Occasional Papers of the Museum of Zoology 3 



3a. Distal thickened antenodal the sixth or more distal : 

 Epigomphiis, Leptogomphus, Macrogomphus. 



4. One cubito-anal cross-vein in addition to the inner side 



of the subtriangle: Archaeogomphus, Agriogomphiis, 

 Cyanogomphiis, Ischnogomphiis, Leptogomphus, 

 Macrogomphus, Microgomphus. 

 4a. Two cubito-anal cross-veins in addition to the inner side 

 of the subtriangle: Agriogomphus, Epigomphus, 

 Macrogomphus, Microgomph us. 



5. One row of postrigonal cells in the front wings: Archae- 



ogomphus, Agriogomphus. 

 5a. Two rows of postrigonal cells in the front wings : Cyano- 

 gomphus, BpigompJius, IscJinogouiphus, Leptogom- 

 phus, Macrogomphus, Microgomphus. 



6. One row of postrigonal cells in the hind wings: Archaeo- 



gomphus, Agriogomphus, Cyanogomphiis, Epigom- 

 phus. 

 6a. Two rows of postrigonal cells in the hind wings : Cyano- 

 gomphus, Epigomphus, Ischnogomphus, Leptogom- 

 phus, Macrogomphus, Microgomphus. 



7. Anal area of the front wings one cell wide: Archaeogom- 



pJius, Agriogomphus, Ischnogomphus, Microgomphus. 

 7a. Anal area of the front wings two or more cells wide : 

 Cyanogomphus, Epigomphus, Leptogomphus, Macro- 

 gomphus. 



8. Two postanal cells in the hind wings: Archaeogomphus, 



Agriogomphus, Cyanogomphus, Ischnogomphus, 



Microgomphus. 

 8a. Three postanal cells in the hind wings: Cyanogomphus, 



Epigomphus, Leptogomphus. 

 8b. Four postanal cells in the hind wings : Leptogomphus, 



Macrogomphus. 



