23 ° 
NATURAL HISTORY. 
Genus . 11. , j 
EPHEMERA. 
CbaraSler. . 
^ J[^ HE mouth has neither teeth nor fpiral 
tongue. The wings are ereft, and the hind, 
er fliorteft. The tail is fiirniflied with hairs, 
or briflles. The horns are fliort and brift- 
ly- 
E P H E M E R A.— The DAY-FLY. 
^ HESE flies derive their name fronT the 
fliort period of their exiftence. Some of 
their different fpecies live feveral days ; 
while others, that take their firfl flight at the 
fun, die before that luminary rifes again. 
Some have only the life of an hour; others 
exifl but half an hour. 
'1 he ephemerae, before they fly, have 
been in lome manner flflies; and, what is 
very remarkable, they have been obferveJ 
to remain as long as one, two, and three 
years, in their larva and chryfalid flates. 
Both the larva and chry falls have fmall 
fringes of hair on each fide ; which, when 
moved in th.e water, ferve them as tins. 
'I’he 
