. Bulletin. Natural history; Natural history. d" Abdominal sternites d" Abdominal tercites ' Abdominal segments. Fig. 6.—Peltoperla zipha. about twice as far apart as each is distant from adjacent compound eye. Pronotum much wider than long, an- terior corners angular and posterior cor- ners much rounded, raised rugosities on posterior two-thirds of area. Legs with third tarsal segments much longer than second and first tarsal segments combined, the first segment slightly longer than the second. Dorsum of abdomen without special structures through ninth tergite; tenth tergite with an
. Bulletin. Natural history; Natural history. d" Abdominal sternites d" Abdominal tercites ' Abdominal segments. Fig. 6.—Peltoperla zipha. about twice as far apart as each is distant from adjacent compound eye. Pronotum much wider than long, an- terior corners angular and posterior cor- ners much rounded, raised rugosities on posterior two-thirds of area. Legs with third tarsal segments much longer than second and first tarsal segments combined, the first segment slightly longer than the second. Dorsum of abdomen without special structures through ninth tergite; tenth tergite with anterior part forming a strongly sclerotized upraised ridge at- tached to a cleft, more membranous area from which the long, slender, pointed supra-anal process arises, fig. 6; two minute membranous lobes are adjacent to place where supra-anal process projects; ninth abdominal sternite with a broad, slightly elevated, weakly developed lobe in middle. Cerci straight, with about 14 segments. Wings extending far beyond tip of ab- domen and with venation as illustrated in fig. 6. The gill remnants are difficult to locate but there appear to be one on each side of the mesosternum and metasternum near point of articulation with leg and certainly one or more on each side near upper point of attachment of each mesothoracic and metathoracic leg. False gills are evident, one on each side, on the mesonotum and on the metanotum. Length to tip of wings 12 mm.; length to tip of abdomen 8 mm. Holotype, male.—Tributary of Little River, Elkmont, Tenn.: May 14, 1939, T. H. Prison k H. H. Ross. This new species is quite different from any described species and is easily separated from arcuata Needham (Smith 1917) be- cause it lacks the small lobe at base of the ninth abdominal sternite and has straight anal cerci. It differs markedly from the male of comelia Needham & Smith and related forms in the shape of its supra- anal process. TAENIOPTERYGIDAE The generic classification of the Taeni- o
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