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| VIII. A new. Arrangement of Papilios, in a Letter ta the Profident, By 
Mr, William Jones; F. L. S. 
Read Yuly 5$, 1791: : 
Dear + side 
AY I prefume to offer to the confideration of the gexticitien of 
: the Linnean Society fome remarks upon Linnzus’s divifion of 
the genus of Papilio, and to point out obvious diftinétions by which 
they may be claffed with :more certainty? From the fhape of the 
wings, a’ principal charaétér with Linnzus, though various, yet in 
that variety fo gradually approáching each other, I find it impoffible' 
to draw the diftinguifhing line: I therefore apply to anatomy for 
fuch charaéters as may with certainty diftinguifh each family from 
the others. The fpecimens that had been infpeéted by that great 
obferver of nature were few in proportion to thofe fince known; it 
was difficult therefore to afcertain, with the precifion neceffary, 
thofe diftinétions that a further and more extenfive acquaintance 
with a far greater number afforded ; and yet, though his charaéters ` 
. were not: fufficiently marked, they have gone far to lay a founda- 
tion for a more correct divifion ; and that, fo far from raifing new 
difficulties, I think points out the very fcheme.more clearly which 
Linnzus himfelf had adopted, and would have further elucidated, 
had. he feet more on the fame fubjeét ; for it may be prefumed he 
was: acquainted: with very few miord:than he had in his laft edition 
: of his Sytema defcribed, only 274 Papilios; an inconfiderable num- 
aoa | | : ber 
