DESCRIPTIONS OF THE DIFFERENT STAGES. 



Tlie egg (%. 3, a, h). — Tlie average length of the egg is three 

 one-him(h-e(lths of an inch ; in shape it is elongate-oval, the diaineter 

 being scarcely one-fifth the length. The top is squarely docked and 

 surmounted with four small, rounded tubercles near the center. 



Fig. 2. — Chinch bug: Adults of short-winged form, much enlarged. (Author's iUustration.) 



When newly deposited the egg is pale or whitish and translucent, but 

 with ago it acquires an amber color, and finally shows the red parts 

 of the embryo within, and especially the eyes toward the tubercled 

 end. The size increases somewhat after deposition, and the length 

 will sometimes reach nearly four one-hundredths of an inch. 



Larval stages (fig. 3, c, d, 

 e, /). — The newly hatched 

 larva, or nymph, is pale j^el- 

 low, with simply an orange 

 stain on the middle of the 

 three larger abdominal 

 joints. The form scarcely 

 differs from that of the ma- 

 ture bug, being but slightly 

 more elongate; 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 ])rothoracic joint being but slightly longer than any 

 of the rest. The red color soon pervades the whole body, except 

 the first two abdominal joints, which remain yellowish, and the legs 

 and antennae, which remain pale. 



After the fii'st molt the red becomes bright vermilion, contrasting 

 strongly with the pale band across the middle of the body, the pro- 

 thoracic joint is relatively longer, and the metathoracic shorter. The 



l(-ir. n:!J 



Fig. 3.— Chinch hug: a, b, Eggs; c, newly hatched larva, 

 or nymph; d, its tarsus; e, larva after first molt; /, same 

 after second molt; ^, last-stage larva; the natural sizes in- 

 dicated at sides; h, enlarged leg of perfect bug; j, tarsus of 

 same, still more enlarged; i, prolwscis or beak, enlarged. 

 (From Riley.) 



