100 BIOLOGICAL SURVEY OF 



Gyrintjs Geoffroy 



G. FRATERNus? Coup. (2686). One female taken Aug. 7, '34 



in New Mill Pond which Chamberlain says may be this 



species. 

 G. AENEOLus LeC. (2687). One specimen taken Aug., '32, of 



which the record of capture has been lost. Scarce. 

 Q. DiCHROus LeC. (2689). On Aug. 7, '34 a large number of 



both sexes were taken in New Mill Pond. Not taken in other 



ponds. 

 G. AFPiNis Aube (2696). A male and a female taken in New 



Mill Pond, Aug. 7, '34, but not taken elsewhere. 

 G. BOREALis var. LUGENs LcC. (2707a). Ice ponds Manset, 



July 15. On Aug. 7 , '34 a large number of both sexes were 



taken in New Mill Pond. 

 G. PUGiONis Fall. (19255). Salisbury Cove, July 29-Aug. 10. 



Not common. 

 G. AssiMiLis Aube. Record of capture lost. 



Hydrophilidae. The Water Scavenger Beetles 

 By raking out aquatic vegetation or scraping the bottom 

 and among reeds is the way to capture these. 



Helophorus Fabricius 



H. sp. A large number found in wet rubbish Bar Harbor, 

 May 2 (Br.). 



Berosus Leach 



B. STRiATus (Say) (2784). Pond in Eden, Aug 13 and New 

 Mill Pond, Aug. 7. Not common. 



Hydrophilus DeGeer 



H. OBTusATus Say (2795). On July 24-26 a few were taken 

 in a pond near Bar Harbor. Scarce. 



Tropisternus Solier 



T. GLABER (Hbst.) (2805). Witches Hole; Salisbury Cove, 



June 13-Aug. A rather scarce species. 

 T. MixTus (LeC.) (2806). Station F137, Sept. 30; Station 



F137, Oct. 5. Not common. 



