NATURAL HISTORY. 131 
Moft Flies are oviparous, that is, they lay eggs; but there are fome 
that bring forth their young alive. Some herd together in companies, : 
as Bees and wafps, and others are folitary, being generally found 
fingle. As for the fpecies of every kind, they have only flight differ. 
€nces, which are not fo eflential as betwixt the kinds themfelves. 
The Breeze, or Gad-Flie, is of the fize of a common blue fleth Flie, 
and has black large eyes, with feelers that confift of a long thread like 
a briftle, and the body is yellow, only it is furrounded with a black , 
elt or ftripe; the belly is of a tawny colour, except the laft joint, ° 
Which is black. The tail is long, bending under the belly, and the 
Wings are whitifh, and have a black line, with three black {pots upon 
Sach. The female is faid to lay her eggs in the backs of cattle, under 
the fkin, where it lives in the ftate of a Maggot all the winter. 
_ The grey Flie, or Trumpet-Flie, is confiderably bigger than the com- 
Mon blue Flie, and the body is of a dufky-grey colour, approaching 
to black; it is fmooth, except about the breatt, which is befet with a 
Breat number of yellow long hairs; the wings are large and tranfpa- 
Tent, the body oblong, and the eyes Jarge and black. The female 
ays her eggs in the noftrils of Sheep, Deer, and fome other animals.. 
tis called the Trumpet: Flie, from the noife it makes in the hot days 
of fummer. : 
Linnaeus has four forts of thefe Flies, to which he gives the general 
Name of Oeftrus; namely, the Ox-Oeftrus, or Gad-Flie, the Oeftrus 
that attacks the Rein-deer, the Noftril Oeftrus, and the Hemorrhoidal 
Oeftrus. Others take notice of the larger Bee-like Oeftrus, the imall, 
€&r round-bodied Oeltrus, the large black and yellow-bodied Oeftrus, 
the black and yellow Oeftrus, with black legs and tranfparent wings, 
the long bodied Oeftrus with long wings, which is faid to proceed. 
trom a worm that is bred in the guts of horfes. The large roundiths 
bodied Oeftrus with plain wings, that is faid to proceed from a worm 
ted under water, and is called by fome the Tabanus Aquaticus. 
The fmaller oblong Oeftrus with a pointed body, the Oeltrus with fpot- 
ted wings, a variegated body, and fthort legs; the » ‘ack and tawny 
Oeftrus. Thefe fort have a flyle with a head under each wing, and 
they are noted for making cattle run about the fields as ifthey were mad. 
The Hornet-Flie is as big as a common Hornet, and is fo like it, that 
the one may be eafily taken for the other; the head is large, the fnout 
long and black, with a fharp point, and the eyes are prominent, the 
Teaft is large and bunched, and of-a dutky colour, but the wings, legs, 
8nd belly, are of an iron-grey; the body on its upper part, is black 
8nd yellow, and confifts of feven joints, the three uppermoit of which, 
are black, and the reft yellow. : 
The Wa/p Fiie is of the fize of a common Wafp, and very much re- 
fembles it in fhape and colour. The head is {mooth and yellowith, 
the body blunt, and all its joints, at the edges, are of a pale yellow, 
8nd the fnout is long, and pointed at the end. : 
The Virginian Hornet Flic is of the fize of our largeft Flies, and has 
® black head, with a filver line that runs from the fhoulders to the 
Mouth ; it has likewife large black eyes. It has a long and ftrong 
Yeapon on its mouth, and the fhoulders are of a blackifh-brown, with 
Wo filver wings. At the back Be there are feven or eight joints, of 
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