* Department of Zoology, A.M.U., Aligarh-202 002, India. <drtariqento@kashrniruniversity.ac.in>
Section of Entomology, P. G. Department of Zoology, University of Kashmir, Srinagar-190 006.
The Dyaraaaaa's law was applied in lepidopterous larvae. This law can also be applied in case of acridoids where successive formation of instars is a progressive development. The measurements of head width of the successive instrars were made separately in both the sexes and within the same sex. The head width in successive instars increased in a geometrical progression. The average ratio of increase in each instar for males was 1.264 (minimum) at 27°C under isolated conditions and gone up to 1.309 (maximum) at 37°C under crowded conditions, while as in female hoppers, the average increase was 1.233 (minimum) at 37°C under crowded conditions and reaches up to 1.409 (maximum) at 27°C under the same crowded conditions, before they reached the adult stage. The calculated head width was found close to the observed head width.
Dyar's law, Choroedocus illustris
