Using a piece of thin glass tubing

Helen E. Murphy, « Observations on the Egg-Laying ogf the Caddice-Fly Brachycentrus nigrisoma Banks, and on the Habits of the Young Larvae », New York, Journal of New York Entomological Society, vol. 27, juin- septembre, 1919, p. 156-157.

The larvae leave the egg mass at once, hastily scramble over stones and sticks into the quieter eddies close to the bank. There they feverishly set about case building. Chewing off a piece of plant material here, gathering a bit of bark or root fiber there covering all with a generous supply of silk, they fashion splendid little cases. After the first row, which is more or less circular at first and is altered later, they are square in cross section. The larva holds the case with the mesothoracic legs, puts the silk-coated material in place with prothoracic legs, and tightly shoves it down with the metathoracic legs. Then the larva turns to the next side and puts on a piece of material there and so proceeds to each side in turn./…

In the laboratory, larval habits were best observed by using a piece of thin glass tubing one-half inch in diameter. This was heated and carefully flattened on the top to prevent aberration. Inside the tube fine sand and small stones were attached to the bottom by means of commercial glass cement. A cap of ordinary window screen fastened over the rear end of the tube prevented the larvae from escaping and did not hinder the attachment of rubber tubing for an outlet. At the other end was fitted another piece of tubing which connected with a small glass funnel. This funnel was fastened just under the faucet. The desired amount of water could be easily regulated at any time, and the funnel furnished a means of inroducing food.