While the family Notonectidae is considered cosmopolitan throughout North A
merica, no published records exist for its presence in two of the United St
ates: Delaware and New Hampshire. We newly report this family for Delaware.
It is represented by seven species in two genera; Buenoa margaritacea, B.
scimitra, Notonecta insulata, N. irrorata, N. raleighi lunata, N. uhleri an
d N. undulata. A list of additional species likely to occur in Delaware is
also provided.