52 Journal New York Entomological Society. [Vol. xxi. 



In a brook in the woods at Marion, Mass., Mr. Bowditch and his 

 friends find Agabits gagatcs Aube in great numbers and deeper, 

 among the submerged roots, the less active Agabus planatus Sharp. 

 In my own experiences at Marion gagates outnumbered planatus 

 about a hundred fold. 



Another common brook species of Hydroporus both at Marion, 

 Mass., and Ash Grove, Va., and elsewhere, is the beetle which has 

 passed so long in collections as vitiosus Lee. and which was de- 

 scribed under this name by Dr. Sharp, although it is really quite a 

 different species for which I shall suggest the name blanchardi. 



Deronectes depressus Fabr. and Haliplus cribrarius Lee, as well 

 as Hydroporus solitarhis Slip, occurred in the bed of the small " river " 

 between Mountain Lake and Cliff Lake in the Huron Mountain 

 region of Lake Superior, where the current is quite strong, the 

 water being perhaps two or three feet deep and full of eel-grass. 



Amphizoa lives in the swift mountain streams on the Pacific coast. 

 So does Hydrotrupes palpalis Sharp, according to Fall. 



Our smallest Dytiscid, Notomicrus nanuhis Lee, is another inter- 

 esting species living in running water, found by Mr. Schwarz in mid- 

 summer on the underside of logs swept against a bridge over the 

 Pell River at Bartow, Fla. 



One of the meadow pond species mentioned by Needham, Cff/- 

 ambus acaroides Lee, lives also in the brook at Edge Brook, 111. In 

 July, 1911, I collected this species a few days apart, in a muddy pond 

 near St. Paul, Minn., and at Edge Brook. The brook specimens 

 were clean and bright ; those taken in the muddy water were dark and 

 dirty in appearance. This species and Agabus gagates Aube are two 

 of the very few brook species which are also at home in still water. 

 The species of the genus Agabus however are more properly to be 

 considered as belonging to the fauna of springs. 



Sometimes, however, these brook species are carried away by 

 freshets from their home and found elsewhere. An interesting in- 

 stance of this came under my observation in August, 1903, when 

 we were camping on Esopus Island in the Hudson River. The very 

 heavy rains of that month converted into a torrent Black Creek which 

 empties into the river opposite the island, and hundreds of specimens 

 of Hydroporus pulcher Lee. were swept half way across the Hudson 

 River to the shores of the island, wher^ they were found under stones 

 and pebbles at low tide. 



