. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 177 margin near base having a pointed hump that bears a seta, this hump being more conspicuous from the dorsal aspect. Basad of this is a small, shelflike pro- jection (probably the cercus) bearing several conspicuous setae. Claspers ex- tending considerably beyond apex of tenth tergite. From the main body ot each clasper arise three, straight, finger- like processes: a short one arising just within apex and extending not quite to apex; a meso-dorsal one arising about one-third distance from base and running i
. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 177 margin near base having a pointed hump that bears a seta, this hump being more conspicuous from the dorsal aspect. Basad of this is a small, shelflike pro- jection (probably the cercus) bearing several conspicuous setae. Claspers ex- tending considerably beyond apex of tenth tergite. From the main body ot each clasper arise three, straight, finger- like processes: a short one arising just within apex and extending not quite to apex; a meso-dorsal one arising about one-third distance from base and running in the same longitudinal plane as the clasper and from a lateral view having the dorsal margin just visible above the dorsal margin of the clasper; and a third arising on the mesal margin near base and diverging dorsally at close to a right angle to the body ol the clasper. The body ot the clasper itself has a con- vex ventral margin; the dorsal margin is excavated near apex to form an apical point; from ventral view the clasper appears arcuate, the two claspers con- verging toward apex. Oedagus tubular and bearing two dorsal plates which lie above it; these plates are very thin, wide at base, tapering gradually to a sharp point, and follow the outline of the oedagus. Holotype, male.—Corvallis, Orenon: April 2, 1935, Oak Creek. The male genitalia of this species are practically exact for Nosopus podager McL. but the legs and mouthparts are quite normal. Considering the close re- lationship of these two, expressed bv similarity in male genitalia, it is obvious that the genus Nosopus is not really a distinct unit from many species which I am placing in Lepidostoma. Lepidostoma strophis new species This species is closest in most respects to modesta, differing in the short tenth tergite and other details of the genitalia, fig. 120. Male.—Length 8 mm. Color similar to quercina. General structure also similar to quercina with the following differences: maxillary palpi held close
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
