. Contributions to Canadian palæontology. Paleontology. nandlirach] ^ - ^ CANADIAN FOSSIL INSECTS 121 Penihetria platypiera, sp. nov. Fig. 29. Locality: Horsefly mine—(July 20, 1906. ). A large very heavily b^uilt insect, with broad wings of Bubellip- tical form, slightly curved lanterior margin, and strongly arched posterior border, and with broadly rounded off apex. The radius extends seven-tenths the length of the wing and is only very gently curved. Its sector issues at the termination of the first third of the length of the wing, is very gently arcuate, and bifureateis in haU its ow
. Contributions to Canadian palæontology. Paleontology. nandlirach] ^ - ^ CANADIAN FOSSIL INSECTS 121 Penihetria platypiera, sp. nov. Fig. 29. Locality: Horsefly mine—(July 20, 1906. ). A large very heavily b^uilt insect, with broad wings of Bubellip- tical form, slightly curved lanterior margin, and strongly arched posterior border, and with broadly rounded off apex. The radius extends seven-tenths the length of the wing and is only very gently curved. Its sector issues at the termination of the first third of the length of the wing, is very gently arcuate, and bifureateis in haU its own length. The anterior branch is iiot widely divergent, (although it is strongly curved and relatively long, and fuses in the margin equidistant from the radius and the posterior branch. The radio- medial cross-vein is sitHiated some distance below the ceiitre of the wing and three times fes far from the base as from the fork of the sector. The media forms a relatively short but widely divergent bifurcation. The cubitus is very strongly curved, but fuses in the posterior margin just below the middle. The anal vein dichotomizes in half its own length. The mediocubital cross-vein is somewhat more than twice as far removed from the radiomedial cross-vein as is the latter from the furcation of the media. The entire wing is strongly pigmented, and is especially opaque tjjward the anterior margin. I —<. Fig. 29.—Penthetria platyptera, Ilandlirsch. In addition to the foregoing speci«s, which comprise 24 examples in all, there are 12 other specimens in the collection that undoubt- edly belong in the genus Penthetria, yet are too imperfectly pre- served to render the species sufficiently characteristic for identifica- tion. Eighteen other examples are certainly bibionids, and it is highly probable that all belong to the genus Penthetria, so that of the whole number of Y3 insects, 54 may pertain to this bibionid genus Only one form belonging to this family was hitherto known f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
