264 



ME. W. F. KIEBY— A EEVISIOX OF 



98. Abdomen with segments 2-4 distinctly carinated *24. Brachytliemis. E. Indies. 



Abdomen with segments 2 and 3 distinctly carinated; 



sometimes 4 imperfectly. (99.) 



99. Frontal tubercle distinctly bifid 69. Erythemis. S. America. 



Frontal tubercle convex or concave, but not distinctly 



bifid. (100.) 



100. Abdomen not dilated at base ; wings and abdomen long 



and slender 46. Laihrecista. E. Indies. 



Abdomen stout; or if slender, more or less dilated at 

 base. (101.) 



101. Triangle of fore wings followed by two rows of cells in- 



creasing, or by one row of three cells, followed by a 

 series of two cells increasing. (102.) 

 Triangle of fore wings followed by three rows of cells 

 increasing. (105.) 



102. Abdomen short and broad ; wings short *23. Erythrodiplax. 



Abdomen more or less slender; wings not remarkably 



short. (103.) 



103. Abdomen distinctly dilated at base and tip 68. Micrathyria. 



Abdomen slightly and gradually dilated at base and tip, 



if at all. (104.) 



104. Abdomen slender ; first row of cells beyond the triangle 



of fore wings consisting of two cells ; subtriangular 



space consisting of two cells, rarely three *75. Diplacodes. 



Abdomen slender or moderate ; first row of cells beyond 

 the triangle of fore wings generally consisting of three 

 cells ; subtriangular space always consisting of three 

 or four cells *22. Triiliemis. 



105. Base and apex of abdomen greatly dilated 59. Sccqianea. 



Base of abdomen generally more or less dilated; the apex 



slightly and gradually, or not at all. (106.) 



106. Wings long, abdomen long and slender. (107.) 

 Wings moderately long, abdomen variable. (108.) 



107. Abdomen gibbous and inflated at base ; hind tibia? with 



two rows of five or six ver}' strong spines 66. Lepthemis. 



Abdomen gradually thickened ; hind tibise with shorter, 



slenderer, and more numerous spines . . 58. Dythemis. 



108. Hind tibia? with two rows of 5-7 very strong spines .... 67. Mesothemis. 

 Hind tibiae with shorter, slenderer, and more numerous 



spines. (109.) 



109. Male with the upper anal appendages curved upwards at 



the tips; female with the vulvar scale forked or bifid. . 21. Tlieeadiplax. China, Japan. 



These organs otherwise formed. (110.) 



110. Abdomen rather stout, hardly thickened at base. (HI.) 

 Abdomen slender or moderately stout, generally distinctly 



thickened at the base. (112.) 



S. America. 



America. 



Asia, Africa. 



Cosmopolitan. 

 Antilles. 



America. 



America. 

 America. 



