THE PEA APHIS WITH RELATION TO FORAGE CROPS. 17 
typical of the genus; more than half as long as the coniieh^s, Ixniriug 
a number of moderately long hairs. 
Measurements (averages) from three specimens, taken inmaediately 
after placing in balsam and before shrinkage occurs: Length of body, 
2.67 mm., length to tip of cauda, 3.22; width, 1.24; cornicles, 0.98 
mm.; cauda, 0.59 mm. Measurements of antennal segments: 
I. 
II. 
III. 
IV. 
V. 
VT, 1kis.>. 
\\, fila- 
lllCIll . 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
0.191 
0. 0S7 
0.904 
0. 713 
0. 713 
0. 261 
1. 130 
.191 
.087 
.930 
.730 
.713 
.261 
1.026 
.191 
.087 
.817 
.678 
.696 
.261 
1.026 
.191 
.087 
.800 
.678 
.626 
.2^0 
.974 
.191 
.087 
.887 
.696 
.678 
.261 
.991 
.174 
.087 
.870 
.696 
.696 
.261 
1.026 
Pujpa {fourth instar) (fig. 5). — (Described from three specimens, 
Aug. 22, 1912). Entire dorsum pale green, sometimes with a delicate 
white pulverulence. Wing pads pale greenish with faint bro^^^lish 
border, the tips darker bromi. Underside of body with a distinct 
white pulverulence. Eyes maroon red. iVntemise Avith segments I 
and II concolorous with head; III, IV, and V pale mth sHght bro'^nish 
tint and tips blackish; VI entirely blackish. Beak not reaching 
coxae of second pair of legs. Legs with femur pale green, tibia pale 
with shght broAvnish tint and blackish at the tip, tarsus black. 
Cornicles pale green at base, becoming whitish with a faint duski- 
ness, the tips black; cauda concolorous with body. 
Measurements (average) from tlu-ee spechnens, immediately after 
placing in balsam and before shrinkage occurs: Length of body, 2.94 
mm., width, 1.19; length of cornicles, 0.63 mm. Measurements of 
antennal segments : 
I. 
II. 
III. 
IV. 
V. 
VI, base. 
VI, fila- 
ment. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
0. 139 
0. 078 
0. .5.56 
0. 495 
0. .539 
0. 2t)9 
0.834 
.139 
.078 
.5.39 
.487 
..548 
.209 
.852 
. 139 
.069 
.487 
.469 
. 513 
. 209 
. SOS 
.139 
.078 
.461 
.443 
.487 
.209 
.817 
.156 
.078 
.539 
.522 
.539 
.209 
.800 
.148 
.078 
.5.56 
.513 
.565 
.200 
.887 
Winged viviparotis female (fig. 6). — (Described from three speciiiuMis 
reared on red clover, Aug. 22 and Dec. 11, 1912.) Head pale y(4low- 
green, thoracic shield shining yellow-green, otln^r parts of thorax 
concolorous with the head, and abdomen pale green with the eyes 
of the embryos showing through the skui of tlie dorsum as in 1 lie case 
of the adult whigless female. Eyes bright red. Aiiteniue (fig. 6, a) 
placed on large frontal tubercles, and reachmg beyond tip of cauda; 
98034°— Bull. 276—15 3 
