232 THE UNIVERSITY SCIENCE BULLETIN. 
First Instar. 
Size. Length, 1.29 mm.; width of body, 0.754 mm.; width of head, 
0.598 mm.; distance between eyes, 0.416 mm. 
Shape. Width greater than one-half the length. Body very flat in 
the newly hatched. 
Color. Newly hatched almost transparent, but in the course of a few 
hours assuming the color pattern delineated in fig. 8 of pl. XXVI. Gen- 
eral color is pale yellow, the darker pigment being smoky. The pro- 
thorax, mesothorax and metathorax each bear a pair of irregular smoky 
blotches. The pair on the metathorax being large and extending to 
lateral margins of the segment. Part of the color of the abdomen is due 
to the food in the digestive tract within. In the nymphs about ready to 
transform the entire body is darker. 
Second Instar. 
Size. Length of body, 1.77 mm.; width of body, 0,936 mm.; width of 
head, 0.78 mm.; distance between eyes, 0.442 mm. 
Color. Darker than in other instar. The body transversely banded 
with darker pigment. The transverse lines on thorax and abdomen are 
reddish-brown. The other dark areas smoky. A smoky band parallel 
with margin distinguishes this species from the same stage of Palma- 
corixa buenoi. The head is marked by three longitudinal smoky bands. 
Third Instar. 
Size. Length, 2.31 mm.; width of body, 1.19 mm.; width of head, 0.99 
mm.; distance between eyes, 0.52 mm. 
Color. Third instar nymphs often darker than second and have a 
definite color pattern. The hair upon the wing-pads now appears, and 
enmesh the air. Head: eyes dark red, head pale, marked by a median 
longitudinal dark band; faint lines lie between this and the eye, one on 
either side. Rear margin of head fringed with black hairs especially 
near the dorsal median line. Margin of wing-pads dark and fringed with 
a pile of fine dark hair. Prothorax hidden. Mesothorax is traversed 
by a reddish-brown band near posterior margin. The hairy fringe of 
fore wing-pads continues across the dorsum. Metathorax pale with a 
smoky pattern of five spots, the median one crossed by the pale median 
streak that reaches the length of the thorax. These spots consist of | 
erescentic patches in front, their inner horns almost touching the median 
triangular patch of color, on either side of which lie the right angled 
patches. Posterior margin reddish-brown. Abdomen: margin smoky 
gray, the suture between the tergites marked by dark reddish-brown 
bands; two rows of irregular quadrangular patches of smoky color lie on 
either side of median line, from third to sixth, inclusive. Three pairs of 
odoriferous pores, front ones on caudal margin of third segment small, 
the secdénd and third pairs larger, and the very dark glands are apparent 
beneath the integument. Dark ring around anus. Legs for the most part 
pale; hair fringe dark. 
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