THE CHINCH BUG. S 
body; the prothoracic joint is relatively longer, and the metathoracic 
shorter. The head and prothorax are dusky coriaceous; two broad 
marks on the mesothorax, two smaller ones on the metathorax, two 
on the fourth and fifth abdominal sutures, and one at the tip of the 
abdomen, are generally visible, but sometimes obsolete; the third 
and fourth joints of the antenne are dusky, but the legs are still pale. 
After the second molt (fig. 3, f) the head and thorax are quite dusky ; 
the abdomen duller red, but the pale transverse band is still dis- 
tinct; the wing pads become apparent; the members are more dusky ; 
there is a dark-red shade on the fourth and fifth abdominal joints, 
and ventrally a distinct circular dusky spot covering the last three 
joints. 
In the last-stage larva or nymph (fig. 3, g), sometimes called the 
“pupa,” all the coriaceous’ parts are brown-black, the wing pads 
extend almost across the two pale abdominal joints, which are now 
more dingy, while the general color of the abdomen is dingy gray; the 
body above is slightly pubescent, the members are colored as in the 
mature bug, the three-jointed tarsus is foreshadowed, and the dark 
horny spots at the tip of the abdomen, both above and below, are 
larger. 
THE ADULT FORMS. 
There are two forms of the fully developed insect, but it is not 
known that the young of these two forms differ in any respect. One of 
these forms, the one originally described, is known as the long- 
winged form and is the only form that occurs over most of the country 
between the Rocky Mountains and the Allegheny Mountains. This 
form is illustrated in figure 1. 
The second form is much like the first, with the exception of the 
wings, which are more or less abbreviated, as shown in figure 2. This 
form occurs along the seacoasts, and in the East extends inland along 
the lower lakes to northern Illinois. It is not abundant, however, 
west of a line drawn from Toledo, Ohio, to Pittsburgh, Pa. Through- 
out the territory in which this short-winged form is found there are 
also intermingled with them individuals of the long-winged form. 
Both of these forms may be described as black, with numerous 
hairs, also black; the upper wings are whitish, with a black spot on 
each, and the under wings are white. They are about one-fifth of an 
inch or less in length and may be easily recognized by the accom- 
panying illustrations (figs, 1, 2, 3, h, 7, 7). 
SEASONAL HISTORY. 
Over the territory covered by the long-winged form, as previously 
given, the insect has two generations each year. The young of the 
first generation appear in May and June, and those of the second 
generation in August and perhaps as late as September. The adult 
