. Annual report. New York State Museum; Science; Science. semitransparent, whitish. Basal segment of clasp straw yellow, nearly cylindric, densely clothed with long, yellowish hairs, apical portion slender, nearly straight, dark brown. Harpes near base of claspers, chitinous, claw-shaped. Legs, pale straw yellow, rather sparsely clothed with pale straAv yellow hairs. Anterior tarsi and ter- minal segment of middle and posterior tarsi distinctly shaded with gray, ungues simple. Wings, pale straw yellow, veins sparsely clothed with similar colored scales; posterior fringe pearly white. Posterior
. Annual report. New York State Museum; Science; Science. semitransparent, whitish. Basal segment of clasp straw yellow, nearly cylindric, densely clothed with long, yellowish hairs, apical portion slender, nearly straight, dark brown. Harpes near base of claspers, chitinous, claw-shaped. Legs, pale straw yellow, rather sparsely clothed with pale straAv yellow hairs. Anterior tarsi and ter- minal segment of middle and posterior tarsi distinctly shaded with gray, ungues simple. Wings, pale straw yellow, veins sparsely clothed with similar colored scales; posterior fringe pearly white. Posterior cross vein less than half its length from mid cross vein. Petiole of first submarginal cell about one third the length of cell, that of posterior submarginal cell nearly one half the length of cell. Described from a recently emerged, well colored individual. The larva of this species is as trans- parent and difficult to detect in the water as the species met with at Poughkeepsie, and its transparency is balsam. Pupa. Air tube with irregularly hexagonal cells, about four times as long as wide, inner margin nearly straight, outer more or less uniformly arcuate; tip light brown, chitinous. Posterior three fourths of the inner edge of the inner paddle distinctly serrate, a few teeth near the tip at almost right angles to the margin. Pos- terior appendages simple, sub- conic, with inner margin slightly irregular, serrate near the apical fourth, and at their base an incon- spicuous pair of subtri angular lobes. Larva. Head, somewhat elongate, subconic. Basal segment of antennae long, deeply notched at base and tipped with four nearly equal, tapering processes and one about half as long. Just behind the antennae are 10 long, light brownish filaments, five on each side. These are the filaments of the third metamere of Meinert. Leaflike appendages slender, rounded anteriorly to a narrow base Fi^-. 105 Labrumof S. albipes likewise retained in. Fig. 106 Venti-al hooks of S. albipes. Plea
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
