Claire Weiss' Online Dicotomous Insect Identification Key

Examples


 
 

Mayflies (ephemeroptera) have large, triangle shaped front wings and significantly smaller hind wings.


courtesy Peter Maihofer

http://ohioline.osu.edu/hyg-fact/2000/2166.html
http://zebu.uoregon.edu/~dmason/Mckenzie/bugs/may.html
Pictured here is a mayfly at rest. 
When it's wings are extended, the difference in wing size is very noticeable. 
Outlined in the picture above is the hind wing of a mayfly at rest.