78 Mn. Manxwicr’ s Account m the Mufca Pumilionis 
what time the egg of the caterpillar was introduced into the field. 
It was imagined it might have been carried on in the manure; but 
the only manure applied to this field was lime, and I do not under- - 
ftand that to be the receptaculum of any of the genus of mufca. 
The kind of wheat fown was a white wheat, lately introduced here 
from Surry : my friend could not recolleét with certainty its name, 
but thought it was called white Zealand wheat. None but what 
was fown early, about the latter end of September, or the beginning 
of October, was affected by this infeét ; and in one field, where a 
part of it was early fown with white, and the other with red wheat. 
-atthe fame time, the white wheat was much affected, and the red but 
very-little. The reafon why the early-fown wheat only was affect- 
ed is, I fhould imagine, becaufe the cold at the approach of winter 
deftroyed the fly before the late-fown wheat was fprung out of the 
ground : confequently it could not lay its egg in that. 
The foil is rather ftiff with a gravelly bottom. I fhall be very glad 
to meet with the obfervations of fome other of our fcientific friends. 
I can fearcely flatter myfelf that our inveftigation of this infe& will 
be productive of fo much benefit to the public, as to find out a re- 
medy for the evil by deftroying it effectually ; but it is with fome 
fuch view that I trouble the Society with thefe obfervations. 
] have made as accurate a drawing as I was able of the infect in 
all its ftages of growth, and the fituation in which it is found in the 
principal fhoot or ftem of the plant. 
CATSFIELD, 
Aug. 29, 1791. 
EXPLANATION of TAB, rz. 
a. The caterpillar of its natural fize, as it is found in the centre 
of the green wheat juft above the root. | 
b. The pupa in the ftem. 
c. The pupa of its natural fize. C. the fame magnified, 
d. The fy of its natural fize. D. the fame magnified. 
E. The wing magnified. 
IN 
