. Contributions to Canadian palæontology. Paleontology. 116 CONTEIEUTIONS TO CANADIAN PALEONTOLOGY Somewhat distally below the middle of the wing, the furcates into two slightly 'divergent branches. The posterior branch of the cubitus passes to the lower margin in a steep curve, not reaching the centre. The mediocubital cross-vein is situated two and a half times as far above the radiomedial cross-vein as is the latter above the fork Fig. 22.—Penthetria avus, Handlirsch. of the media. Directly below the cubitus and parallel with it runs a fold. The first simple anal vein diverges modera
. Contributions to Canadian palæontology. Paleontology. 116 CONTEIEUTIONS TO CANADIAN PALEONTOLOGY Somewhat distally below the middle of the wing, the furcates into two slightly 'divergent branches. The posterior branch of the cubitus passes to the lower margin in a steep curve, not reaching the centre. The mediocubital cross-vein is situated two and a half times as far above the radiomedial cross-vein as is the latter above the fork Fig. 22.—Penthetria avus, Handlirsch. of the media. Directly below the cubitus and parallel with it runs a fold. The first simple anal vein diverges moderately from the cubitus. Penthetria lanibei, sp. nov. Fig. 23. Locality: Tulameen river, opposite Vermilion cliff—(August 6, 1906. ). A subelliptical wing 11™" long, whose breadth is to its length in the ratio of 1:2-5. The radius is nearly straight, and stretches quite beyond seven-tenths the length of the wing. Its sector springs off at one-fourth the length of the wing, is strongly sigmoid, and bifurcates in half its own length. Its anterior branch is distinctly curved, and fuses in the margin midway between the radius and the posterior branch of the sector. The radiomedial crOss-vein is farther removed from the origin than from the fork of the sector, and lies almost precisely in the middle of the wing. Just below half the length of the wing, the media separates into two moderately diver- gent branches. The cvibitus with its posterior branch forms a gentle. Fig. 23.—Penthetria lambei, Handlirsch. curve, and strikes the posterior margin at half its length. The medio- cubital vein lies three times as far above the radiomedial cross-vein. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Survey of Canada. Ottawa, Printed by S. E. Dawson
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
