2 CIRCULAR 51, U. S. DEPARTMENT OF AGRICULTURE 



tubercles. They are whitish at first, but gradually turn to amber 

 and later show red. The newly hatched bugs (fig. 1, A) have much 

 the form of the adults. At first they are yellow, but they soon turn 



Figure 1. — The chinch bug : A— D, first to fourth stages of the nymph, or larva ; E, 

 last nymphal stage, or pupa ; F, adult female of the long-winged form ; G, geni- 

 talia of the female ; H, genitalia of the male. Magnified about 15 diameters. 

 (Luginbill) 



bright red, with a pale band across the abdomen. A few days before 

 becoming adults they change to a brown-black color, but retain the 

 pale band, which is partly covered by the wing pads. 



