80 NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—IQ22 
third segment; lateral submargins white, a prominent black spot sur- 
rounding each spiracle; ventral portion of. fifth and sixth segments 
black or only narrowly pale along median line, in the male partly coy- 
ered by dense silvery pubescence, seventh segment black on basal half ; 
genital segment black. 
The white areas described for this form may with age become 
red; the red color appearing first at basal angles of pronotum, tip of 
scutellum, apex of corium, and ventral areas of abdomen. Adults 
may at time of emergence have the pale areas partly red but in such 
specimens the corium is always black. The white color form here 
described always emerges from a fifth stage nymph which has the 
mesonotum pale, as is shown on Plate I. 
Yellow color form. <All the brown areas described for the white 
form are here deep black, while the white areas are reduced somewhat 
and replaced by yellow except on the tibiae. The corium is entirely 
black; embolium yellow but becoming black apically. The black on 
scutellum usually expanded, sometimes extending to base, and in dark 
forms spreading laterally so that only the apex remains yellow. In 
dark specimens the quadrate spots on pronotum may unite to form a 
transverse black bar. In the female the black on venter unites to 
form a lateral line, but situated somewhat beneath the black spots 
enclosing the spiracles. 
Red color form. The pattern of this form is similar to the pre- 
ceding except that the yellow color is replaced by red. Red forms 
occur in which the inner half of corium is red but in this case the bug 
was a white form to begin with and the red color has been attained 
during the adult stage. 
The three color forms here described will include a high percentage 
of those which one may expect to find. In a series of several hundred 
specimens, however, it is possible to pick out specimens which show a 
gradual transition from one form to another. (Plate III, fig. 3.) The 
line of demarkation between the yellow and the red forms is not always 
clear, for in many specimens the yellow gradually becomes orange, 
and in fact that change actually takes place in living adults. However, 
the colors never change once the adult has been killed and properly 
dried. Ina large amount of material collected ten years ago, the yellow 
and red colors have not faded in the least. 
During the breeding experiments, in which the writer was trying 
to establish pure lines of color, both yellow and red color forms were 
reared from parents which were of the typical white color pattern. 
Likewise, white color forms have been reared from both red and yellow 
parents. 
