8 University of Michigan 



Remarks on the Hemiptera of Southern Michigan 

 The fauna of southern Michigan is in general similar to 

 that of the other northeastern States, and this holds true for 

 the Hemiptera as well as for other groups of animals. The 

 great majority of the species are wide-ranging forms which 

 are generally distributed throughout the northeast, but there 

 are other elements which enter into the composition of the 

 fauna. A few northern species, such as Gcrris rufoscittcllatus 

 and Notonecta instdata^ occur in all parts of Michigan ; but 

 other northern forms, though common near the tip of the 

 Peninsula, do not range southward far enough to come within 

 our limits : as examples we may cite Hom<emns ccneifrons, 

 Phytocoris lasiomenis, and Notonecta horealis. 



On the other hand, there are several species whose ranges 

 barely enter Michigan from the south : such forms are Thy- 

 anta custator, Lygccus turciciis, Sirthenea carinata, Atrachelus 

 cinereiirS, and Tenagogonus hesione. Enough is known of the 

 distribution of these forms to make it clear that they have 

 come into the State either directly from the south, through 

 Ohio and Indiana, or through the Mississippi Valley. No 

 Hemiptera were taken in Berrien County which can be defi- 

 nitely cited as examples of the "coastal plain" type of distri- 

 bution discussed above. 



^ ^ The Beach Drift 



The shores of Lake Michigan have long been noted for the 

 remarkable nature of their insect drift. Professor Needham, 

 more than twenty years ago, called attention to the fact that 

 occasionally one finds myriads of insects washed ashore, form- 

 ing regular windrows which sometimes extend for miles along 

 the beach. In a later papei'* he gives a more extended account 



'The Insect Drift of Lake Shores. Can. But., 49: 129-137, 1917. 



