THE PEA APITIS WITH RELATION JO EOKACE CKOl'^^. 19 
Measurements (average) from three specimens, immediately after 
placing in balsam and before shrinkage occurs: Length of body, 
2.79 nnn., to tip of cauda, 3.18., width, 1.11; length of wings, 3.51 
mm., width, 1.16; h^igth of cornicles, 0.84 mm.; length of cauda, 
0.46 mm.; h^ngtli of liind tibia, 2.32 mm. Measurements of antennal 
segments: 
I. 
II. 
III. 
IV. 
V. 
VI, base. 
VI, fila- 
ment. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
0. 156 
0.069 
0. 826 
0. 721 
0. 748 
0.304 
1.095 
.156 
.078 
.817 
.730 
.748 
.296 
1.001 
1.006 
.716 
.735 
.329 
1.006 
1.006 
.968 
1.045 
.677 
.6.58 
.658 
.735 
.658 
.677 
.310 
.310 
.290 
.987 
.968 
SEXUAL FORMS. 
Winged' male (fig. 7). — (Described from two specimens, Dec. 4, 
1912.) Head and pro thoracic segment gamboge "wdth a dusky to 
Fig. 7.—Mncrosiphum pisi: Winged male, much enlarged; a, antenna of same, more enlarged. (Original.) 
brownish longitudinal median dorsal marking which does not extend 
quite to tip of head. Thoracic shield bro^\mish with interstices con- 
colorous with head. Abdomen pale green with pah^ dusky markings 
as sho^\^l in the illustration (fig. 7) and the segments posterior t(^ tlie 
cornicles pale yellowish green. Eyes very dark red, almost black. 
AntenuiT? (fig. 7, a) noticeably longer than body; filament of VI longer 
than III; entire antenna blackish excepting segments I and II and 
