JUMPING PLANT-LICE. 141 
Psylla rubi W. & R. (The Blackberry Flea-louse). 
This small jumping plant-louse, about one-eighth of an inch 
in length, is reported as common on blackberry leaves. Here it 
curls the leaves, which should be gathered and burnt, as other- 
wise they offer safe harbors for their larve, which can be found 
hiding in them during the greater part of the summer. 
P. tripunctata is a wax-colored species with three brown 
curved streaks, and three darker spots near the posterior margin 
Fic. 132a—Pachy-psylla venusta O. S. a, gall fully formed; b, same forming; c, 
per rien of same, natural size. After Riley, Div. of Entomology, Dep. of Agri- 
culture. 
of the wing-covers. It thrives upon the leaves of the blackberry, 
which it causes to wrinkle and purse, while it is equally common 
among the needles of pine-trees. (Uhler). 
A number of gall-forming jumping plant-lice occur upon the 
hackberry tree, a tree of very graceful appearance, very hardy, 
and one that should be more frequently planted for shade and 
ornament in our state, where it is native. Some of the little 
gall-makers are beautifully marked. 
