The biology and morphomatric study of leaf eating caterpillar, D. indica in cucurbit was conducted at ICAR-Central Institute for Arid Horticulture, Bikaner during 2015-16. The average eggs laid per female were 162.70 ± 31.84. Eggs are laid on leaves or young shoots or fruits. The average incubation period was 3.53 ± .040 days under laboratory conditions. The duration of first instar larva was 1.90 ± 0.63 days. The duration of second instar larva was 2.60 ± 0.36 days. The duration of third instar larva was 1.50 ± .37 days. The duration of fourth instar larva was 1.48 ± 0.30 days. The fifth instar larva period lasted 1.43 ± 0.34 days.The pre-pupal and pupal periods were 2.38 ± 0.62 and 9.20 ± 1.42 days, respectively. Adult longevity was observed 9.98± 1.45 under laboratory conditions. They are 0.85±0.017 in length and 0.39± 0.008 mm width. The length of I st instar larvae is 4.30± 0.135mm and width is 0.53±0.019 mm. The length of II nd , III rd and IV th larvae are 5.47±0.153 mm, 9.51±0.187 mm and 14.81±0.121 mm, respectively. The fifth instar larva is 18.10±0.125 mm length and 3.28±0.043 mm width. Pupa is 13.66±0.088 mm length and 2.28±0.043 mm width. Adult female body length was 11.19±0.211 mm and width 24.54±0.201 with wing expansion. The male body length is 11.00±0.159 mm and width 22.85±0.156 mm with wing expansion. The length of male and female antenna is 9.01±0.024 mm and 9.24±0.058 mm.