Publisher's Synopsis
Excerpt from Annals of the Entomological Society of America, Vol. 7: December, 1914
To quote from the first article: The typical form of the structure resembles a tunnel attached to the surface of a stone, having at its mouth a vertical framework with a net stretched across it. An open mouth or entrance to the case is always close to this net on the side towards the current, so that without wholly leaving its house the larva can remove from the net anything eatable, which the current may have lodged there. The mode of building varies considerably. The case is usually about half an inch long and a little curved, loosely attached to the stone by its edges and without any bottom. It may be composed entirely of sand or of bits of plants or both combined. The supporting framework of the net is always formed of vegetable bits, and is sometimes a simple arch, sometimes a complete ring, and sometimes a short cylinder. It is occasion ally stayed or held in position by silken cords stretching from it to suitable points on the stone. It is stiff enough to stand erect even When removed from the water. When it is in the shape of a cylinder or broad arch the net is always stretched across that end of it which is down stream and the entrance usually opens under the shelter of the arch. In a stream in Brookline, Mass, are large communities of these larvae. The stones in the stream are covered With mud, leaves and rubbish.
Sometimes a stick which has fallen into the brook has a row of cases and nets built upon it. Often a stone will have a row of them side by side along one edge, or there may be only a few of these structures scattered separately upon its surface She mentions having received a net and larva from Mt. Desert, Me.
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