SCARLET HYDRACHNA. 
Generic Character. 
Head, thorax, and abdomen united. 
Feelers two, jointed. 
Eyes two, four, or fix. 
Legs eight. 
Specific Character, &e. 
Subglobofe fear let HYDRACHNA, marked above 
with diftant impreffed points. 
Scarlet HYDRACHNA, or red water-fpider. 
The genus Hydrachna, inftituted by Miiller, feems 
to form as it were a link of connexion between the 
genera of Acarus and Aranea. Thefe animals are 
commonly known by the name of water-fpiders, 
and are feldom of any confiderable fize. The pre- 
fent fpecies, which is fhewn as it appears when mag¬ 
nified, is perhaps the mod remarkable of the Britifh 
fpecies, and is not uncommon in clear ftagnant wa¬ 
ters in the fummer months. It grows to the length 
of about the fifth part of an inch. 
