. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 266 BULLETIN: MUSEUM OF COMPAKATIVE ZOOLOGY. Taxonus nortoni from the Green River beds of Wyoming. From his figures (PI. 10, Figs. 26-27) of the wing venation there seems to be no doubt that the generic reference is satisfactory. Palaeotaxonus, gen. nov. Body elongate, subparallel; the abdomen long, twice the length of the thorax, all its segments of equal width and of nearly equal length. Wing venation as in Taxonus, but the sub median cell is no longer than the median, the transverse median nervure being interstitia
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 266 BULLETIN: MUSEUM OF COMPAKATIVE ZOOLOGY. Taxonus nortoni from the Green River beds of Wyoming. From his figures (PI. 10, Figs. 26-27) of the wing venation there seems to be no doubt that the generic reference is satisfactory. Palaeotaxonus, gen. nov. Body elongate, subparallel; the abdomen long, twice the length of the thorax, all its segments of equal width and of nearly equal length. Wing venation as in Taxonus, but the sub median cell is no longer than the median, the transverse median nervure being interstitial with the basal vein. Anal cell divided by an obhque cross-vein which is nearly as long as the trausverse median nervure. Marginal cell long, pointed at the tip, divided by an unusually oblique, curved cross-vein. Second and third submarginal cells each receiving a recurrent ner- vure near the base. The present form resembles Taxonus in most respects, but differs very plainly in the interstitial transverse median nervure. This is evidently a primitive trait which is exemplified in several of the other fossil saw-flies here described. On this account I have thought the character to be of generic importance, especially taken in connection with its constancy among large groups of recent Hymenoptera. Palaeotaxonus typicus, sp. nov. Length mm. Head and thorax black, the abdomen more or less rufous or brownish. Head square behind, rounded toward the front, twice as wide as thick. Antennae of equal thickness for at least the basal two-thirds; black ; the joints not very well differentiated in the specimen, but one somewhat beyond the middle is about four times as long as thick. Wings hyaline, humeral area with a cross- vein just basad to the origin of the basal vein, which is close to the origin of the. Fig. 7. —Palaeotaxonus typicus Brues. Fore-wing. cubitus. Basal vein and first recurrent nervure almost parallel, slightly conver- gent behind. First section of the cubitus twic
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