Tin 1 Oilo n at u or Druijonjiies of South Africa. 385 



in hind wing. One row of cells Rs-Rspl, Rspl not very distinct. ] 1 

 J,iq. Hind lobe of p rot borax moderate, erect, emarginati' in middle, 

 oiliate. Abdomen thin, cylindrical in <? ( <j> unknown). Third femora 

 in $ with very numerous (about 4-0) denticles, triangular in proximal, 



quadrangular in distal half Notiothemis. 



Discoidal field in front wing beginning with 3 rows of cells ; M 4 and Cuq 

 divergent from a level proximal to nodus and very much widened to 

 wing's edge ; Mspl very distinct, t in front wing with costal side 

 short, proximal and distal sides vei-y long. Proximal side of t in hind 

 wing at arculus. t crossed in front wing, free in hind wing. 1 CH/J in 

 hind wing. One or two rows of cells Rs-Rspl. M in deep double 

 curve. More than 10 Anq. (Plate X, fig. 4.) Hind lobe of pro- 

 thorax large, erect, ciliate. Frons prominent, with distinct anterior 

 ridge, flattened anteriorly, where two roughly triangular fields are 

 circumscribed by a fine elevated line. Abdomen depressed in male, 

 otherwise variable in form ; constricted at third segment and fusiform, or 

 broader and very gradually narrowed to end ; in female more cylin- 

 drical ; margins of eighth segment foliate ; vulvar scale small or absent. 

 Legs short and robust, spines small in femora, longer and more robust in 

 tibiae Orthetrum. 



4. Last A nq in front wing incomplete. (Plate X, figs. 5, etc.) . . .5. 



Last Anq in front wing complete. (Plate XI, fig. 8) ... 20. 



5. Costal vein in front wing in continuous curve from base to nodus. (Plate X, 



figs. 11, etc.) 6. 



Costal vein in front wing with an infraction about half way between base 

 and nodus. Wings variegated with black or black and yellow. Sectors 

 of arculus with separate origin or a very short common stalk in front 

 wing, a slightly longer common stalk in hind wing. 



1-2 Cuq in hind wing. Bqs mostly present (only genus of present fauna 

 with this character). Ciij in front wing short and strongly convex ; 

 3 (2) to 4 rows of cells in discoidal field, discoidal field not much widened 

 to wing's edge, a parallel curve of M 4 compensating the convexity of 

 Cu. Costal side of t in front wing comparatively long ; t crossed in 

 both wings. Anal field broad in hind wing ; A. 2 almost straight ; cells 

 between A 3 and wing's edge distinctly disposed in transverse rows. 

 Pterostigma large, two-coloured. (Plate X, figs. 5-10.) 

 Hind lobe of prothorax moderate. Abdomen short and depressed in 

 both sexes ; margins of eighth segment folded in female, no distinct vulvar 

 scale ........... Palpopleura. 



6. t in front wing considerably, by 3 or more cells' distance, distal to level of 



t in hind wing. Anal field in hind wings very broad. (Plate XI, figs. 6, 

 7) ... ... . .18. 



t in front wing on same level with t in hind wing, orbiit slightly, by not 

 more than 2 cells' distance, distal to same. (Plate X, fig. 11, and 

 Plate XI, figs. 1-5) ' . .7. 



7. 3/4 and C'j in front wing divergent from a level proximal to nodiis, dis- 



coidal field considerably widened to wing's edge. (Plate X, fig. 11, and 

 Plate XI, figs. 1-3) . . 8. 



