104 GEOLOGICAL SURVEY OF NEW JERSEY. 



HYDATICUS, Leach. 

 H. piceus, Lee. 



Very rare, one specimen only ; Caldwell Crane. 



H. bimarginatus, Say. 



Anglesea, rare Liebeck. 



DYTISCUS, Linn. 

 D. harrisii, Kirby. 



Caldwell, common Crane. 

 D. fasciventris, Say. 



Camden, Gloucester and Atlantic counties Wenzel. Cald- 

 well, rare Crane. New Jersey Collection Roberts and United 

 States National Museum. Madison. 



D. hybridus, Aub<. 



New Jersey Collection Roberts and United States National 

 Museum. 

 D. verticalis, Say. 



New Jersey Collection United States National Museum. 

 Madison. 



ACILIUS, Leach, 

 A. semisulcatuB, Aube. 



Caldwell, common Crane. Newark. New Jersey Collec- 

 tion United States National Museum. 



A. fraternus, Harr. 



Anglesea, rare Liebeck. New Jersey Collection Roberts 

 and United States National Museum. Madison. 



A. mediatus, Say. 



Sea-shore, rare Liebeck. Camden, Gloucester and Atlantic 

 counties Wenzel. New Jersey Collection Roberts and United 

 States National Museum. Fort Lee, abundant Linell. 



THBBMONBCTES, Each. 

 T. basilaris, Harr. 



Generally distributed, moderately abundant Liebeck. New 

 Jersey Collection Roberts and United States National Museum. 



