S. Ross et Mf. O'Brien, Williamsonia lintneri (Odonata : Corduliidae) - A first Michigan record with additional notes on W-fletcheri, GT LAKE ENT, 32(3), 1999, pp. 201-205
Williamsonia lintneri is newly recorded for Michigan, and additional Michig
an sites are given for W. fletcheri. Both species appear to be bog/fenoblig
ate inhabitants, and adults may appear as early as late April in Michigan.
In addition, the North American distributions of both species are summarize
d.