NATURAL HISTORY, Z 6i 
feelers, in proportion to the body. It is found fluttering among the 
teeds, and in cloudy weather great fwarms of them may be {een in the air. 
lo, The Phryganea with cloudy upper wings, and feelers three times 
as long as the body. 
11. ‘Phe leaping Phryganea with feelers as long as the body, and the 
wings marked with a green and white {pot. 
12. The black Phryganea with incumbent cloudy afh-coloured wings, 
and three blunt hairs at the tail. It may be met with every where in 
the beginning of the fpring, 
13. Lhe dutky Phryganea without fpots, is found at Fablua in Sweden, 
The Ephemera is a Fle fo called, becaufe-it has been faid to live but 
2 day, which is in fome fenfe true; though there are a fort that never 
enjoy the benefit of the fun at all; for they do not come into the world _ 
till after the fun is fet, and die before its rifing: they are in general 
Very pretty flies, and might be ranked among Butterflies, on account 
of their thape and their. wings: thefe laft are fhorter and broader in 
Proportion, than thofe of the common flies, and have-a large bafe; but 
they differ from thofe of Butterilies, in not being covered with the duik 
that renders them opaque; for they are very tranfparent, and very 
thin: they have four wings, the uppermoft of which are much the lar- 
get. When this infeé is at reft, it generally lays its wings one over 
the other on the back; and the body is long, being formed of fix rings 
that are larger at the origin than near the extremity, and from this a 
tail proceeds, that is longer than all the relt of the flie, and confilts 
fometimes of three threads of an equal length, and fometimes of two 
long threads, and one hort. 
All Ephemeras were at firft worms, and then Aurelias; and under 
_ thefe forms they grow very flowly in the water ; for Swammerdam thinks ~ 
that fome of this kind continue three years under the water. Mr Reau- 
mur has knowa them that have been two years there, and many that 
have been one. But when the flies that proceed from thefe worms, 
“come to be inhabitants of the air, they all die almoft immediately, 
though Mr Reaumur aflerts, that fore flies’of this name live for feveral 
ays. 
The infe& that is to become the flie called Ephemera, has fix fealy 
legs, fixed on the corilet, which in fome of thefe kinds is double, or 
as it were, divided into two parts: the head is triangular, and a little 
latted above and below; the eyes, which are placed before, may be dil- 
tinguifhed by their largenefs and colour; they are brown in moft of 
thefe infeés, and near the bafe of each, there is a feeler on the inner 
fide; the mouth is furnithed with teethy and the body confitts of fix 
Tings ; that next the corflet is the largeft, and they grow lefs and lef 
to the end; and the laft ring is-the fhorteft, from which the three’ 
threads proceed, which are as long as the whole body. 
~ Thefe infects live in different places, for fome have fixed habitations, 
and fome wander aboat: thofe that have fixed habitations, lye in holes 
©n the furface of the earth, under the water of rivers and flow ftreams. 
One of thefe feldom leaves its hole, unlefs through neceflity, and then 
makes another: thofe that wander about, fometimes fwim, and fome- 
times creep on bodies that are under the water; fometimes they hide 
themfelves among. the rufhes, or under pieces of wood, and at other 
Umes become quiet and {ill on the fame bodies, 
; 2 Among 
