Summary: 200 ENTOMOLOGICAL NEWS
A UNIQUE COLLECTION OF TWO
RHANTUS WALLISI IN THE BODY CAVITY
OF A FEMALE DYTISCUS ALASKANUS
R.B. Aiken, F.L. Leggett
As part of a study on the reproductive biology of Dytiscus alaskanus
(J. Balfour-Browne), we collected aquatic beetles every week in floating
bottle traps (Aiken and Roughley, in press) from George Lake, Alberta
5555'N, 1 1405'W). D. alaskanus specimens were taken alive to the lab,
killed in 70% ethanol and then the abdominal cavity injected with 70%
ethanol to preserve the reproductive organs. While dissecting a female D.
alaskanus collected in early June, we discovered two specimens of
Rhantus wallisi (Hatch) in the abdominal cavity of the female D.
alaskanus. The internal organs of the D. alaskanus female were gone
except for a few muscle fibres. The female D. alaskanus was of average size
for the species (total length
= 2.56 cm).