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Photo#372394
closeup of margin of median lobe of prementum, Chalk-fronted Corporal - Ladona julia

closeup of margin of median lobe of prementum, Chalk-fronted Corporal - Ladona julia
Kellys Bog, Kouchibouguac National Park, Kent County, New Brunswick, Canada
June 28, 2009
Please compare with rather smooth margin of median lobe of prementum of Libellula quadrimaculata here: , as per fig 437, p 606 in Needham , Wesfall and May 2000. In the key, this is how we distinguish between Libellula/Cannaphila vs. Ladona/Plathemis larvae/exuviae. In Ladona/Plathemis, the margin is quite ROUGH or CRENULATE as in the above image...