Larval instars

Head capsule width (mm)

Difference (mm)

Observed (Mean ± SE)

Range

Expected^a

I

0.60 ± 0.01118

0.55-0.70

0.60

0.00

II

0.78 ± 0.00729

0.75-0.90

0.78

0.00

III

1.02 ± 0.01441

0.95-1.20

1.01

0.01

IV

1.36 ± 0.01882

1.25-1.60

1.32

0.04

V

1.74 ± 0.01777

1.65-1.90

1.72

-0.02