318 Annals of the South African Museum. 



6. Very slender and elongate form (aid. 26, hdw. 19'5 mm.). No blue line on 



median thoracic suture. Pale colours very pure sky blue, yellowish on 

 sides of segments 3-6. 



A* proximal to Cuq by the length of Cuq or less . . E. elongatum. 

 Form less elongate (aid. 20, hdw. 13 5 to 24~5, pt. 1'7). A blue line on 

 median thoracic suture. Blue colour with a slight greenish shade. A* 

 proximal to Cuq by more than the length of Citg .... 7. 



7. Postocular spots comparatively small, united by a narrow blue line on occi- 



pital border, bordered with black posteriorly. Superior appendages 



chiefly black E. glaucum. 



Postocular spots very large, not bordered with black posteriorly, thus 

 confluent to bluish colour of occiput. Superior appendages chiefly blue. 

 Black colour on thorax and abdomen nmch reduced compared to 

 E. glaucum, .......... JE 1 . schultzei. 



8. Superior appendages broken on side view, the basal part spinulose, directed 



veiitrad, the apical part directed caudad, obtuse. Dorsal spine of inferior 

 appendages comparatively long and slender. Smaller than following 

 species ........... E.fractum. 



Superior appendages bent ventrad for their entire length, almost straight 

 on side view, distinctly sinuate in dorsal view. Dorsal spine of inferior 

 appendages short. 

 Larger than preceding species . . . . . . E. sinuatum. 



Table of Females. 

 (No females of Schultzei are known.) 



1. Black lines on legs, at least on first femora and tibiae. A black line on 



humeral suture (both comparatively narrower than in corresponding 

 males) ............. 2. 



No black lines on legs, a very narrow one or none at all on humeral 

 suture . 5. 



2. Cuq nearer to first than second Anq. Green or bluish ante-humeral line very 



little broader than in corresponding male, narrower than humeral black 

 stripe. Hind lobe of prothorax very narrow, almost straight, very 

 slightly convex in the middle E. nigridorsum. 



Cuq at equal distance from first and second Anq, or nearer second. Green 

 or bluish ante-humeral line broader than in corresponding male by the 

 reduction of humeral black stripe . . . . . . .3. 



3. Posterior lobe of prothorax regularly convex or projecting in a very low 



triangle ............ 4. 



Posterior lobe of prothorax raised in the middle in a trapezoid pro- 

 jection, which is regularly and shallowly concave at the posterior free 

 margin. Wings comparatively broad ; pterostigma very little longer 

 than broad ......... E. rotundipenne. 



4. Posterior lobe of prothorax very narrow, its median third projecting as a 



very low and obtuse triangle. Slightly larger and more robust than the 

 following species ....... E. subfurcatum. 



Posterior lobe of prothorax broader, regularly convex, sometimes with 

 an indication of a median tubercle . . . . . E. glaucum. 



