Abstract
Seven fossil impressions of caddisfly cases were discovered during investigations of the fossil insects from the paper shale deposits of the Ruby River Basin of Montana. Three specimens, comprising 1 new species, are all members of the pseudogenus Folindusia Berry. These impressions represent the 1st species of this taxon to be described from this locality. The other 4 specimens are presently being studied to determine their proper taxonomic position. The fossils were found in layered shale of Oligocene age between Peterson and Morman Creeks, sec. 23, T. 7 S., R. 5 W., Madison County, Mont. The diggings are located ca. 13 miles from the town of Alder, Mont. A brief description of the geologic history of this region can be found in a previous paper (Lewis 1971).
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