Here is life cycle of colorado potato beetle (Leptinotarsa-decemlineata) picture with brave explanation.

Egg Stage. The insect overwinters in the adult stage a few inches beneath the soil surface. In the spring the one-half inch beetle emerges from the soil and searches for a suitable host. Once a suitable host has been located, the beetles feed, mate and lay their eggs on these plants. The yellowish-orange eggs (Figure No 1) are deposited on the undersides of leaves of host plants and nearby weeds. Each egg is about 1.8 mm long. Over a 4 – 5 week period, each female beetle lays eggs in batches of 20 – 35. A total of 400 – 600 eggs may be deposited by one female.

Larva Stage. Red at first, this soft grub has a black head and black legs. As it matures, the larva turns yellowish-red or orange and develops two rows of black spots along each side of the body. It reaches a length of about 10 mm. It feed for 2 – 3 weeks before crawling down the plant and onto the soil; they then construct a small chamber in the soil and pupate. (Figure No 2)

Pupa Stage. Generally resembling the adult in shape, the pupa is approximately 13 mm long. The insect spends 5 – 10 days in the pupal stage. (Figure No 3)

Adult Stage. This oval, convex beetle is yellowish-brown and about 9 to 14 mm long. It has five longitudinal black stripes on each wing cover and a variable number of black spots on the pronotum (area just behind the head). (Figure No 4)

The Colorado potato beetle (Leptinotarsa-decemlineata), a yellow insect with ten black stripes down its back. This insect is among to coleoptera order. This insect was first discovered in the Rocky Mountains feeding on a common weed called buffalo bur (Solanum rostratum). However, as pioneers settled the area and started planting new crops, especially potatoes, the insect migrated to this new and much more available food source.

1. Eggs Stage. The eggs of red Lily Beetle are lain in rows of about 2-15 eggs on underside of leaves. The size of these eggs are about 1.0 x 0.5 mm and orange in coloration with a sticky orange-red secretion, which help the eggs stick to leaves. This stage usually occur in late spring-summer.
2. Larval Stage.  Red Lily Beetle larvae consist of four larval instars, developmental stages between each moult within larval stage.  Larva are deep orange. The stage last about 10-11 days.  This stage usually occur summer.
3. Pupal Stage. After changing colour from yellow to orange, the pre-pupal larvae bury themselves in the soil and construct well camouflaged cocoon from which the beetle emerges as young adult after 20-22 days of pupation. This stage usually occur in summer-autumn.
4. Adult Stage. The adult over winter in the litter, reemerging in the spring from their hibernation sites and feeds on lilies and fritillaria. This stage usually occur in winter-spring. 

Lytta vesicatoria have an emerald-green color with 15 mm to 22 mm long and 5 mm to 8 mm wide.  An adult Lytta vesicatoria feed on leaves of ash, lilac, amur privet, white willow trees, and the larvae are parasitic on the brood of ground nesting bees.