Occasional Papers of the Museum of Zoologv 3 



vicinity. Collections were made at frequent intervals during 

 the summer at most of these stations, but a few of them 

 were visited only once or twice. The same plan was followed 

 during the other years, though somewhat less systematically 

 in 1914. 



Station I was the site of the Biological Station itself, on the 

 south-east shore of South Fishtail Bay, and was selected as a 

 matter of convenience. Only insect drift, washed up on the 

 bare sandy beach, was found here. 



Station II was a portion of the east shore, about 100 yards 

 long, where the beaches were unusually wide. It was com-, 

 pletely exposed to wind and to wave action, and received a 

 maximum amount of light. Here were a number of small 

 standing pools which were cut off from the main lake by the 

 inwash of sand and by the falling of the water level of the lake 

 during the summer. The vegetation consisted chiefly of rushes 

 (Scirpus spp.), with some Equisetum and a few scattered 

 grasses and sedges. The insects found here were chiefly Dip- 

 tera, tiger-beetles, ants, and grasshoppers, and were most 

 numerous near the edge of the water. Gerris marginatiis and 

 Saldiila pallipcs were the only Hemiptera taken at this station. 



Station III was a series of exposed beach pools on the east 

 shore near North Fishtail Bay. During July, as the water 

 level in the lake dropped rapidly, the pools at the south end of 

 the group dried up, and most of the collecting was done in 

 the north-east pool of the series. 



At the beginning of the summer the water in this pond cov- 

 ered an area some thirty-five yards in diameter, and was 

 connected directly with Douglas Lake by a narrow channel 

 through the low sandy bank which separated the two bodies 

 of water. Emergent and floating vegetation extended in from 

 all sides and covered the pool, except for an open-water area 



