OCR Text |
Show 1889.] MR. W. F. KIRBY ON N E W ODONATA. 301 sector from the second postnodal cross-nervure on the fore wings (exceptionally from the first or third), and from the first on the hind wings; the nodal sector rises at the 9th to the 13th cross-nervure (usually from the 10th) on the fore wings, and between the 6th and 8th on the hind wings ; and the ultranodal sector rises from two to four (usually two) cross-nervures further. The first postcostal nervule is placed very little beyond the first antenodal cross-nervure. The arculus is" angulated, and placed distinctly beyond the level of the second antenodal cross-nervure. The trapezium is about twice as long as broad ; its basal side is shorter than its outer, which is oblique, and its upper side is shorter than Tatocnemis malgassica. a. Insect, natural size. b. Extremity of abdomen, showing appendages, magnified 7\ times. its lower; there are from two to four cells (usually two) betw een the trapezium and the first transverse cross-nervure from above ; the lower sector of the trapezium rises on a level with the middle of the trapezium, and runs to the hind margin beyond the level of the origin of the ultranodal sector. Nodus placed at about one fourth of the length of the wing. Abdomen long and slender, first joint very short, second about 2\ times as long as broad, 3rd 4 times longer than the second, the rest gradually shortening to the 7th ; 8th about half as long as tbe 7th ; 9th and 10th each about half as long as the preceding ; upper anal appendages as long as the 9th segment, arched, with a large semicircular protuberance beneath ; lower appendages very short. Legs slender, not dilated, with long slender spines. A very remarkable genus, most nearly allied to Priocnocnemis, Selys ( - Hypocnemis, Selys, olim), from the Philippines, and Ldiocnemis, Selys, from New Guinea, the only genera of Odonata known with emarginate wings. It differs abundantly from both |