The current experiment was conducted to find out the optimal conditions for mass rearing and developmental changes ofCyclosainsulana. The lab. conditions were maintained at (27±2)℃ and (65±5)% RH. The clear perplex cages and natural diet consisting of the aphids, larvae of the house fly and larvae of drosophila were used for rearing.C. insulana took (123.12±7.26) days to develop from eggs to adults passing through eight instars under prevailing vivoconditions. The eggs were greenish white in color with average size of 0.57 mm ±0.034. The eggs spent (7.52±1.64) days in emergence. Maximum number of spiderlings survived at the 5th instar (84%) and minimum at the 1st instar (34%). The measurements of different body parts including the total body length, cephalothorax and pedipalps of the both male and femaleC. insulanawere done with the help of micrometer and presented as mean± SD. The measurements varied in the each developing instar. It was concluded that spiders were difficult to rear in the lab. conditions and each developing stage which was regarded as instars showed variations in size colors and body characteristics.