Of the Gnat . 77 
tenances, is joined by a fliort neck to the thorax G, 
which is large, and as it were cafed with a black fhell ; 
out of its under part proceeded fix long {lender legs H H, 
&c. much like thofe of other flies, but longer and 
flenderer, which are not expreffed in the figure, becaufe 
of their great length. From the upper part proceeds two 
long flender tranfparent wings, fhaped fomewhat like 
thofe of a fly ; underneath which, as is obfervable in 
many forts of flies, are placed two fmall bodies, which 
are its ballances or poifes. Its belly large, and extended 
into nine partitions, each being armed with rings of 
fhells; fix of which were fo tranfparent, that the periffal- 
tic motion was plainly vifible. A fmall clear white part 
at I, feemed to beat like the heart of a larger animal ; 
the three laft divifions of the tail were covered with 
opake {hells* 
Of the great bellyed or female gnat. 
A lthough this gnat, as reprefented in fig. 131, 
differs from the former in fhape, yet this fort alfo 
has been found to be generated out of the water infedt 
before defcribed : its wings were larger than thofe of the 
other; its belly bigger and {horter; its thorax not much 
unlike that of the other, having a ftrong rigid back piece 
and breaft plate; its head larger and neater fhaped ; the 
horns, that grew out of thofe- two little balls, which 
were between its eyes, was of a different fhape from the 
tufts of the other gnat; thefe having but a few knots or 
joints and a few fhort briftles ; the foremoft horns or 
feelers like thofe of the former. 
In different fpecies of gnats their wings are alfo dif¬ 
ferent , fome having a border of long feathers, others of 
{hu/t 
