U.

anti the hairs which cover their wings, instead of the scales that adorn those of the 1nncw, to which they bear the greatest affinity. The larva' of these' insects live in the water, in tubes formed of silken fibres, covered on the outside with small pieces of wood, sand, gravel, leaves of plants, &c.; and sometimes even the smaller lestaceous animals are dragged alive about with them. These larvae have an instinctive skill of making' their habitations nearly in equilibrium with the' water: when too heavy, they add a bit of wood or straw; when too light, a bit'of gravel. These tithes are open at each end, and the larvae which in habit them, when feeding, stretch out the head and fore parts' of the body, and creep

along the bottom of the water. In most spe

cies there is an upright Pal)111a, or process,
which serves as a prop, to prevent the tube
from slipping too forward, whilst the insect is
thus' employed. When this creature is ap
proaching its change to a chrysalis, he stops
up the openings of its' tube with threads of a
loose texture, through which the wattr easily
penetrates, though they resist the approach of
voracious insects. The members of the wing
ed. insect are visible' through its thin covering,
and as SOOfl as they are OIl tlic joiiit of being
developed, the tube, with its chrysalis, rises
to