HYDATICUS MODESTUS SHARP VERSUS HYDATICUS STAGNALIS FAB. IN NORTH AMERICA (COLEOPTERA, DYTISCIDAE)
Keyword(s):
For many years I have felt reasonably certain that the North American species of Hydaticus identified as stagnalis Fab. was not that species, and I have become entirely convinced on this point since I have had the opportunity of a critical examination of a series of the true stagnalis kindly sent to me by the late Dr. Alois Zimmerman of Munich.