EMPOASCA FEAVESCENS 
197 
pouch measured .83 mm. by .18 mm. Ten egg pouches averaged 
.93 mm. by .27 mm. 
Nymphal stages. — No descriptions were made of the nymphal 
stages, although ' these were measured. The following lengths 
were taken: Stage I, 1.13 mm.; II, 1.62 mm.; Ill, 1.98 mm.; 
IV, 2.4 mm. ; V, 3.2 mm. 
THE INJURY 
The injury to the hop-trees consisted in the extraction of sap 
from the foliage. The upper surface of the leaves was irregularly 
mottled with many fine areas, paler in color than the rest of the 
leaf, indicating the necrosis of groups of cells within. There 
was no curling of the leaves as in the case of injury to apple 
foliage by Empoasca mail. The injury was similar to that caused 
by Empoa rosae to apple foliage. During every year for a period 
of eight years these leaf -hoppers were abundant on the hop-trees 
mentioned. By late summer they became so common that they 
would rise in veritable clouds when one passed by the infested 
trees. 
FOOD PLANTS 
Dr. Goding (1890) in describing Empoasca birdii (often con- 
sidered as a variety of davescens ) found that species on apple, 
hop, walnut, beans and “weeds” in Illinois. Van Duzee (1917) 
lists birdii as a distinct species. Forbes (1900) recorded Em- 
poasca davescens from sugar beet. Hawley (1918) collected 
specimens on plum in New York state. The present record on 
hop-tree (P tele a trifoliata) is therefore new. At Ames the leaf- 
hoppers have been literally swarming over the foliage of several 
of these trees during the summer and fall. A hop-tree at La- 
Fayette, Indiana, was found well infested with these leaf-hoppers, 
August 12, 1917, by the writer. 
AN EGG PARASITE 
In July, 1911, at Ames many parasitized eggs were found. These 
appeared darker in color than the others. Occasionally the form 
of a parasitic pupa was determined within an egg pouch and 
many leaf-hopper eggs had tiny circular holes in them, indicating 
that a parasite had already emerged. Some of these eggs were 
cut from the leaves and placed in vials to rear the parasites. 
Adults emerged during July and these were sent to A. A. Girault, 
for determination. Mr. Girault identified the species as Anagrus 
spiritus Girault. This species has also been reared from the San 
