Puant Lice InsurinG FoLIAGE AND FRUIT OF THE APPLE 715 
is lacking and the lice are from bright rusty yellow to yellow in color. 
Dark spots scattered over the dorsum of the abdomen are not uncommon. 
The head is dusky brown to yellowish; the distal half of the antenna is 
dusky to black, the proximal part is yellow; the legs are yellowish, with 
the distal ends of the femora, the tibiae, and the tarsi black; the cornicles 
(fig. 117, a) are black, cylindrical, gradually tapering toward their distal 
Fig. 118. ANTENNAE OF VARIOUS FORMS 
A, Aphis pomi, oviparous female; B, A. sorbi, oviparous female; C, A. avenae, oviparous femz> 
, A. pomi, male. All drawn to same scale. 
ends, which are slightly flanged; the cauda is prominent and black; the 
segment directly in front of the subgenital plate is marked with two 
prominent oval black spots, one on each side of the median line. The 
length and number of sensoria of the antennal segments (fig. 118, a) are 
as follows: Segment III, 0.22 mm., sensoria 0; Segment IV, 0.15 mm. 
sensoria 0; Segment V, 0.16 mm., sensoria 1; Segment VI, 0.8+0.23 mm., 
sensoria the usual group. 
