448 



Tabular Summary 



Wings moderately Wings moderately Wings broad or nar- 

 broad at base broad at base row at base 



Large number of Keduetion in the 



Large number of ir- 

 regular cells 



polygonal cells 



number of 

 onal cells 



poly? 



Subcosta ending in Subcosta en d i n gjSubcosta ending at 

 costa beyond the about the middle middle of the 

 middle of the of the wing; not wing; forked; no 

 wing; not forked; forked; no nodus dus present 

 no nodus 



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



Eadial sector not 

 crossing media 



Eadius and media 

 not fused at base 

 and no ar cuius 

 formed 



Stigma absent 



costa and subcosta 

 22-50 or more 



Eadial sector appar- 

 ently not crossing 

 media 



veins much re- 

 duced, u s u al 1 y 

 more than two in 

 number 



Radial sector 

 ing media 



Eadius and media Eadius and media 



fused but no arcu- 

 lus formed 



Stigma absent 



M, arising proximad 

 of end of subcosta 



fused and arculus 

 frequently formed 



Arcnlus near the 

 base of the wing 



S t i g m a sometimes 

 present 



Stigma not support- 

 ed by oblique 

 cross-veins or sup- 

 plementary sectors 



M, 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. 



Eadial sector cross- 

 ing media. 



Eadius 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. 



M, arising at the 

 subnodus or con- 

 siderably beyond. 



Stigma cells few in 

 Zygoptera. 



