28 
BEITISH APHIDES. 
sible, be made where any unusual distribution of the 
yeins may be noticed. 
The strongest nerve in the wing is styled the 
cubitus or post-costal nerve. It expands at its apical 
portion into the stigma, from which the fourth or 
stigmatic vein proceeds. 
As the section Aphididse possesses the most ela- 
borate venation of the Family, such a typical figure of 
a wing is subjoined as will comprise the genera it con- 
tains. In this manner it will be understood that the 
construction of the wings of other sections may depend 
a. Cubitus 
nervure. 
h. Posterior marginal. 
c. Costal nervure. 
d. Cubital nervure. 
e. First furcal. 
/. Second furcal. 
g. Second oblique. 
1i. First oblique. 
i. Insertions. 
h. Apical marginal. 
1. Stigmatic. 
p. Hooklet. 
1. Costal cell. 
2. Basal cell. 
3. First discoidal. 
4. Second discoidal. 
5. Infra-marginal. 
6. Marginal. 
7. Second cubital. 
8. First cubital. 
9. Stigma. 
A. Upper wing of Sipbonopbora. 
B. Lower wing, 
or post-costal 
N.B. — Tbe same letters apply to each wing. 
upon the suppression or modification of these ner- 
vures. 
Three oblique veins start from the cubitus or post- 
