THE BOAT-FLY. 427 



Genus VI. — '^he Notone&a, or Boat fy. 



The flies of this genus have the roftrum be'it in towards 



the thorax, the antennae very (hort, and the four wings 



crolTed 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- 



neftae. 



The firll is of a pale colour, mixed with black, and is 



very common upon llagnated water f ; the head is round, 



and for the greateft part occupied by two large browa 



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 crofled one over the 



other. 



The fecond fpecies alfo frequents the water, is much 

 fmaller than the former, and emits a difagreeable odour. 

 The elytra are pale, llriated with a number of undulating 

 tranfverfe lines J. Its fhape is oblong; the forehead and 

 feet of a golden yellow ; the thorax brown. 



The fmall notone£la is of a fize fcarcely perceptible ; 

 and, according to the Sxvedijh naturalift, has neither 

 wings nor elytra. The whole infe£l; does not appear 

 larger than a fmall grain of fand, and is of a brov/n co- 

 lour, tranfverfely llriated §. 



3 H 2 The 



* Regne Ammale.p. 100. + Vide Petivert, Gaz.t. 74, 



I Fauna Swecica, Ord. II. Gen. 3. § Regnc AnJmale, p. 103, 



