affecting the Corn- Crops. 
517 
They are believed to be hermaphrodite. 
The more matured grains contain innumerable egcrs with from 
one to tliree worms only in each. 
The eggs are laid in strings of five or six together, and the young 
worms can be seen through the skin. 
llie young worms hatch about an hour and a half after the eggs 
are laid, when put in water, and they are almost as long in extri- 
cating themselves. 
Explanation of Plate N. 
Fig. 1.* Platygaster Tipula, male. 
a The natural sizCi 
h* The antenna. 
Fig. 2.* Platygaster insercns. 
e The natural length. 
c* The abdomen and ovipositor. 
d* The antenna. 
Fig. 3 * Macroglenes penetrans, male. 
f The natural dimensions. 
Fig. 4.* Macroglenes penetrans, female. 
g The natural size. 
Fig. 5.* Empis lirida, female. 
m The natural dimensions. 
Fig. 6.* Head of the same in profile. 
/t* The two antennae. 
i* The upper lip. 
k* The under lip. 
/* The Palpi or feelers. 
Fig. 7. Portion of a stem of barley exhibiting 
0 Larvae of tlie Thrips. 
p The Thrips itself. 
Fig. 8.* Thrips cerealium, female. 
q The natural size. 
Fig. 9.* The same flying. 
n The natural size. 
Fig. 10.* Aphis granaria, male. 
r Natural size, walking. 
Fig. 11.* An apterous larva. 
s The natural size. 
Fig. 12.* Aphidiiis Aventp, male. 
t The natural size. 
Fig. 13.* Case of Aphis graiiaria, female, from wliicli the Aphidius 
had hatched. 
u The natural size. 
Plate O. 
Fig. 14.* Miris Tritici, male. 
V The natural length. 
