DESCRIPTION. 
13 
THE FULL-GROWN NYMPH OR PUPA. 
(Fig. 7.) 
Length, 0.99-1.09 mm. ; width at mesothoracic angles, 0.24-0.255 mm. Shape 
similar to that of adult. Color orange; posterior border of prothorax, 
mesothoracic angles, sides, and abdominal segments 2, 3, 6, and 7 more or less 
crimson. Head, length, 0.11 mm. ; width, 0.18 mm. ; orange, apparently faintly 
reticulated; eyes dark red, larger than in prepupal stage, facets small. Three 
ocelli present in close triangle between eyes, in color yellow. Antennae laid 
backward on head and reaching to beyond middle of prothorax; segments in- 
distinct, translucent white; 
segments 1 and 2 projecting 
in front of the head and 2 
with four setae or hairs, two 
extending forward, about 
0.0135 mm. in length. Tho- 
rax light orange or yellow. 
Prothorax about twice as 
wide as long. Wing-cases 
0.54 mm. long, extending to 
seventh abdominal segment, 
translucent white. Length 
from head to end of wing- 
pads, 0.825 mm. Legs trans- 
lucent white. Abdomen 
fusiform, similar to adult, 
surface plainly reticulated 
in older specimens, setae 
well developed, the longest 
ones at posterior end. 
Length of abdomen, 0.612 
mm. ; width, 0.31 mm. ; 
length of posterior seta?, 
0.085 mm. 
The younger stages of this 
insect differ distinctly from 
those of II. hwmorrlwidalis 1 
in the dashes of crimson so 
generally present on the 
sides. 
The pupa, of the male 
is shorter and more slen- 
der than that of the fe- 
male. This pupa differs 
from H. hcemorrhoidalis in its smaller size, in its yellow color, with 
the sides of the abdomen more or less stained with crimson, and in 
having the hairs of the body longer and the second segment of the 
antennae with two long setae. 
The foregoing descriptions are for the parts of California in Los 
Angeles County and more northern points, for Mr. Wildermuth 
Pig. 7. — The bean 
thrips : Pupa. 
(Original.) 
Greatly enlarged. 
1 For description of Helioihrips hcemorrhoidalis, see " The Greenhouse Thrips, 
Part VI, Bur. Ent., U. S. Dept. Agr., pp. 46-48, 1909. 
Bui. 64. 
