Occasional Papers of the Museum of Zoology 23 



Hydrophytic Habitats 



{Lake strand.) During their stay in the dune region Hussey 

 and the writer had the good fortune to witness several insect 

 drifts of varying size which were washed up on the shore of 

 Lake Michigan. These drifts contained a great variety of 

 insects, particularly of Coleoptera ; hut numljers of Orthop- 

 tera, Hemiptera, and Hymenoptera, and occasional insects of 

 other orders were noted. The proportion of aquatic or marsh- 

 inhabiting forms found in the drift was very large ; this fact. 

 together with certain observations made by Hussey on the 

 direction of the wind during and previous to the occurrence 

 of the principal drifts, seem to make it probable that a large 

 number of the insects came from the vicinity of Stevensville, 

 where the extensive marshes known as the "Grand Marais" 

 occur. The likelihood of this is increased by the fact that the 

 line of dunes, which elsewhere probably constitutes a consid- 

 erable barrier to insects coming from the landward side, at 

 that point nearly disappears, offering free access to the lake 

 from the interior. ' ' 



Since a considerable number of Orthoptera were taken in 

 the drift along the lake strand, it seemed desirable to record 

 them here, though this is obviously not a normal Orthopteran 

 habitat. A large number of the Acridids came ashore appar- 

 ently uninjured, and were able to fly in a short time. The 

 majority of the specimens taken exhibit the extreme macrop- 

 terous condition found in the species. A few apterous or 

 brachypterous specimens were taken in the drift, which were 

 probably caught by the waves while hiding under debris on 

 the beach, or while feeding on dead fish or insects previously 

 washed ashore. Species common in the drift on certain occa- 

 sions are indicated in the following list by a star: 



