February, ’24] 
READIO: SINEA DIADEMA 
85 
Length of Stages : In the insects reared, the first stage lasted from 
five to eight days, with seven days as an average for thirty-four indi¬ 
viduals. 
The second stage lasted from four to nine days, with seven days as an 
average for nineteen individuals. 
The third instar lasted from four to eight days, with six and one- 
half days as an average for thirteen individuals. 
The fourth instar lasted from six to sixteen days, with nine days as an 
average for nine individuals. 
The fifth instar lasted from eight to fifteen days, with twelve and one- 
half days as an average of seven individuals. 
Description of Instars 
The newly hatched nymphs have been described by Ashmead 8 
and by Barber , 10 but as these descriptions do not fit older individuals in 
the first stage in all particulars, they have been modified. Former 
descriptions of the other instars have not been found and are included 
here. 
First instar: Range in length 1.8 mm. to 2.5 mm.; length of first antennal seg¬ 
ment, .7 mm.; length of front femur .9 mm. General color dark; head, bases of 
antennae, top of thorax, front femora and tibiae, and middle region of abdomen 
black; remainder of antennae, front tarsi, and entire middle and hind legs brownish; 
lateral margins of dorsum of abdomen dirty white, especially anteriorly, eyes red. 
Location of spines as follows: Head, none; prothorax, one erect pair, and antero¬ 
lateral angles pointed; mesothorax, one erect pair; abdomen, none; front femur, 
two ventral rows, one dorsal row, and a single preapical spine on the inner side; 
front tibia, two rows on the under side. Openings to dorsal stink glands located in 
anterior portion of abdominal segments four, five and six, location marked by dark 
plates, unarmed in this instar. 
Second instar: Range in length 2.9 mm. to 3.6 mm., length of first antennal 
segment 1.1 mm., length of front femur 1.2 mm. General color dark, though slightly 
lighter than in the preceding instar, distribution of color as in the preceding instar. 
Location of spines as follows: Head, two large pairs and several smaller pairs; pro¬ 
thorax, one large pair and several smaller pairs on dorsum, sides spiny; mesothorax, 
one large pair; metathorax, none; abdomen, one pair on each of the dark plates 
on adbominal segments three, four and five, and an additional pair in a corresponding 
position on segment six; femur and tibia as in preceding instar. Openings to dorsal 
stink glands located in anterior portion of segments four, five and six; location marked 
by plates on the posterior portion of the segment preceding the opening, each plate 
being armed with a pair of erect spines. 
Third instar; Range in length 4.7 mm. to 5.1 mm.; length of first antennal seg¬ 
ment 1.5 mm., length of front femur 1.9 mm. General color much lighter than in the 
preceding instar, tawny, mottled, fairly uniform, with head, bases of antennae, top of 
thorax, front femora and three plates on dorsum of abdomen slightly darker than the 
