10 THE FLORIDA ENTOMOLOGIST 
quite freely until a suitable place is found, but is very quiet while 
feeding. 
Third Instar. Eyes red. Body pea green. Body gradually 
becomes enlarged from the head almost to the cornicles at which 
point the abdomen tapers off to the cauda. Cornicles almost 
transparent with dark tips; dark greenish area between the 
cornicles. In the individuals destined to become winged the 
wing pads begin to develop. 
Fourth Instar. Similar to the third. Body slightly more en- 
larged. Last antennal segments dark. Cornicles about one 
third darkened. Wing pads more prominent. 
Fifth Instar. Color of head and thorax, amber. Abdomen light 
green. Eyes dark red. Antennae and wings whitish, as well 
as legs. Coxae dark. Wing pads, when present, very prominent. 
Distal half of cornicles darkened. Wings are rolled in a window 
curtain manner over dorsal side of body. After the skin is shed 
the wings, which have a silvery, crystalline appearance, gradually 
unfold and are spread out by the newly emerged adult to dry. 
HOST PLANTS 
In the field citrus has been found to be the most commonly 
infested, especially certain varieties of the mandarin family. The 
varieties of citrus were infested in the following order; those 
most heavily infested being placed first: King orange, Temple 
orange, Tangerine, pineapple orange, Valencia, and grapefruit. 
The writer also carried on experiments on many plants as 
hosts, both in the laboratory and in the field. In the field it was 
found on loquat, wild plum and sand pear, and in the laboratory 
we were successful in breeding it on night-shade, Jerusalem Oak, 
milkweed, dogfennel, cudweed; also on lettuce and peppers. At 
the present time, however, the writer is conducting his experi- 
ments most succcessfully on Chinese spirea, on which the insect 
in question seems to have all the habits and characteristics of a 
species on its native host. 
CHARACTER OF ATTACK 
This aphid, unlike any species which has heretofore been found 
on citrus, attacks the young tender succulent growth, and the 
blossoms, calyx and young fruit, as well as the shoots and water 
sprouts. The method of its attack on the foliage is also char- 
acteristic in that it shows a tendency to attack the mid-rib of 
the leaf together with its branches. As a result a few individuals 
soon cut off the source of food supply of a leaf, causing it to 
