fraxinicola Forst. Atlantic City on "Fraxinus excelsior" (C V. R). 

 Imported from Europe and quite injurious to ash trees (Sz). 



APHALARA Forst. 



A. calthea Linn. New Brunswick VII, 27 (Sm), on "Polygonum hydro- 

 piper" (Sz). 



A. sp. nov. Sz. Anglesea V, 28 (Sm), on Solidago throughout the State 

 (Sz). 



