254 maine agricultural experiment station. i907. 

 Explanation of Plates. 



e 



It will be seen from the accompanying camera lucida draw- 

 ings that N. solanifolii is a fairly typical Xectarophora as 

 regards antennae. Although the number of sensoria varies 

 somewhat within the limits of each of the four forms, the seg- 

 ments figured are representative. The antennae of the apterous 

 viviparous and oviparous females most closely resemble each 

 other, segment III sometimes having 4 sensoria for each form, 

 though the number is more commonly as figured. The number 

 of sensoria is not constant for the winged viviparous form, 

 there frequently being a few more than occurred in the speci- 

 men drawn, but they are in all cases arranged in a somewhat 

 irregular row. As is usual for Aphididae the antennae of the 

 males are conspicuous for the great number of sensoria present r 

 giving a very uneven outline. Segment A* characteristically 

 bears sensoria not found in the other sex. Although the anten- 

 nae of the male are not actually so long as those of the females r 

 they are. relative to the total length of the body, much longer, 

 being in this sex more than twice the length of the body. 



Fig. 27, winged viviparous form, Antennal Segment III. 



Fig. 28, apterous " " " " III. 



Fig. 29, apterous oviparous " III. 



Figs. 30 and 31, winged male, Antennal Segments III, IV, Y. 



Fig. 32, viviparous form, Basal 2 /z of hind tibia. 



Fig. ^ oviparous " " % " " " 



