clusters because the possibility of a supernumerary instar could not be ruled out. In
Table 3-2, the first and second clusters represent the first and second instar respectively.
Further sampling is necessary, but the third cluster may represent either a supernumerary
third instar or the adult stage. The fourth cluster represents the adults with three instars
or outlying data from measurements of extremely large adults.
160
u1 y = 44.603x + 16.233 Upper
r 140 2 Upper
SR2 = 0.7126 95% CI
2* 120 *
c 100
m Lower
S 80 95% CI
-,
E 60 o
S40 '- Linear
S, (Best Fit
o 20 Line)
I-
0
0 0.5 1 1.5 2 2.5
Gall Size (mm)
Figure 3-5. Linear regression analysis of the relationship between the diameter of the
apical base of the plant gall and the fused prothoracic trochanter/femur length
ofT. ovatus (r2 = 0.7126; df = 1, 65; p < 0.001).
Table 3-2. Mean and standard deviation of the length of the fused prothoracic
trochanter/femur segment for each developmental instar.
Cluster Mean Prothoracic Trochanter/ Standard Deviation
Femur Length (it)
1 (First Instar) 35.748 5.706
2 (Second Instar) 55.315 5.118
3 (Third Instar or Adult) 101.706 6.823
4 (Adult) 116.914 4.390