SOME EOCENE INSECTS FROM COLORADO AND WYOMING By T. D. A. Cockerell, Of the University of Colorado, Boulder. The insects described below were obtained by or for the United States Geological Survey and are now the property of the United States National Museum. Those from White River, Colorado, and Green River, Wyoming, come from the collection accumulated by S. H. Scudder many years ago. It is generally understood that all these fossils are of Green River age; but they come from different horizons, evidently by no means contemporaneous. It is a matter for the future to minutely study the series of rocks ascribed to the Green River period and determine what subdivisions are necessary. These strata are of peculiar interest at the present time, as they include oil shales, which are expected to prove of great economic importance. ORTHOPTERA. Family GRYLLIDAE. PRONEMOBIUS ORNATIPES, new species. Plate 8, fig. 8. Length, 11.5 mm.; width of abdomen, 5.5 mm.; anterior femur, about 2.7 mm.; hind femur, 7 mm.; hind tibia, about, 5.4 mm.; width of hind femur, 2 mm. Anterior femora dark above, but below or posteriorly with a large colorless patch, notched in front and behind, and near the apex with a small spot. Middle femora with the same marks, except that the large spot is almost or quite divided into two elongate ones. Hind femora with oblique stripes as in modern Nemobius, but I can not see any hairs. Each side of abdomen with a series of transverse spots, each connected in the middle with the next, forming a longitudinal moniliform band. Ovipositor appar-ently quite short, exserted about 2.5 mm. Eocene. "Cathedral Bluffs south of Little Tommies Draw, at point where samples were taken." (Winchester 17-5; U. S. G. S.) Colorado. Certainly very close to P. tertiarius Scudder, but larger throughout, and probably distinct. Scudder's insect came from the Green River of Wyoming. Scudder does not describe any marking of the anterior and middle femora of his species, but his figure indi-Proceedings U. S. National Museum, Vol. 59— No. 2358. 29
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