S PLALE LXXV. 
This fpecies 3 is by far the moft common of the. ‘Notoneéta ; genus 
in England. It is an aquatic Infe&y undergoes its feveral changes in 
the water, and in the laft {tate is furnifhed with wings for flight. 
In the day-time it may. se obfeiwad-s on the furface e ftill waters 3 
it always fwims on its back, with its leys extended. In the evenings 
it fies in the air. Found during moft of the fummer months. Moft 
authors have defcribed the upper fhells as being of a brown colour, 
variegated with clouds of black ; but this appearance is not conftant in 
every fpecimen; they lofe much of that colour after being taken out 
_of the water, or if the wings are expanded. . 
re. | ee 
