310 ME. W. F. KIEBY— A EEVISION OF 



nervures in the lower basal cell, sectors of the triangle distinctly separated at their 

 origin : anal appendages of the male short, rather slender, and curved downwards. 



Type Tetrathemis irregularis, Brauer. 



In the case of aberrant genera like this, it is often necessary to place several rather 

 dissimilar forms together until they are better known, and the limits of their variation 

 can be more positively ascertained. 



Genus 80. Beachygonia, g. n. 



Frontal tubercle rounded ; eyes large, contiguous in front ; abdomen nearly as long 

 as the hind wings, moderately slender and slightly tapering, segments 2 and 3 cari- 

 nated: wings rather long and narrow, pterostigma moderate; fore wings with 6-7 

 antenodal and 5 postnodal nervures, the first two (rarely three) postnodals not con- 

 tinuous, cells of the postnodal area simple, triangle converted into a trapezium, the 

 outer angle being truncated, but very slightly, free, followed by two rows of cells, 

 separated by a line zigzag to the middle of the wing, and then nearly continuous, 

 no supratriangular nervures, subtriangular space consisting of one cell (rarely divided 

 by a curved line), sectors of the arculus stalked, very slightly curved, lower basal cell 

 with one cross nervure, the nodal sector hardly waved, even at the base, the subnodal 

 sector more or less irregular beyond the middle, cells between the nodal and subnodal 

 cells simple, no closed cells below the lower sector of the triangle; hind wings not 

 much broader than the fore wings, with 5 antenodal and postnodal nervures, the first 

 two postnodals not continuous, triangle free, very short, its base halfway between its 

 apex and the arculus, followed by two rows of cells, no supratriangular nervures, one 

 cross nervure in the lower basal cell : anal appendages of male slender, as long as the 

 eighth segment, the lower segment nearly as long as the upper ones, sectors of the 

 triangle separated by at least half the length of its outer side, or more ; appendages of 

 the second segment distinct, not very prominent. 



Type Tetrathemis oculata, Brauer. 



In all the specimens of the male the abdominal segments 2 (behind the carina), 3, 

 and 4 to the middle are dusted with pale blue. This is absent in the only female 

 specimen. 



Genus 81. Nephepeltia, g. n. 

 Allied to Nannothemis, but the middle segments of the abdomen very long and 

 slender, the basal and terminal segments (especially the seventh and eighth) much 

 dilated ; the hinder part of the pectus with a very strong spine, pointing backwards ; 

 upper anal appendages in the male longer than the eighth segment, depressed and 

 recurved, the lower appendage only half as long as the others ; appendages of the 

 second segment very prominent : fore wings with 6 antenodal and 5 postnodal nervures ; 

 hind wings with 5 of each, all the first postnodals not continuous ; trapezium of fore 



