Annals of the South African Museum. 



18. One cubito-anal cross-vein in hind wing. M almost straight. Basal 



abdominal segments with not more than one transverse carina . 19. 

 In hind wing- a second cubito-anal cross-vein, running obliquely to 

 proximal angle of t. Very deep double curve of J/.-,. Very long anal 

 loop, consisting of two rows of cells, or at most one interpolated cell at 

 external angle, with A^ bent in gentle curve ; A 3 fractured near base ; 

 a supplementary sector arising at the angle divides the anal field in a 

 proximal part of small cells, which are arranged in transverse rows, and 

 a distal part of more ordinary, less regularly arranged cells. Pterostigma 

 small, longer in front than in hind wing. Abdominal segments 3 and 4 

 with two supplementary transverse carinae (besides the normal one), 5 

 also with a transverse carina Pantala. 



19. Pterostigma small, longer in front than in hind wing. 



Costal side of t in front wing very short, proximal and distal sides very 

 long. Anal loop long, with interpolated cells at anal angle of t and at 

 external angle ; with A* strongly bent and distal part of A 3 often 

 partially dissolved. Anal field between A 3 and wing's edge as in Pantala. 

 Colour predominantly red ; brown or brown and yellow basal spot in 

 hind wings. Large forms ........ Tramea. 



Pterostigma about equal in both pairs of wings. Costal side of t in 

 front wing comparatively long. Anal loop less elongate, with A 2 almost 

 straight and end of A- A not dissolved. Partition of anal field between 

 A 3 and wing's edge not so distinct. Colour predominantly bronzy black ; 

 wings with metallic black or black and yellow markings. (Plate XI, 

 figs. 6, 7.) Smaller forms Ehyothemis. 



20. Number of Anq small (6-7). Sectors of arculus in front wing separated or 



with common stalk very short, t in front wings free. Two rows of cells 

 in cliscoidal field of front wings, or once 3 cells at t. One row Rs-Rspl. 



(Plate XI, fig. 8) .. . 21. 



Number of An q greater (more than 10). Sectors of arculus with long 

 common stalk in both wings, t in front wings crossed, 3 rows in dis- 

 coidal field ; 2 rows Rs-Rspl. General fades, colour system and 

 genitalia much as in Trithemis ...... Helothemis. 



21. Larger forms, ti in front wings 3-celled ; about 5 rows between A 3 and 



wing's edge in hind wing. (Plate XI, fig. 8.) Abdomen comparatively 

 short and broad, depressed, gradually narrowed hindward in male, more 

 cylindrical in female. No external branch in hamule of male ; vulvar 



scale large in female Urothemis. 



Small forms, ti in front wing free ; 2-3 rows between A- A and wing's 

 edge in hind wing. Abdomen similar in shape to preceding genus, also 

 genitals of both sexes Tethriamanta. 



NOTIOTHEMIS, uov. gen. 



This genus is isolated in the present fauna, and belongs to a group 

 of forms well represented in tropical Asia, in Madagascar and also in 

 continental Africa, though everywhere in a limited number of species. 



