Of Flies'. S 3 
Thefe little infers Leeuwenhoek calls pediculus 1 , or 
loufe, who on plucking a leaf from a plumb-tree, and 
putting it into fuch a glafs tube as has been already de- 
fcribed, which he applied to his microfcope, and found 
thereon 36 black flies, and feveral hundred of thefe green, 
lice, and among them many which were but juft hatched. 
In a fliort time thefe green lice died, and from their car- 
cafe came forth a black fly. Fig. 88. reprefents the car- 
cafe of one of the green lice as it appeared before the 
microfcope. The ftiell or fxin of its back had feveral 
rows of knobs upon it; its eyes A B were like thofe of 
other flies; C D fhew its two antennae articulated and 
fet with hairs. E F G H I K fhew the legs, having at 
their extremity two hooked nails, and fhort hairs. L M 
reprefents the aperture, from whence came out the worm, 
from which the fly was produced, having firft eaten up 
all the infide of the body of the green loufe. 
Fig. 90. exhibits one of the minute black flies thus ' 
produced from a worm, which had increafed itfelf by 
deftroying its fofter parent, and then changed into a 
nymph, and at laft from that to a fly, furniftied with all 
thofe minute organs as are expreffed in the figure; 
whereof A B (hews its two eyes, C D its anterfliae, 
which afford a pleafant fight in the microfcope, its 
curious joints being finely befet with hairs. 
E F are two organs, through which it fucks its nourifli- 
ment, its long tail G H I, K L M N, its four wings 
bedecked with exceeding fine hairs and a much finer 
membrane, G O G O O O its fix feet, which were alfo 
furniftied with many joints, and thickly fet with hairs. 
The letters P Q_R exprefs the point of the nippers which 
held the fly before the microfcope, Thefe lice are alfo to 
E 3 be 
? Arc. Nat. Ep. 13-, 
