1889.] 



MR. TV. 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 I3tl) cross- 

 nervure (usually from the lOth) 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 furtlier. 'i'he 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 malgassioa. 



a. lusect, natural size. 



6. Extremity of abdomen, showing appendages, magnified 7^ times. 



its lower ; there are from two to four cells (usually two) between 

 the trapezium and the first transverse cross-nervuie 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 the 7th ; 

 9th and lOth 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 genu«, most nearly allied to Priocnocnemis, 

 Selys {=Hypocnemis, Selys, olim), from the PhiHppines, and 

 Idiocnemis, Selys, from New Guinea, the only genera of Odonata 

 known with emarginate wings. 



It differs abundantly from both 



