100 GEOLOGICAL SURVEY OF NEW JERSEY. 



Family DYTISCIDiE. 



CANTHYDRUS, Sharp. 

 O. bicolor, Say. 



Anglesea — Wenzel. 



HYDROOANTHUS, Say. 

 H. iricolor, Say. 



Generally distributed, rather common — Liebeck. Newark. 

 New Jersey — Collection United States National Museum. 



LACCOPHILUS, Leach. 

 L. maculosus, Germ. 



Generally distributed, moderately abundant — Liebeck. Cald- 

 well, common — Crane. Newark. Madison. New Jersey — 

 Collection Roberts and United States National Museum. 



L. proximus, Say. 



New Jersey — Collection United States National Museum. 



L. fasciatvis, Aub6. 



Generally distributed, moderately abundant — Liebeck. New 

 Jersey — Collection Roberts and United States National Museum. 



L. undatus, Aube. 



New Jersey — Collection Roberts and United States National 

 Museum. 



HYDROVATUS, Mots. 

 H. cuspidatus, Germ. 



Camden, rare — Liebeck. 



H. pustulatus, Melsh. 



New Jersey — Collection Roberts and United States National 

 Museum. 



DBSMOPACHRIA, Bab. 

 D. convexa, Aub6. 



Camden, rare — Liebeck. New Jersey — Collection Roberts. 



