1889.] MR. W. F. KIRBY ON NEW 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 !3th 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 tevel 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 
Tutocnemis malgassica. 
a. Insect, natural size. 
6. Extremity of abdomen, showing appendages, magnified 73 times, 
its lower; there are from two to four cells (usually two) between 
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 22 
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 the 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 semi- 
circular protuberance beneath ; lower appendages very short. 
Legs slender, not dilated, with long slender spines. 
A very remarkable genus, most nearly allied to Prioenocnemis, 
Selys (=Hypocnemis, Selys, olim), from the Philippines, and 
Idioenemis, Selys, from New Guinea, the only genera of Odonata 
known with emarginate wings. It differs abundantly from both 
