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leaf-miner, another the nymph of a small tree-hopper, while in confine- 
ment nearly all the species will attack voraciously almost any small 
insect they can seize with their curved jaws. 
As no effort seems to have been made previously to identify the spe- 
cies of these important predaceous insects found on cotton, I give 
below the results of my work in this direction, believing it just as 
important to know the names of those insects beneficial to us as it is tol 
know those which are noxious or injurious. 
The eggs of all these species are laid in clusters on either the upper 
or lower side of a leaf, suspended on delicate threads, and might easily 
be mistaken for the spores of some fungi. All appear very much alike, 
and scarcely any specific difference can be detected between the eggs 
of the different species. 
The eyed lacewing ( Chrysopa oculata Say) is known at once by having 
a black ring on the second joint of the antennae, black antennal sockets, 
a broad black line below the eye, four black spots on vertex, and by 
the prothorax having three black points on each side. 
The white-horned lacewing (Chrysopa albicornis Fitch) agrees very 
closely with the previous species, but the first joint of the antennae is 
annul ated with sanguineous, the four spots on the crown conjoined and 
forming two black bands, while the prothorax has only one black point 
at the sides anteriorly. 
The black-horned lacewing (Chrysopa ?iigricornis Burin.) resembles 
somewhat the preceding, but with the head without black marks or 
lines, except one on each side of the clypeus and sometimes a line or 
spot beneath the eye ; the first and second joint of the antennae are 
pale, not annulated with black or sanguineous, the flagellum being black 
at basal one-third, while the prothorax usually has a black point at 
the anterior angle, although sometimes wanting. 
The stripe-horned lacewing (Chrysopa lineaticornis Fitch) is closely 
related to C. nigricornis Burm., but has the basal joint of antennae with 
a black or dusky line above, the prothorax with a fuscous line along 
the sides, while the head is spotted with fuscous anteriorly. 
The slender lacewing (Chrysopa attenuata Walk.) is a pale greenish- 
yellow species and the form most commonly met with on cotton, all the 
veins of the wings being pale green, more rarely with some of the veins 
obscured or dusky, the head with a sanguineous line below the eyes and 
with the palpi varied with fuscous or black. 
ORDER PLATYPTERA. 
The insects belonging to the family Psocidae are more or less social 
in their habits, especially at the approach of cold weather, and when 
immature resemble the biting lice or Mallophaga. They are scaven- 
gers, feeding upon decomposing animal and vegetable matter and upon 
fungi. 
