260 



Jill. W. F. KIEBY — A REVISION OF 



36. Sectors of the arculus separated, or rising from a point 



or ver)' short stalk. (37.) 

 Sectors of the arculus distinctly stalked. (41.) 



37. Abdomen short, broad, much depressed 35, Libellula. Europe. 



Abdomen not remarkably depressed. (38.) 



38. Abdomen short and broad, with parallel sides ; at least 



two cross nervures in the lower basal cell of the fore 

 or hind wings. (39.) 

 Abdomen more or less tapering, one cross nerrnre (or two 

 on one side, rarely on both) in the lower basal cell of 

 hind wings. (40.) 



39. Triangle of fore wings not reticulated 41. Belonia. 



Triangle of fore wings reticulated 4. CamMinia. 



40. Abdomen stout, wings short, or moderately long *39. Leptetrum, 



Abdomen longer and more slender ; wings rather long . . 40. Plathemis. 



41. Pterostigma with the basal half pale *53. Hemisiigma. 



Pterostigma with the basal half not pale. (42.) 



42. Abdomen rather slender, distinctly dilated at base. (43.) 

 Abdomen variable, slightly, or not at all, dilated at 



base. (44.) 



43. Frontal tubercle bifid *48. Ar/rionoptera. 



!Frontal tubercle convex 47. Nesoxenia. 



44. Triangle of fore wings free 74. Orchithemis. 



Triangle of fore wings traversed. (45.) 



45. Abdomen slender, an opaque line running from the base 



on the lower costal space of all the wings, and 



ceasing before the nodus 54. Thermochoria. W. Africa. 



Wings with no such opaque line, or with a suffused line 

 in a similar position extending to the nodus. (46.) 



46. Wings more or less opaque, or if not, strongly suffused 



with yellow on the hind wings, at least at the base; 



abdomen rather slender, or moderately stout 11. Neurothemis. E. Indies. 



Wings hyaline, or opaque at the tip and in the centre ; 

 if any yellow or brown tinge is present at the base of 

 the hind wings, the abdomen is decidedly stout. (47.) 



47. Abdomen rather slender, as long as the hind wings ; 



wings often opaque at the tip or in the middle 55. TJraeis. S. America. 



Abdomen stout, generally shorter than the hind 

 wings. (48.) 



48. Fore wings with three or four supratriangular nervures . 36. TJntamo. Sula. 

 Fore wings with at most two supratriangular ner- 

 vures. (49.) 



49. Nodal and subnodal sectors very strongly curved at the 



extremity 37. Lyriothemis. E. Indies. 



Nodal and subnodal sectors very gradually curved at the 

 extremity. (50.) 



America. 

 Moluccas. 



Europe, Asia, Ame- 

 rica. 

 America. 

 Africa. 



E. Indies. 

 Solomon Islands. 

 E. Indies. 



