114 Needham New Genus and Species of Libellulinae. 



increasing but slightly to the margin; but one cubitoanal crossvein in the 

 hind wing before the triangle ; anal loop scarcely foot shaped, short, of two 

 rows of cells with a single interpolated cell at the bend. Legs slender, 

 femora spineless. Abdomen very slender, compressed at base, segments 2 

 and 3 carinate, appendages very long. 

 Type, the following species. 



Edonis Helena sp. nov. 



Length, 29mm. ; abdomen, 20 mm.; hind wing, 19 mm. ; male. 



A blackish, slender bodied, white faced species, with richly colored wings 

 that are blotched with brown at base and iridescent-hyaline beyond. Eyes 

 brown, paler on the superior, smaller- facetted portion. Face cream white, 

 dotted with very minute brown punctures. Labrum black except two 

 small oblique whitish streaks upon its base. Labium blackish. Frons 

 above and vertex steel blue; ocelli narrowly ringed with cream white, the 

 median ocellus twice as large as the others. Eyes contiguous for a space 

 as great as the diameter of the vertical tubercle or of the occipital triangle. 

 The latter is dark brown above, whitish behind, where divided by a me 

 dian vertical furrow, and thinly clad with pallid hairs ; rear of eyes shining 

 black. 



Prothorax black, its posterior lobe erect, entire, fringed with long white 

 hairs. Thorax proper, brown in ground color, black below, and on the 

 sutures ; carina pale with a broad black stripe each side of it, the stripes 

 confluent below, but isolated above and not reaching the antealar crest. 

 Legs black, claws brown, front femora pale beneath ; claws with a straight 

 and rather large inferior tooth. Femora with spines rudimentary, the 

 outer row represented by mere prickles, the inner one by pallid hairs. 

 Wings diffusely marked with brown at base, the fore wings faintly marked 

 as far as the triangle, the hind wings deeply suffused, excepting on the hind 

 margin, almost to the level of the nodus. Venation as stated for the 

 genus ; and to be further noted, there is in each wing a sharply defined 

 supplement (or supplementary loop) of three cells behind the radial sector 

 while there is no median supplement at all ; the second crossvein between 

 the bases of the first and second branches of the median vein is hardly at 

 all reversed or inclined. 



The abdomen is long and slender, hardly dilated on the basal seg 

 ments, but rather compressed, and there is a distinct median trans 

 verse carina only on segments 2 and 3. The color is blackish, with 

 a longitudinal streak of pale brown upon either side of segments 2 to 

 7, and a short basal spot in the same position each side of segment 8. Seg 

 ments 8, 9, 10 and appendages black. The anterior lamina is prominent, 

 roundly notched on its free ventral margin, and bears a brush of stiff 

 bristles in two dense patches on its ventral surface. The hamule is stout, 

 its anterior lobe is uncinate, its posterior obtuse, spiniferous; genital lobe 

 broad, spiniferous ; vesicle spherical, smooth. 'The terminal appendages 

 are hardly shorter than the last three segments taken together ; the super- 



