THE SUBFAMILY LIBELLULLN^E. 293 



Genus 49. Chalcostephia, g. n. 



Male. — Frontal tubercle convex ; eyes contiguous for rather a long space ; abdomen 

 moderately broad, a little narrowed in the middle, hardly thickened at the base, as 

 long as the hind wings, segments 2 and 3 carinated : wings moderately long and broad, 

 rounded at the tips, pterostigma rather long; fore wings with 11 antenodal nervures, 

 the last not continuous, and 8-9 postnodal nervures, the first two not continuous, cells 

 of the postnodal subcostal area simple, triangle rather short and broad, free, placed 

 distinctly beyond that of the hind wings, the lower sector of the arculus striking the 

 base a little before the outer angle, but hardly breaking it, followed by two rows of 

 rather large cells, increasing, subtriangular space consisting of three cells, sectors of the 

 arculus stalked, moderately curved at the extremities, the lower one a little irregular, 

 no supratriangular nervures, one cross nervure in the lower basal cell, nodal sector only 

 slightly waved towards the base, moderately curved at the extremity, subnodal sector 

 straighter, intermediate cells only bisected close to the hind margin ; hind wings 

 slightly broader than the fore wings, with 9 antenodal and 8 postnodal nervures, 

 the first two postnodals not continuous, triangle free, placed considerably beyond 

 the level of the arculus, followed by two cells, then by one increasing, no supra- 

 triangular nervures, one cross nervure in the lower basal cell, sectors of the triangle 

 united at the base : upper anal appendages as long as the last two segments of the 

 abdomen, depressed, the extremities much thickened and pointed, lower appendage a 

 little shorter ; appendages of the second segment very small. 



Type Chalcostephia flavifrons, sp. n. 



Genus 50. Raphismia, g. n. 

 (Neuration, Plate LVI. fig. 4.) 

 Allied to Brachydiplax. Fore wings with 9-10 antenodal and 6-8 postnodal cross 

 nervures, the last antenodal and the first two postnodals not continuous, triangle 

 equilateral, followed by two rows of nervures, subtriangular space consisting either of a 

 single very large cell, or divided by a perpendicular line ; hind wings with 7 antenodal 

 and 6-7 postnodal nervures, the first two of the latter not continuous, triangle rather 

 narrow, commencing considerably beyond the arculus (with which its base always 

 coincides in Biplacodes) : male with two small spines projecting from the middle of 

 the metasternum, and the appendages beneath the second segment of the abdomen 

 also prominent, and exhibiting two small hooks, directed backwards, as in some 

 species of Tramea. 



Type Diplax lispina, Hag. 



Genus 51. Anatta, g. n. 

 (Plate LIII. fig. 9 ; appendages, Plate LVII. fig. 7.) 

 Frontal tubercle convex ; eyes contiguous in front ; abdomen rather slender, as long 



