THE BOAT-FLY. 
427 
Genus VI . — 'the NotoneBa , or Boat fiy . 
X he flies of this genus have the roftrum bent in towards 
the thorax, the antennae very ftiort, and the four wings 
eroded over each other *. The fix feet are all formed 
for fwimming } and the abdomen is terminated by four 
horny appendices. This tribe comprehends in it only 
three fpecies ; the grey, the ftriated, and the fmall noto- 
neftse. 
The firfl is of a pale colour, mixed witli black, and is 
Very common upon ftagnated water f ; the head is round, 
and for the greateft part occupied by two large brown 
eyes ; the antennae are very fmall, of a yellow colour, 
and inferted in the under part of the head ; the elytra are 
of a rufty cloudy colour, large, and eroded one over the 
other. 
The fecond fpecies alfo frequents the water, is much 
Smaller than the former, and emits a difagreeable odour. 
The elytra are pale, ltriated with a number of undulating 
tranfverfe lines J. Its lhape is oblong ; the forehead and 
feet of a golden yellow ; the thorax brown. 
The fmall notonccla is of a fize fcarcely perceptible ; 
and, according to the Swedifh naturalift, has neither 
tvings nor elytra. The whole infect does not appear 
larger than a fmall gram of fand, and is of a brown co- 
lour, tranfverfely ftriated §. 
3 H 2 The 
* Regne ‘tni'nale, p. IGO. f Vide Petivert, Gaz.t. 7a. 
I Fauna Swecica, Ord. it. Gen. 3. § Rcgne Animate, p. 102. 
