IOWA ACADEMY OF SCIENCES. 
161 
In the male the ventral plate is rounded, deeply lobed poster-, 
iorly. Dorsal plate longer than the claspers whose rounded 
bases are received in the lobed portion of the ventral plate, 
then constricted above this and again enlarged, roundish, 
having a distinct inward curve posteriorly and a similar one 
dorsally, thus making the upper posterior corners quite promi- 
nent and roundish. The upper anterior corners extend forward 
as roundish lobes which reach over half way to the dorsal plate 
and have numerous strong, slightly curved, spine-like projec- 
tions. Their dorsal edges are sharp, turned inward, black, 
and apparently chitinous. 
This species was first noticed June 17, 1894, on Amorjilm fruti- 
cosas. At this time it was in the adult stage and depositing 
eggs very abundantly on the under side of the leaves, especially 
near the ends of the branches where the leaflets were as yet^ 
quite closely clustered together. Although many eggs were 
deposited, for some reason only a few larvae could be found. It 
was thought probable that some predaceous insect devoured 
the eggs; but careful observations failed to disclose any such 
insects. Egg parasites were also suspected, but could obtain 
no definite proof. This fact of sudden disappearance was also 
very noticeable in the Hackberry PsylUdce. In the season of 1892 
the latter were very abundant and numerous parasites were 
found. In 1893 they were very abundant, and the parasites 
somewhat more numerous. In 1894 the Psyllidoe were very 
scarce, many eggs having been deposited early in the spring, 
but very few galls formed. In this case the chalcids (probably 
Encyrtus Pachypsyllce) were prominent factors. The history of 
the case as just stated is more in accord with the general 
record of parasitism. One fact that makes it easier to trace 
the parasites in galls is that they are enclosed by the gall, thus 
preventing their dropping from the leaves, as is probably the 
case with the non gall-forming species. 
TRIOZA SALICIS, Sp. nOV. 
Pound on Willow, {Salix sp.) 
Description . — General color orange yellow, somewhat lighter 
underneath, the abdomen in some cases is of a light green color 
ventrally. 
Ground color of head yellow, somewhat lighter than the 
rest. Vertex, including the lobes and posterior part of head, 
which is only narrowly visible from above, black, shining. Eyes 
