THE PEA APHIS WITH RFJ^ATTOX TO FORACR CROPS. 
15 
specimens pale yellow-green at posterior end, becoming whitish green 
toward anterior end. Eyes maroon red. ^Viiteima? a little longer 
than body; 6-segmented; segment I pale gi'een; II pale green, with 
a faint })ro^^^lish tint; III, IV, and V pale, sometimes with a faint 
bro\vTiish tint, and the tips dusky to blackish; base of VI pale ])rowji- 
ish to dusky, becoming blackish at the tip: lilament of \'I l)hickish. 
Beak reacliing to coxib of second pair of legs. Legs witli femur pale 
greenish yellow to greenish, the apex sometimes pale bro^\^lish, tiljia 
pale with a slight duskmess and the tip l)la('kish, taii-^us black. 
Cornicles leaching just to or a little beyond tip of cauda. Cornichs 
pale gi'een to yellowish green at base, becoming pale dusk}" toward 
apex, the extreme tip black. Cauda conoolorous wdth body. Cor- 
nicles, cauda, and antemise usually semitransparent. 
Measm"em(^nts from one specimen, immediately after placing in 
balsam and before shi'inkage occurs: Length of body, moludiiig 
cauda, 1.70 mm, width, 0.64; length of cornicle, 0.40 mm. Measure- 
ments of antemial segmc>nts: 
I. 
n. 
in. 
V. 
VI base. 
VI 
filament. 
Mm. 
0. 12 
.12 
Mm. 
0.07 
.07 
Mm. 
0.278 
.268 
Mm. 
0. 278 
.295 
Mm. 
0.370 
.382 
Mm. 
0.174 
.157 
Mm. 
0. 73 
.73 
Fourth, instar, after tliird molt and between 127 and 128 hours old. — 
(Described from two specimens, Aug. 19-24, 1912.) Body pale gi'een, 
sometimes ^\Tth an indistinct yellomsh area at the base of each cor- 
nicle, the head and thoracic segments sparsely covered with a whitish 
pidveiTiIeiice which gives them a paler green color. Eyes maroon red. 
xintennse reachuig beyond tip of cauda; segment I conoolorous ^vith 
head, II conoolorous with head or with a faint brownish tint; III, IV, 
V, and base of VI pale bro\\niish green, with the tips blackish; fila- 
ment of VI blackish. Legs with femur pale gi-een at base, becoming 
faintly dusky toward apex, tibia pale brownish wiXh. tip blackish, 
tarsus black. Cornich^s r(\n.('hmg a httle beyond tip of cauda, pale 
green with the tip ])lackisli. Cauda conoolorous with body. 
Measurements from oiu^ specimen, immediately after placing in 
balsam and before shi-mkage occurs: Length of body, 2 mm., length 
mduduig cauda, 2.25, width, 0.92; length of coniides, 0.61 mm.; 
length of cauda, 0.25 mm. Measurements of aiiteniial segments: 
I. 
II. 
III. 
IV. 
VI 
filament. 
Mm. 
Mvi. 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
0.15 
0.07 
0. 4S7 
0.469 
0. 504 
0. 20S 
0.887 
. 15 
.07 
.504 
.452 
.504 
.208 
.887 
