DESCRIPTION OF DIFFERENT STAGES OF DEVELOPMENT. 19 
EGG PERIOD AND NUMBER OF EGGS DEPOSITED BY RACE FEMALE. 
Dr. Shinier states that each female deposits 500 eggs, scattering 
them over a period of from ten days to three weeks, and as the adult 
develops in fifty-seven to sixty days after the eggs are deposited, or 
about forty-two days after hatching, it will be seen that some of the 
earliest hatched young are well along toward fall development by the 
time the last eggs are being deposited. According to Dr. Riley 
the eggs hatch, on the average, in two weeks. 
In a series of breeding-cage experiments Prof. W. G. Johnson found 
that each female deposited from 98 to 237 eggs, the egg period lasting 
from eighteen to twenty-one days, the period of oviposition covering 
from thirty-eight to forty-two days. Forbes also records in his Fifth 
Keport (p. ±±) experiments showing that the period of incubation may 
extend from twelve to twenty-two days. (See Forbes's l!»th Report, 
pp. 177-183.) It must be remembered, however, that Professor John- 
son had but six females employed in his experiments and that these 
were necessarilv under an artificial environment. 
DESCRIPTIONS OF THE DIFFERENT STAGES OF DEVELOPMENT. 
The following descriptions of the egg and various stages of the 
young bugs are taken from Piley's Seventh Missouri Report, while that 
of the adult is from the origi- 
nal by Thomas Say, as pub- 
lished in his American En- 
tomology Vol. I. p. 329, 
LeConte, Ed.). 
The efjg. — Average length. 0.08 
hull, elongate-oval, the diameter 
scarcely one-lit'th the length. The 
top squarely docked and sur- 
rounded with four small, rounded 
tubercles near the center. Color 
when newly laid, paleand whitish 
and translucent, acquiring with 
age an amber color, and finally 
showing the red parts of the em- 
bryo, and especially the 
toward the tubernaeled end. The size increases somewhat after deposition, and will 
sometimes reach near 0.04 inch in length. Fig. 2, n. b. 
Larval stage*. — The newly hatched larva is pale yellow, with simply an or 
(colored) stain on the middle of the three larger abdominal joints. The form scarcely 
dit't'ers from that of the mature bug. being but slightly more elongate; but the tarsi 
have bur two joints and the head is relatively broader and more rounded, while the 
joints of the body are Bnbequal, the prothoracic joint being but slightly longer than 
any of the rest. The red color soon pervades the whole body, except the tiist two 
abdominal joints, which remain yellowish, and the members, which remain pale. 
After the first molt the red is quite bright vermilion, contrasting strongly with the 
pale band across the middle of the bod} : tin- prothoracic joint i^ relatively longer 
and the metathoracic relatively shorter the head and prothorax are dusky and 
Fig. 2.— RH8SVS leueoptenu: a. b. eggs: <\ newly hatched 
larva; d. its tarsus : '>. larva after first molt ; /. same after 
<>nd molt: g, pupa — the natural sizes indicated at 
sides: /■. enlarged leg of perfect bug; ./'. tarsus of same 
>till more enlarged; ?'. proboscis or beak, enlarged (from 
Rile-. 
