448 



Tabular Sommabt 



PAI4EODICTYOPTEEA 



Dictyoneuridae 



Peotodonata I 



Odonata 



Meganeuridae 



Protagrionidao 



Paralogidae 



Anisozygoptera 

 Archizygoptera 



Zygoptera 

 Anisoptera 



Wings moderately iW i n g s moderately Wings broad or nar- 

 broad at base broad at base row at base 



Large number of ir- 

 regular cells 



Largo number of Reduction in the 



polygonal cells 



number of polyg- 

 onal cells 



Subcosta ending in'Subcosta e n d i n g Subeosta ending at 

 costa beyond the about the middle middle of the 

 of the wing; not' wing; forked; no- 

 forked; no nodus I dus present 



middle of the 

 wing; not forked; 

 no nodus 



Radial sector not 

 crossing media 



Radius and media 

 not fused at base 

 and no arculus 

 formed 



Stig^ma absent 



Cross-veins between A n t e n dal cross- 

 eosta and subcosta veins much re-l 

 ""-50 or more duced, usually 



more than two in 

 number 1 



Radial sectcr appar- 

 ently not crossing 

 media 



Radial sector cross- 

 ing media 



Radius and media Radius 

 fused but no arcu- 

 lus formed 



Stigma absent 



Mj arising proximad 

 of end of subcosta 



and media 

 fused and arculus 

 frequently formed 



Arculus near the 

 base of the wing 



Stigma sometimes 

 present 



Stigma not support- 

 ed by oblique 

 cross-veins 'or sup- 

 plementary sectors 



Mj arising near the 

 subnodus, often 

 slightly proximad 



Stigma cells numer- 

 ous 



Wings broad or nar- 

 row at base. 



Still greater reduc- 

 tion in number of 

 polygonal cells in 

 Zygoptera. 



Subcosta often end- 

 ing proximad of 

 the middle; 

 forked ; nodus 

 present. 



Antenodal cross- 

 veins often re- 

 duced to two in 

 Zygoptera; more 

 than two present 

 in Anisoptera, 



Radial sector cross- 

 ing media. 



Radius and media 

 fused and arculus 

 always formed. 



Arculus further dis- 

 tad from the base. 



Stigma only occa- 

 sionally absent. 



Stigma supported by 

 oblique cross- 

 veins, supplemen- 

 tary sectors, or 

 both. 



Mj arising at the 

 subnodus or con- 

 siderably beyond. 



Stigma cells few in 

 Zytjoptera. 



