THE SUBFAMILY LIBELLULIN^l. 289 



segments 2 and 3 carinated, segment 8 perfoliate in the female : wings and pterostigma 

 very long, the latter rather narrow, and slightly pointed at the tip ; fore wings with 

 16-19 antenodal nervures, the last exceptionally discontinuous from irregularity of 

 those in the lower costal area, and 10-16 postnodal nervures, the last three or four not 

 continuous, cells of the postnodal area simple, triangle moderately long, situated just 

 beyond that of the hind wings, traversed by 1-3 (generally two) cross nervures, and 

 followed by four rows of cells, and afterwards by three, increasing (by five or four, 

 or four increasing in some species), generally one or two supratriangular nervures 

 (sometimes wanting), one cross nervure in the lower basal cell, subtriangular space 

 consisting of 3-7 cells, sectors of the arculus rising from a point and moderately 

 curved at the extremities, nodal sector much waved in the middle, subnodal very 

 slightly, the intermediate cells beyond the wave being divided into rows of two, three, 

 and sometimes at the extremity even four cells, lower sector of the triangle rather 

 long, regularly undulating; hind wings a little broader than the fore wings, with 

 11-11 antenodal nervures, the last sometimes not continuous, and 12-19 postnodal 

 nervures, the first four not continuous, triangle traversed, followed by three or four 

 rows of cells, then two, increasing (exceptionally three), a supratriangular nervure 

 rarely present, one cross nervure in the lower basal cell, sectors of triangle united at 

 base: anal appendages of the male rather shorter than the last two segments, the 

 lower one-third shorter than the others; appendages of the second segment incon- 

 spicuous ; spines of the legs not numerous, straight, rather slender. 

 Type Lihellula axilena, Westw. (=lgdia, p., Dru.). 



Genus 43. Thermorthemis, g. n. 



Frontal tubercle bifid ; abdomen as long as the wings, broad, but not depressed, 

 with the usual dorsal and lateral carinse, and transverse carina? on the second and third 

 segments, and eighth segment of the female perfoliate : wings moderately long and 

 broad, tips rather pointed, pterostigma very long; fore wings with 19-22 antenodal 

 and 12-11 postnodal nervures, last antenodal nervure continuous, first three or four 

 postnodals not continuous, cells of the lower postnodal space not bisected, triangle 

 long, traversed by two or three nervures (very rarely one), and followed by four or five 

 rows of cells, two or three supratriangular nervures, subtriangular space consisting of 

 six or seven cells, sectors of the arculus stalked, considerably arched at the extremities, 

 nodal sector waved, cells between the nodal and subnodal sectors bisected towards the 

 hind margin ; hind wings distinctly broader than the fore wings, the triangle always 

 traversed, and always with one supratriangular nervure, sectors of the triangle united 

 at base. 



To include Lihellula caffra, Burm., angustiventris and madagascariensis, Ramb. ; 

 the last may be regarded as the type. 



vol. xii.— part ix. No. 6. — August, 1889. 2 u 



