STATE AGRICULTURAL SOCIETY. 
471 
CHESTNUT. LEAVES. 
wings clear and glassy with a blackish spot on their tips and 
another on the base which is often prolonged along the middle of 
the wing and united with the hind spot. Length of the male 
0.25, female 0.30. This is a common insect on chestnut leaves 
in the month of July, and I have never met with it upon any 
other vegetation. 
xos. Unadorned tree-hopper, Smilia inornata, Say. 
A tree-hopper of the same size and shape with the preceding, 
but of a light green color fading to light yellow, with a slender 
black line along the upper edge of its back and a very slight 
duskiness on the tips of its glassy wings. This is quite common 
on the chestnut and on oaks from the beginning of July till the 
last of September. 
The Unarmed tree-hopper No. 64, is also met with on the 
chestnut in May and July, and at first sight appears identical 
with the preceding species. It may be distinguished from it by 
the hind end of its thorax, which is drawn out into a slender, 
sharp point, and its breast, which is black. 
199 . Chestnut gay-louse, Callipterus Costarica, new species. (Homoptera. 
Apliidae.) 
On the under sides of the leaves, puncturing them and sucking 
their juices in August and September, a small sulphur-yellow 
plant-louse, with black shanks and feet, its antennae also black 
except at their bases and as long as the body, its wings pellucid, 
their first and second oblique veins and the tip of the rib-vein 
edged with coal-black, and its thighs straw-yellow. Length 0.09, 
to the tip of the wings 0.15. 
This insect, in company with wingless larvae and pup® of the 
same color, may frequently be met with upon the under sides of 
chestnut leaves. The name “ gay-louse,” which is of the same 
import with the generic term Callipterus, and is the equivalent of 
the German name zierlaus which Koch applies to these plant lice, 
will be the most appropriate designation which our language fur¬ 
nishes for this and the other species of this genus, several of 
which have already been noticed in the preceding pages, (No. 20, 
167-171.) Their bright, lively colors, and their long, slender 
