9 FARMERS’ BULLETIN 657. 
DESCRIPTIONS OF THE DIFFERENT STAGES. 
THE EGG. 
The average length of the chinch bug’s egg (fig. 3, a, 6) is three 
one-hundredths of aninch. In shape it is enitovsl ie diameter 
being scarcely one-fifth the length. The top is squarely docked and 
surmounted with four small, rounded tubercles near the center. When 
Fig. 2.—Chinch bug: Adults of short-winged form. Much enlarged. (Author’s illustration.) 
newly deposited the egg is pale or whitish and translucent, but with 
age it acquires an aniber color and finally shows the red parts of the 
embryo within, especially the eyes toward the tubercled end. The 
size increases somewhat after deposition, and the length will some- 
times reach nearly four one-hundredths of an inch. 
THE LaRVAL, OR NYMPHAL, STAGES. 
The newly hatched larva, or nymph (fig. 3, c, d), is pale yel- 
low, with simply an orange stain on the middle of the three larger 
abdominal — joimts. The 
form scarcely differs from 
that of the mature bug, be- 
ing but slightly more elon- 
gate; but the tarsi have 
only two joints, and the 
head is relatively broader 
and more rounded, while 
the joints of the body are 
subequal, the prothoracic Fic. 3.—The chinch bug: a, b, Eggs; c, newly hatched larva, 
Teen og eo eee y avec HEERLEDS ginnsogs lan a eee 
longer than any of the rest. dicated at sides; h, enlarged leg of perfect bug; j, tarsus of 
The red color soon per- Same still more enlarged; i, proboscis or beak, enlarged. 
(From Riley.) 
vades the whole body, ex- 
cept the first two abdominal joints, which remain yellow ish, and the 
legs and antenne, which remain pale. 
ie the first molt (fig. 3, e) the red becomes bright vermilion, 
contrasting strongly with the pale band across the middle of the 
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