. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN THE ADIRONDACKS 567 metathorax and the first seven segments of the abdomen. Two stalks occur together on each side of the segment, and these are in turn divided into six or nine filaments. Instead of four stalks the mesothorax has two, the metathorax three and the seventh abdominal segment one. Two brown spots are very prominent on the ventral side of the eighth and of the ninth segments. The anal hooks are on very large prolegs of one joint each. A bunch of hairs is at the base of each hook. One or two stout hairs arise near the
. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN THE ADIRONDACKS 567 metathorax and the first seven segments of the abdomen. Two stalks occur together on each side of the segment, and these are in turn divided into six or nine filaments. Instead of four stalks the mesothorax has two, the metathorax three and the seventh abdominal segment one. Two brown spots are very prominent on the ventral side of the eighth and of the ninth segments. The anal hooks are on very large prolegs of one joint each. A bunch of hairs is at the base of each hook. One or two stout hairs arise near the base of the hook and extend to meet its point. Pupa. Length 11 mm. Width 2 mm. Head pinkish. Thorax white. Spurs on the tibiae arranged in the order 1-4-4. Abdomen white with brick red on the dorsal side. Hooks pointing backward are on the third, fourth, fifth, sixth, seventh and eighth segments. Plates with spurs pointing forward are on the third and fourth segments. I was able to make out but eight abdominal segments in this pupa. I Halesus species ? Plate 32, figures 3, 6; plate 33, figure 3 Habitat. Larvae and pupae were found in Little Clear creek and along the shore of Little Clear lake, specially on wood strewn bottoms. Occurrence. Larvae were quite plentiful during the entire period. Pupae were obtained only at the last. Only two or three adults were seen and those during the last week of work. A single specimen of this species was bred Aug. 31, 1900. Case. (PI. ss, fig. 3) Case of thin pieces of wood placed at right angles to the length of the case with their ends crossed. The coarseness of the material used varies but is uniform for each case. Length 18 to 20 mm. Width 7 mm. Larva. (PI. 32, fig. 3) Length 15 mm. Width 4 Dr c; mm. Head brownish black with broad white stripes running obliquely from the corners of the mouth along both dorsal and ventral sides of the eyes. There is a white spot where the inner pair of stripes . Fig. 37 Dorsal view of end of abdo- would un
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
