468 Journal of Agricultural Research voi. vn, no. » 
Table II .—Length (in millimeters) of the antennae of summer forms of Macrosiphum 
granarium 
WINGED VIVIPAROUS FEMALES (PL. 34 , B) 
No. 
Specimen No. 
1 
2 
3 
4 
5 
6 
7 
I . 
II . 
III . 
IV. .. 
V. . 
VI.. 
Total... 
Cornicles. 
Cauda. 
O. 09653 
.06895 
. 66192 
• 55849 
.38612 
/ .12411 
l •77224 
0. 09653 
. 06895 
. 60676 
• 55849 
. 38612 
. 13100 
0.09633 
.06895 
. 66192 
.57128 
. 44128 
. 12411 
. 66192 
0.09653 
• 07584 
• 64813 
• 56539 
. 44128 
■ 13790 
• 64813 
0. 09653 
. 06895 
■ 59986 
■ 47575 
.38612 
. 12411 
• 75845 
0.09653 
. 08274 
• 63434 
. 46886 
* 35 8 S 4 
.11721 
. 64813 
2. 66836 
2, 62594 
2. 61320 
2. 50977 
2. 40635 
f .42749 
l * 41370 
• 3 ° 33 8 
- 4343 8 
. 44128 
• 30338 
• 37233 
.38612 
.27580 
WINGLESS VIVIPAROUS FEMALES (PL. 34, D) 
I... 
0.10342 
, 06895 
• 57918 
• 35854 
. 31027 
r. 11712 
I • 56539 
0.11032 
. 07584 
. 75228 
• 35854 
• 28959 
. 12411 
• 53091 
0.11032 
• 07584 
• 56539 
• 42438 
• 33785 
• 13790 
. 68260 
0.11032 
. 08274 
. 71708 
. 52402 
• 37233 
. 12411 
• 70329 
0.1103 2 
. 08274 
. 68950 
. 52402 
. 38612 
. 12411 
. 68950 
II. 
III . 
IV . 
V . 
VI . 
Total... 
0.62055 
. 42749 
• 3 * 7*7 
. 12411 
. 60676 
0.62055 
. 44128 
.33096 
. 12411 
. 62055 
2. 00296 
2. 06159 
2.33428 
2.63389 
2. 60631 
/ .42749 
l -42749 
.33096 
. 46196 
.44817 
• 33096 
* 59 2 97 
• 59297 
- 41370 
. 46886 
. 48265 
•34475 
v^omicies. 
Cauda. 
1 
SEXES 
The following description of the sexes is from Sanderson (13): 
Apterous oviparous female. [PI. B, 5.] One specimen, 1.9 mm. long by 1 mm. 
wide; antennae [PI. 34, E] 2 mm., segments, 3, 0.50 mm.; 4, 0.35 mm.; 5, 0.30 mm.; 
6, 0.10 mm.; 7, 0.50 mm.; cornicle, 0.43 mm.; cauda, 0.21 mm. Somewhat smaller 
than viviparous form. At first yellow, then turning green and darker green. Head 
light brown. ■ Distal two-thirds of femora, tip of tibia, tarsi and cornicles black, 
antennae black. Conspicuous horizontal black marking in pit of connexivum on 
either side, these being more or less connected by black lines on the sutures of the 
first six abdominal segments and coalescing to form a faint but distinct black spot 
on abdominal segments 4-6. Meta-tibia with numerous pores. [PI. 34, C.] 
Winged male. [PI. 33, B.] Antennae [PI. 34, A] 2.8 mm.; segments, 3, 0.68 min.; 
4, 0.50 mm.; 5, 0.46 mm.; 6, 0.14 mm.; 7, 0.78 mm.; cornicle, 0.14 mm.; cauda, 
0,14 mm.; wing 3.35 mm. long. The third antennal segment with 35 to 50 sensoria, 
the fourth segment with a row of 10 to 12 on basal two-thirds, about 10 large sensoria 
