1 1(> BIOLOGICAL sriiVKV OF 



Hadaticus Leach 



II. modestus shp. (i!(>47). This is the H. stagnalis of authors 

 not (Fab.). When (it. Heath touches Middle Road. Pools 

 always shaded, station F384. 



Ai iurs Leach 



A. semisulcatus Aube (2651). Probably the most generally 



distributed of this family, being in most of the small ponds 

 from the first of July until October. 



Graphoderes Thomson 



Gr. LiHF.urs (Say) (2().">})). The only place this beautiful 

 form was taken was in the pool in the center of Sunken 

 Heath where they were in numbers. Station F345. 



G. cinebeus (Linn.) (26(50). One specimen taken Station 

 F129. Scarce. 



Gtrinidae. The Whirligig Beetles 

 Taken by netting them on the surface of the water. 



Dinettes MacLeay 



Every place was searched for this genus in 1939 with the 

 result that D. horni was taken at nineteen stations and D. 

 nigrior at sixteen. 



I), nigriob Robts. (2679). See above. 

 I), americanus Say. (2680). Record of capture lost. 

 I), horni Robts. (2681). See above. 



O.YRixrs Geoffroy 



Iii 1939 Mr. K. F. Chamberlain of New York State Museum, 

 most kindly offered to determine for me in any quantity the 

 species that 1 would collect in the above genus, thus making 

 it possible tor me to make a thorough check of the Island. I 

 started in the first of May when there was snow in the woods 

 and at one time or another I visited every brook, lake, marsh, 

 or other bit of water that I could find. The result is given be- 



