lo University of Michigan 



cially well represented : there were also numerous individuals 

 of Hydrophilus and of the larger Dytiscid species. Soft- 

 bodied forms were extremely rare, and small species were not 

 numerous : they were found chiefly on the days when the lake 

 was comparatively calm. Even the heavily chitinized forms 

 were often badly mutilated by the pounding to which they had 

 been subjected in the surf, which is very heavy here at times. 

 The effect of tides is negligible in Lake Michigan, and there is 

 a strong undertow when the waves are high, so that often- 

 times the insects remain in the surf for a considerable time 

 before they are finally washed up beyond the reach of the 

 waves. 



The great majority of the insects do not survive their 

 immersion in the lake, and after they have been washed up 

 on the sand and have dried they are at the mercy of the winds. 

 Thus, following any considerable drift, insects may be found 

 scattered over the sands in the blow-outs for a distance of 

 half a mile or more from the lake. Mr. D. H. Peattie tells 

 me that in August, 1920, he found several accumulations of 

 insects and miscellaneous debris on the inland slope of a low 

 dune (about 50 feet high) near Mineral Springs, Indiana, 

 over a quarter of a mile from the shore. 



Twenty-seven species of Hemiptera were taken from the 

 beach drift during July, 1920. Eleven of these have not been 

 reported by previous writers, and the total number of Amer- 

 ican Hemiptera now known from the drift line is raised to 

 118 species. The Berrien County list is given below, together 

 with the number of days on which each species was found. 

 An asterisk indicates a species not previously reported from 

 beach drift. 



Chlorochroa uhleri i E. euschtstoides 3 



Euschistus variolarius n *Mcncclcs iucertus I 



