VOL. XVIII, PP. 113-116 MARCH 31, 1905 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW GENUS AND SPECIES OF LIBELLULINAE FROM 



BRAZIL. 



BY JAMES G. NEEDHAM. 



I have long had it in mind to make known an interesting new 

 dragonfly that Mr. Adolph Hempel sent me from Ypiranga, 

 Brazil, in 1898. Two male specimens were sent me, collected 

 on the same day. I reported them back as new, and waited for 

 Mr. Hempel to describe them ; but he became engrossed with 

 important work on scale insects, and gave up all thought of work 

 on the Odonata, and asked me to describe the new forms that 

 he had sent me. There are perhaps a number of new species 

 among them, but only this one that seems to represent a new 

 genus ; and in view of the present activity in the study of the 

 Libellulinae, I deem it advisable to make this one known. 



Edonis gen. nov. 



Eyes contiguous for a rather long space ; frontal tubercle obtusely rounded; 

 hind dorsal lobe of the prothorax broadly rounded and entire; venation 

 open, six antenodals in the fore wing and fiv 7 e in the hind wing, all com 

 plete, and five postnodals in each wing, the first two discontinuous ; a sin 

 gle crossvein under the stigma, with a long cell before it; one extra cross- 

 vein in the space which the bridge encloses ; arculus situated nearly mid 

 way between the first and second antenodals ; sectors of the arculus long- 

 stalked ; no crossvein in triangle, subtriangle or supertriangle of either 

 wing ; two incomplete rows of cells beyond the triangle in each wing, 

 17 PROC. BIOL. Soc. WASH., VOL. XVIII, 1905. (113) 



