106 GEOLOGICAL SURVEY OF NEW JERSEY. 



DINEUTBS, MacL. 

 D. vittatus, Germ. 



Generally distributed, moderately abundant Liebeck. At- 

 lantic county, common Wenzel. Newark. Clifton, Ccean 

 county, in ditches and small streams, never in ponds Smith. 



D. discolor, An be. 



Ocean county, common Smith. New Jersey Collection 

 Roberts and United States National Museum. 



D. assimilis, Aub6. 



Generally distributed, moderately abundant Liebeck. At- 

 lantic county, common Wenzel. Clifton, Ocean county, com- 

 mon Smith. New Jersey Collection Roberts and United 

 States National Museum. 



D. emarginatus, Say. 



Generally distributed, moderately abundant Liebeck. 



Family HYDROPHILIDJE. 



HBLOPHORUS, Fabr. 

 H. lacustris, Lee. 



Hoboken, common Linell. Palisades, common Smith. 



H. lineatus, Say. 



Generally distributed, common Liebeck. Newark. New 

 Jersey Collection United States National Museum. 



H. tuberculatus, Gyll. 



Westville, rare Liebeck. 



HYDROCHUS, Leach. 

 H. ecabratus, Muls. 



Generally distributed, common Liebeck. Newark. New 

 Jersey Collection United States National Museum. 



H. insequalis, Lee. 



New Jersey Collection United States National Museum. 



