. Annual report. New York State Museum; Science; Science. 2l6 NEW YORK STATE MUSEUM' All Stages are found together on the piers. The eggs are laid in the soft spots in the old wood, where the surface-of the pier is kept wet, but not continually covered by water, in the zone of the " skin ; The larvae live exposed or thinly algae covered, and crawl about slowly over the wet surface. They are greenish in color and very inconspicuous. In a cavity among the stems of the dwarf mosses^ in a crevice at the upper limit of the wet area the larva spins about itself a sheet of tissue and
. Annual report. New York State Museum; Science; Science. 2l6 NEW YORK STATE MUSEUM' All Stages are found together on the piers. The eggs are laid in the soft spots in the old wood, where the surface-of the pier is kept wet, but not continually covered by water, in the zone of the " skin ; The larvae live exposed or thinly algae covered, and crawl about slowly over the wet surface. They are greenish in color and very inconspicuous. In a cavity among the stems of the dwarf mosses^ in a crevice at the upper limit of the wet area the larva spins about itself a sheet of tissue and fastens bits of moss stems and leaves to its outside, [fig. 9] and transforms inside the tube thus formed into a pupa. The tube is longer than its body, and the pupa moves in or out at will, doubtless by the aid of the hooks at the ends of its body. The larva measures in total length 10 to 15 mm, according to the state of extension of its body, and its diameter is, cor- respondingly to 2 mm. It is cylindric, abruptly tapering pos- teriorly on the last abdominal segment. The head is wholly retracted within the swollen pro- thorax: extracted therefrom, the head shows a broad middle pale yellow band, and its sides are black from the base of the an- tennae backward. The labrum is transversely oval, with a mar- gin of close set scurfy hairs. The clypeus is one fourth broader than the labrum, yellow with parallel sides, but emarginate on the front for the reception of the labrum, there are three recurved stout setae on the lateral margins of the clypeus each side, and one on each angle and two upon its disk. There are no legs, but there is a scurfy pubescent creeping fold on the under surface of the meso- and metathorax and a similar one on the first abdominal segment: and there are much larger^ transversely placed, muscular, scurfy-skinned creeping ridges 011 the under surface of abdominal segments 2-7 toward the front of * These mosses were kindly named for me by Professor Barn
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
