Interested in confirmation. I have never knowingly seen the species before. This is a female Gomphus. In the field, took it to be yet another G. militaris, like so many I have photographed before in the area. However, this individual differs ....
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S9 is flared laterally unlike female militaris
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The color is a striking yellow on black for all abdominal segments'.
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color pattern of dorsal S8-10 fits graslinellus
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color pattern of lateral S7-9 fits graslinellus and does not fit G. militaris.