106 GEOLOGICAL SURVEY OF NEW JERSEY. 



DINBUTES, 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, Aube. 



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 HYDROPHILIDiE. 



HELOPHORUS, 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. scabratus, Muls. 



Generally distributed, common — Liebeck. Newark. New 

 Jersey — Collection United States National Museum. 



H. inaequalis, Lee. 



New Jersey — Collection United States National Museum. 



