The promothea moth, whose cocoons are common on lilac bushes, may be studied in the same way as the emperor.
Reference.—Silcox and Stevenson: Modern Nature Study
DRAGON-FLY
The larvæ of this insect may be obtained in May or June by scraping leaves, weeds, and mud from the bottom of ponds and allowing the mud and water to settle in a pail or tub. The larvæ may be distinguished from other aquatic creatures by the long insect-like body, three pairs of legs, and the "mask"—a flap with pincers at the end. This mask can be turned under the head and body when not in use, or it can be projected in front of the larva for catching prey. At the rear end are three tubes, which fit together to form the breathing tube.
The pupils should observe the above features, and also the movements, seizing of prey, breathing, moulting, semi-resting or pupa stage, at the close of which the pupa climbs up a reed or stalk of grass and bursts the skin from which the adult emerges.
The pupils should put into the aquarium various kinds of insects and decide what foods are preferred by the larva and the adult.
Observe.—The size, length of body, movements in flight, lace-like wings, and insect-killing habits of the dragon-fly.
Should dragon-flies be protected? Give reasons. Are all dragon-flies of the same size, build, and colour? At what time of year are dragon-flies most numerous?
Reference.—Silcox and Stevenson: Modern Nature Study.