. Bulletin. Natural history; Natural history. March 193S ROSS: NEARCTIC CADDIS FLIES 129. Fig. iZ.—Hyiiroplila mesal margin with a slightly produced, darkly sclerotized point in the middle; the transverse footlike portion of the base of the clasper is concealed within the last segment. Oedagus very long; portion below neck no longer than por- tion beyond neck, widening gradually to a moderately bulbous base; neck very narrow, not at all bulbous, with only a faint and thin spiral rod which encircles the basal portion of the neck; apical portion of oedagus saber-shaped and thin, the terminal ope
. Bulletin. Natural history; Natural history. March 193S ROSS: NEARCTIC CADDIS FLIES 129. Fig. iZ.—Hyiiroplila mesal margin with a slightly produced, darkly sclerotized point in the middle; the transverse footlike portion of the base of the clasper is concealed within the last segment. Oedagus very long; portion below neck no longer than por- tion beyond neck, widening gradually to a moderately bulbous base; neck very narrow, not at all bulbous, with only a faint and thin spiral rod which encircles the basal portion of the neck; apical portion of oedagus saber-shaped and thin, the terminal opening long because of the extreme obliqueness ot the apex. Holotype, male.—Turner Falls State Park, Oklahoma: June 2, 19,^7, along Honev Creek, H. H. Ross. Paratypes.—*.—Same data as for holotype, 36cr. Hydroptila arctia new species .'\lthough similar in a large number of respects to consimilis Morton, the at- tenuated claspers identify this new species at once. —Length mm. Color and general structure same as for other mem- bers ot the genus. Seventh sternite with only a short, pointed mesal process. Genitalia as in fig. 46. Genital capsule extending only a short distance into the abdomen, the basal lobe produced strong- ly ventrad. Lateral portion of ninth segment produced into a fairly long upturned process which is wide at the base and narrow at the apex, and has a dorsal cushion of stout setae at its base; below this the segment is slightly bilobed to form a pair of convex areas bearing numbers of setae. Tenth tergite markedly flares toward apex, the lateral areas having sclerotized plates which are wide on their basal half and taper on the flared portion to a point; their mesal portion consists of wide membra- nous lobes which are separated by a narrow cleft down the meson. Claspers broad at base, the apical portion rapidly tapering to an elongate, narrow struc- ture having a few scattereci setae on the mesal and lateral surfaces and a few minut
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
