No. 402.] THE VENATION OF TRIMEROTROPIS. 481 
of the genus merely serve to strengthen the conclusion just 
formulated, and, except in the number of branches of radius in 
the tegmina and wings, are greater than normally occur in the 
subfamily. 
3. Variation affects chiefly the veins R., M., and Cz. in the 
tegmina, and R., and M. in the wings, and these on the outer 
half of the wings only. 
4. Variation in venation is more frequent in the tegmina 
than in the wings. 
5. When the tegmina are widened, new veins are supplied 
by accessory branches of R., and Cz.,. 
