THE 
GREAT DYTISCUS. 
Generic Character. 
Antennae either fetaceous or clavato-perfoliate. 
Hind Feet formed for fwimming, villofe on the 
interior fide, and fcarce perceptibly clawed. 
Specific Character , &c. 
Cdoffy-black DYTISCUS, with perfoliate an¬ 
tennae and long thoracic fpine pointing back¬ 
wards. 
The large Black WATER-BEETLE. 
The Spiked WATER-CLOCK. 
Grew. Muf. p. 170. 
The infect here figured is the largefi: of all the 
Britifh Dytifci, and is at once diftinguifhed by its 
uniform blacknefs, and by the remarkable fpine or 
procefs proceeding from the lower part of the tho¬ 
rax ; and which, though occurring in fome exotic 
Dytifci, is found in no other Britifh fpecies. It is 
not a very uncommon animal, though far more fo 
than fome others of the genus. It is found in ponds 
and ftagnant waters; where its larva, like thofe of 
other 
