. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 157 posed of a tonguelike ventral flap which is thin and spatulate in outline, a middle submembranous and extrusible lobe and a dorsal pair of pointed, sclerotized rods which also are extrusible. Holotype, male.—Pinedale, Wyoming: July 6, 1936, Green River north of the town, H. H. Ross. Paratypes.—Wyoming.—Same data as tor holotype. Id'. I have compared this species with Athripsodes nigronervosus Retzius, of Europe, with which it is very similar in size and general appearance, but the genitalia of the two spec
. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 157 posed of a tonguelike ventral flap which is thin and spatulate in outline, a middle submembranous and extrusible lobe and a dorsal pair of pointed, sclerotized rods which also are extrusible. Holotype, male.—Pinedale, Wyoming: July 6, 1936, Green River north of the town, H. H. Ross. Paratypes.—Wyoming.—Same data as tor holotype. Id'. I have compared this species with Athripsodes nigronervosus Retzius, of Europe, with which it is very similar in size and general appearance, but the genitalia of the two species are very different. Athripsodes ophioderus new species Close to the punctattis group, this species differs from the members of that group in the necklike tenth tergite with its ovate apical enlargement. Male.—Length 10 mm. Color of head, body and appendages reddish brown, with the following exceptions: antennae almost straw color, each seg- ment with a very narrow, dark brown ring at apex; wings with three whitish spots, one just in front of and the other just beyond the stigmal area of the costal margin, the third on the anal margin near apex. Setation of body and ap- pendages a mixture of brown and black- ish hairs. General structure, including wing venation and setation, typical for genus. Eyes small, seen from lateral view ap- pearing slightly longer than high; seen from above, the two seem separated by three times the distance of their greatest dorsal length. Genitalia as in fig. 92. Ninth tergite produced dorsally into a narrow point. Tenth tergite somewhat S-shaped, di- vided into three distinct regions: (1) a robust basal part bearing at its apex a pair of short dorsal spurs and a pair of disto-ventral humps with a cluster of short, stout setae; (2) a slightly curved necklike portion which is slightly ex- cavated beneath, the dorsum convex transversely and twice as wide as deep; and (3) a bulbous apical portion which is rounded apically, no wider than the &q
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
