. Annual report of the Regents. New York State Museum; Science. AQUATIC INSECTS IN THE ADIRONDACKS 477 formed. I believe that the season for their transformation was past and that the period of adult life for this insect is a long one. The few speci- mens captured were all males. Nymph. Measures in total length 41 mm; abdomen 30 mm; hind femur 6 mm; width of head 7 mm, of abdomen 8 mm. Body very densely rough hairy; colors (entirely obscured except after molting) yellowish marked with brown spots; a pair of these at the base of the fore wings, a double submedian row along the dorsum of the abd
. Annual report of the Regents. New York State Museum; Science. AQUATIC INSECTS IN THE ADIRONDACKS 477 formed. I believe that the season for their transformation was past and that the period of adult life for this insect is a long one. The few speci- mens captured were all males. Nymph. Measures in total length 41 mm; abdomen 30 mm; hind femur 6 mm; width of head 7 mm, of abdomen 8 mm. Body very densely rough hairy; colors (entirely obscured except after molting) yellowish marked with brown spots; a pair of these at the base of the fore wings, a double submedian row along the dorsum of the abdo- men, oval, with apices con- vergent in each pair: external to these, another row each side with apices divergent; external to these, a less conspicuous row each side, of spots lying nearer the bases of the segments; supe- rior and inferior appendages yellow, black tipped, fringed densely on their internal mar- gins with soft black hairs; laterals one fifth as long, not fringed. Mentum of labium bell-shaped in outline (fig. 16); median lobe very long and dilated on the cleft apex in a pair of flat ovoid lobes, with ser- rulated margins and each with an external apical denticle; lateral lobe with 10 or II very unequal sharp teeth on distal margin, the longest of the teeth, the movable hook and the setae of about equal length, the hook several times as thick as the setae; setae five; setae on mentum 10 or 11, six or seven longer ones in a longitudinal row at the sides, and four small ones extending from the proximal end of this row toward the median line. Abdomen with segments about equal in length as far as the loth, which is about one third shorter; appendages equal the ninth segment in length; in the female the long triangular lobes of the ovipositor extend to the apex of the ninth segment, against which they are closely applied; lateral spines, minute cylindric pointed rudiments, hidden among the hairs of the lateral margins, on the eighth and ninth Fig. 16 Labiu
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
