INSECTS INJURIOUS TO THE APPLE AND PEAR 533 



of the abdomen being dark reddish-brown, and covered with a 

 powdery substance which gives it a deep blue color, the middle 

 of the abdomen being lighter yellowish. The antennae and legs 

 are whitish, marked with dusky. The honey-tubes are pale yellow, 

 tipped with black, and are long and tapering. Between the eyes 

 are two small tubercles, and on the middle of the two segments 

 in front of the tail are a pair of similar small tubercles, which 

 are quite characteristic of this species. When fully developed 

 the female becomes much darker and distended with young, which 

 may be seen through the abdomen. The winged female is about 



FIG. 462. The rosy apple-aphis (Aphis sorbi Kalt.}: winged viviparous 

 female greatly enlarged. 



the same length, the head, thorax and honey-tubes being black, 

 and the abdomen yellowish-red. The winged females in the fall 

 differ from those of the spring in lacking the small tubercles 

 between the eyes, but both spring and fall winged females have 

 the two pairs of small tubercles in front of the tail. They also 

 differ in having a large black splotch on the centre of the abdomen, 

 bands across the terminal abdominal segments, and spots along 

 the sides, also black. The male is winged and similar to the winged 

 viviparous females which migrate back to the apple in fall. 

 The egg-laying females are wingless, very much smaller than 

 the summer forms, and light lemon-yellow in color. 



