The Hiftory ^/ANIMALS. 
3i 
OEJlrus niger thorace flavo. % fftftp Jflp, 0? 
The blackijh OEJlrus, wVA ^ yellow breafi. ttUMptt Jfi|?. 
This is a very large fly, confiderably exceeding the common blue fly in bignefs : 
the body is of a dufky grey colour, approaching to black, and is fmooth, except about 
the thorax, where there are a great number of yellow, long hairs: the wings are large 
and pellucid; the body is oblong, and the eyes are large and black : the female depofits 
her eggs in the noftrils of fheep, deer, and fome other animals ; and the worms pro¬ 
duced of them live either there, or in the frontal Anus of the animal, to the time of 
their maturity. Authors call it, OEftrunp rhangiferinum Laponicum, and OEftrum 
flnus frontis ruminantium. We call it the grey fly from it’s colour, or the trumpet 
fly from the noife it makes in the heats of fummer, attended to by Milton in his 
> 
What time the grey fly winds her fultry horn . 
It is frequent about our hedges in autumn. 
The other fpecies of the OEftrus are, j. The larger, bee-like OEftrus. 2. The 
fmaller, round-bodied OEftrus. 3. The Targe, black and yellow-bodied OEftrus. 
4. The black-legged, clear-winged, black and yellow OEftrus. 5. The fhort- 
winged, long-bodied OEftrus j the worm of this lives in the inteftines of horfes. 6. 
The large, rounder-bodied, plain-winged OEftrus; the worm of this lives under wa¬ 
ter, and is called Tabanus aquaticus, and Chamasleo. 7. The fmaller, oblong, and 
pointed-bodied OEftrus. 8. The variegated-bodied, {hort-legged, fpotted-winged 
OEftrus. 9. The black and tawny OEftrus. 
A 3 I L U S. 
T HE head is furnifhed, by way of mouth, with a Input of a fubulated flgure, 
which is Ample, and very {harp at the extremity. 
Afilus ferrugineus abdomine partim flavo, partim nigro . 
The ferrugineous Afilus, with the body part black, part y ellow . 
This is one of the largeft of the fly kind ; it equals the hornet in Aze, and has fo 
great an external refemblance to it, that they are eaflly miftaken for one another : 
the head is large j the fnout long and black ; the eyes very prominent: the thorax is 
very large and gibbous, and is of a duiky colour : the wings, the legs, and the belly, 
are all of a ferrugineous colour: the body, on it’s upper part, is black and yellow; it 
con A ft s of feven articulations; the three upper ones of which are black, and the four 
others yellow. ..y ; ’ ‘ . r ', 
It is frequent in our paftures in autumn j it generally flies low. Authors call it 
Mufca crabroniformis, and Mufca rapax major. 
Afilus niger hirfutus abdominis tribus extremis articulis albis . 
The great, black and white-bodied Afilus . 
This is larger than the former fpecies, and even exceeds the hornet in bignefs. 
The body is long and {lender 5 the wings are large and greyith : it is all over hairy 
and black, except that the front of the head is pale, and the three laft rings of the 
body are white 5 and, in the male, the belly is fomewhat yellowifti. 
This is a fcarce fly ; I met with it laft year in the Fens in the ifle of Ely. 
Afilus vefpaef irmis antennis capite longioribus. 
The vjpceform Afilus, with the ant entice longer than 
the head\ 
This is of the Aze of the common Wafp, and very much refembles it in fhape and 
co our : the head is fmooth and yellowifti j the body is obtufe, and all it’s joints are 
edged with a pale yellow. 
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