Feb. 21 , 1916 
Green Apple Aphis 
985 
VI, base 0.08 to 0.096 mm.,tuiguis 0.192 to 0.256 mm.; segment V with a distal senso- 
rium, segments III to V imbricated and with a few prominent spines. Compound eyes 
large and with very many facets. Cornicles cylindric, 0.161 mm. long, imbricated. 
Legs slender, hind tibiae 0.537 mm. long. Cauda conical, this and the anal plate 
densely setose. 
Color characters: Approaching those of the adult, the dark green transverse band 
apparent in some cases, and the black portions more strongly developed than in the 
previous instar. 
Fifth instar (adult). —Morphological characters: Antennae as follows: I, 0.064 
mm.; 11,0.064 mm.; Ill, 0.176 to 0.192 mm.; IV, 0.112 to 0.16 mm.; V, 0.144 to0.176 
mm.; VI, base 0.096 mm., unguis 0.24 to 0.288 mm.; segments III to VI imbricated 
and with a few rather prominent spinelike hairs, without sensoria excepting the 
usual distal one on V, and the sensory group at base of unguis. Vertex very slightly 
rounded. Compound eyes large, with distinct ocular tubercles; prothoracic tuber¬ 
cle very large and distinct; abdominal tubercles small with the exception of the first 
cephalic pair and the pair caudad of the cornicles. Cornicles (PL LXXIV, fig. 14) 
subcylindric, tapering distad, imbricated and slightly flanged. Legs slender, and 
armed with stiff hairs. Hind tibiae slightly curved, very little, if at all, swollen, and 
armed with circular sensoria; these vary greatly in number, from a few to about 
fifteen (PI. LXXIV, fig. 20). Three or four seem to be more common than the large 
numbers. They are very irregular in size, and are often very faint. Anal plate 
rounded, densely setose, and covered with a few long curved hairs on each side. 
Cauda somewhat elongate, conical setose, and armed with six or seven curved hairs 
on each side; length, 0.16 mm. Length of insect from vertex to tip of cauda, about 
1.8 mm. 
Color characters: Vertex and top of head dark brown to black. Thorax yellowish 
green, slightly pruinose. Anterior portion of the abdomen olive or greenish yellow, 
that portion just between and anterior to the cornicles dark green, forming quite a 
distinct band; segments of the abdomen caudad of the cornicles olive or yellowish 
green; margin of the abdomen with a row of dark markings. Cauda, anal plate, and 
cornicles black. Tarsi and distal extremities of tibiae, femora, and antennae dark 
brown. 
In older specimens which have oviposited, the green band upon the abdomen be¬ 
comes narrow and in very old specimens the body color often shows dark (dull) red- 
brown with the transverse band brighter than the remainder of the body. In a few 
cases the female is not olive or yellowish green as described, but is orange-yellow, of 
a color very similar to that of the males. 
MALE (PL. LXVII, FIG. 2) 
description 
First instar. —Morphological characters: Antennae as follows: I, 0.024 mm.; II, 
0.032 mm.; Ill, 0.096 mm., IV, base 0.056 mm., unguis 0.088 mm.; segments I and 
II with a few stout bristle-like hairs; segments III and IV imbricated, the third one 
toward its distal extremity only and both with a few stout hairs; segment III with a 
distal sensorium, and IV with the usual group at the base of the unguis. Compound 
eye with 12 to 14 facets, Cornicles short, thick, and rounded at their distal extremi¬ 
ties. Labrum about as long as segments III and IV of antenna. Legs thick and 
very hairy, hind tibiae 0.19 mm. long.. 
Color characters: Pale yellowish brown with dusky appendages and with the body 
often covered with a mealy bloom. 
