18 
course The leaves curl up, and become matted around the curl so as 
to make a safe harbor for the lice-like larvae, which during the sum¬ 
mer, appear on the under surface of the leaves. I presume we can ge 
clear of this insect, after the larvae are produced, by cutting oft the 
curls and burning them.” 
Although neither of these species has been positively detected in Illinois, 
I have some reason to believe that the former or some closely allied spe¬ 
cies, appeared on fruit-trees in the vicinity of Chicago last year, 
tried, but failed, to procure specimens, so was unable to decide with 
certainty. 
The following species of this genus were described by Ur. Fitch, m 
1851, in a catalogue of the insects in the New \ ork Cabinet of Natural 
History. I give his descriptions as I find them as I am unacquamte 
with them. He appears to have been unacquainted with the habits oi 
the first two: 
7. Psylla tripunctata. Fitch. The three-dotted Psylla. 
Wax yellow, with black back; legs and antennae, pale yellow, the lat¬ 
ter black at the tips; the front wings transparent (hya me); nerves 
brown, widely margined with smoky yellow beyond the forks, a blackish 
dot on the middle of the terminal margin of each of the inner apical 
cells. Length .16 of an inch, female. 
8. Psylla quadrilineata. Fitch. The four-lined Psylla. 
Bright fulvous or yellowish; the front wings, hyaline; the nerves 
blackish; four whitish longitudinal hues on the middle of the hind 
thorax (metathorax); abdomen black with a yellow band at its base. 
Length, .12 of an inch. Female. 
9. Psylla carpini. Fitch. The Hornbeam Psylla. 
Light green or greenish yellow; fore wings, hyaline; nerves, light 
greem Length, .18 of an inch. Male and female. Common on the 
Hornbeam in July. 
10. Psylla annulata. Fitch. The Annulated Psylla. 
Straw yellow: legs, white; fore wings, hyaline, with the nerves straw 
yellow: antennae black, except the basal portion, which 18 straw yeiloiv, 
annulated with black. Length, .15 of an inch. Male and female. Oc 
curs on the sugar-maple. 
,1. Psylla urtieaecolens. The same author mention* 
with the above name occunng on the nettle. 1 have 
scription of this species. 
12. Psylla quadrnignata. This species is also mentioned by Walker 
but I have not seen the description. 
Mr. Walsh alludes to a Hlrris^aUudelTn- 
sacken, forming true galls o u which have the young 
JSffU acottony°'suhstance 1 , 1< S dustily’ the case in this genus. 
