. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 115. c? Genitalia Fig. 21. .-/gray/ea sa/leseti sinuate appendages (probably cerci) bearing a number of well separated setae at their apex; these extend con- siderably beyond the claspers. Above these and below the oedagus is a sclero- tized rod which (seen from lateral view) appears bent downward at almost a right angle; this has practically no setae on it and forms a sheath for the oedagus. Oedagus with the basal portion shorter than the apical portion; its margins irregular and sinuate and gradually taperin
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. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 115. c? Genitalia Fig. 21. .-/gray/ea sa/leseti sinuate appendages (probably cerci) bearing a number of well separated setae at their apex; these extend con- siderably beyond the claspers. Above these and below the oedagus is a sclero- tized rod which (seen from lateral view) appears bent downward at almost a right angle; this has practically no setae on it and forms a sheath for the oedagus. Oedagus with the basal portion shorter than the apical portion; its margins irregular and sinuate and gradually tapering to the neck; apical portion somewhat bulbous at base, then gradu- ally tapering to a constriction and be- yond this expanding again into a cuplike structure; within this is a sclerotized rod running through a circular opening which is above the neck; opposite this opening there originates a spiral ap- pendage which circles the oedagus com- pletely and then runs toward its apex. Holotype, male.—Saltese, Montana: July 7, 1936, H. H. Ross. Stactobia brustia new species This species differs from the geno- type in lacking well-defined cerci and in the crook-shaped apex of the oedagus. Male.—Similar in size, color and general characteristics, such as spur count, position ot ocelli, etc., to geno- type. Genitalia as in fig. 22. Tenth tergite consists of a large membranous hood, indistinctly divided transversely and bearing a few small setae scattered along this division and two large ones near the ventro-basal corner. Ventral plate heavy, bearing three whiskerlike brushes of setae, although their bases are not segregated into patches; the apex of the plate is turned up. Oedagus long and slender, its apex hooked. The internal support ot the genitalia is long, consisting of two long, ventro-lateral rods with a wide, sclerotized arch form- ing a dorsal bridge between them. The ends ot this support join the sides of the ventral plate. This plate is provided with sclerotized supports