‘deo NATURAL HISTORY. 
in the mouth. But thefe infects differ from each other in their coloti?y 
which perhaps is owing to the quality of the juice of the trees and 
plants by which they are nourifhed: thofe that feed upon pot herbs 
and plumb trees, are of an ath colour, only they are greenifh when 
they are young: thofe that belong to the alder and cherry tree, are 
black, as alfo thofe upon beans, and fome other herbs: thofe on the 
leaves of apples and rofe trees, are white; but as they leap like Grafs- 
hoppers, they are not properly placed among the Pucerons: the moft 
uncommon colour is reddifh; and Pucerons of this fort, may be found 
on the leaves of tanfey, and their juice, when rubbed in the handsy 
tinges them with no difagreeable red: this may furnifh a hint to the 
more fkilful phyficians, and botanifts, for a farther examination; for 
it is very certain, that obfervations of this kind, may point out the 
way to ufeful difcoveries. 
The three principal and conftant enemies to thefe infects, are firft a 
a fort of Flie, whofe fhape may be known from moft authors, who 
have given an account of infe€ts, and fome have taken notice of their 
changes; however there is in none a very exact defcription of their 
nature: this Flie lays its eggs upon the leaves where the Pucerons are 
‘in the greateft number; there is generally only one at a time, which 
produces a worm, which with its tharp mouth, feizes upon the Puce- 
rons that lye next it, and holding them up, fuck their bellies, and af- 
terwards devours them: the next enemy is a fort of worm, which 
though taken notice of by authors, has not been fully defcribed ; this 
devours the Puceron, not only while it continues to be a worm that has 
an oblong brown body, marked with red fpots, and fix creeping feety 
but after it is turned to a {mall roundifh Beetle, of no unpleafant colour, 
there are a great number of this fort, which differ in the colour, and 
' the fituation, and the number of the fpots upon the wings: the third 
"enemy is the Ichneumon Wafp, which is of a fmall fize: this gets into 
the middle of the Pucerens, and with its horns feek for one of the 
plumpeft of the females, and lays an egg upon her; from which a worm 
proceeds, that enters into the body of the Puceron through a pore: this 
done, the Puceron feems to adhere more ftrongly to the leaf with its 
elaws, and fo continues till the worm grows within its body, confumes 
all the juice, and fo kills it: the colour of the fkin is then changed into 
the whitenefs of a pearl, to the fhape of which the {welling body is not 
unlike; it then becomes harder, and defends the ichneumon worm 
againft the injuries of the Ant. After feven days, the worm begins 
to creep; and this generation is performed twice every year. 
The other kinds of Podura are, 1. That with feelers, confifting of 
numerous joints. 2. The fhort horned Podura. 3. The round bodi- 
ed bright Podura. 4. ‘Phe long bodied larger Podura. 5. The downy 
Podura. 6. The long legged Podura. 7. The lead colour Podura. 
8. The fmall black legged Podura. 9. The very fmall white Podura. 
yo. The fhort bodied blue Podura. 11. The dufky greyifh Podura- 
1z. The fhort tailed Podura. 13, The fpreading tailed Podura- 
34. The large headed Podura. 15. The long Podura with flender 
legs. 16. The flender horned Podura. 17. The larger water Podu- 
ra. 18. The long bodied blueifh water Podura. 19. ‘The fubterra- 
nean Podura. Part of thefe are to be met with on the branches of va- 
zious bufhes and plants, and the other part in ditches and ponds. 
: CHAP.’ 
