g2 JOURNAL AND PROCEEDINGS. 
Entomologists class the Psylla as belonging to the family Psyl- 
lidee, or Jumping Plant Lice, under the sub-order Homoptera. The 
general name Psylla is derived from the Greek word meaning a Flea. 
In Europe there are three species which infest the pear tree, and our 
species, Pyricola, is not the worst. Let us hope. therefore, that its 
relatives may never reach us. 
Among the indications of its presence are the following : 
The old trees will be observed to make little new growth; new 
shoots droop and wither in May as if from loss of sap. A little later 
the old trees put on a sickly appearance ; the leaves will turn yellow, 
and the fruit grow but little, and about midsummer most of the 
leaves and half formed fruit will fall from the trees. Besides this 
the insect secretes a large amount of honey dew which covers the 
twigs, trunks and branches of the trees after the leaves expand, as 
is found throughout the season. At first this substance is clear like 
water, but soon assumes a disgusting blackish appearance, owing to 
the fungus growth within it 
Mr. Slingerland visited Mr. Wright’s orchard at Ithaca, in the 
latter part of November, 1891, and states that the whole orchard 
appears as if a fire had swept quickly through it, scorching trees and 
blackening trunks, large branches and the smallest twigs. The 
Bartlett and Duchess varieties suffered the most. 
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The insect may be perhaps recognized from the following 
points of description, together with the accompanying illustrations : 
Fig. 1 represents the nymph or immature forms when first 
hatched. They are translucent yellow in color, and hardly visible 
to the naked eye, eighty of them placed end to end would scarcely 
