SOME NOTES ON BMPOASCA F LAV BSC BN S 
FABRICIUS 
. ( HOMOPTBRA , CICADBLLIDAB ) 
R. L. WEBSTER 
In the fall of 1910 my attention was called to the abundance 
of this leaf-hopper on certain trees of Ptelea trifoliata on the Iowa 
State College campus at Ames. Some notes on the insect were 
made that fall and also in the two years following. Practically 
nothing has been known concerning the life history of this in- 
sect ; hence this paper. The notes are from the files of the ento- 
mological section of the Iowa Agricultural Experiment Station. 
In order to obtain an authoritative identification, adults were 
submitted to Professor C. P. Gillette, Colorado Agricultural Col- 
lege, who kindly determined these as Bmpoasca Havescens Fabr. 
LIFE HISTORY 
Hibernation. — This insect evidently hibernates as the adult, as 
indicated by Forbes (1900). October 29, 1910, I found adults 
among dead leaves around trees that previously were badly in- 
fested. Adults were not found in the early spring at Ames; 
Forbes, however, records them as early as April 20, in Illinois. 
Hawley (1918) reports adults in May in New York state, indi- 
cating hibernation. 
April'21, 1911, a twig of Ptelea trifoliata from a tree badly in- 
fested the year before, was placed in water in the insectary to 
determine whether nymphs might hatch from possible eggs in the 
bark. Neither eggs nor nymphs were found. It was thought 
that eggs may be placed in the bark, as with Bmpoa rosae on 
apple. 
Generations. — The earliest date I have seen the insect on the 
hop-tree in spring is June 5. Young nymphs and a few adults 
were found to be rather common on that date, but no eggs. Dur- 
ing the summer eggs were found commonly, deposited in the 
tissue of the leaves. July 10, all stages were present, eggs, 
nymphs, and adults. Considerable injury was evident. An ob- 
servation July 25, 1911, seems to indicate that a new generation 
was then coming on. The species was present mostly in the egg 
