Mn. Cortis’s Olfervations, Cic. 87 
Salix viminalis, which had been planted in my garden two years, and 
which was now about fix inches in diameter, throwing out from 
various parts of its trunk a fubftance fomewhat refembling faw- 
duft, which fell at its bafe in no inconfiderable quantity. This fub- 
ftance, on a clofer examination, was found to proceed from holes 
about the fize of a goofe quill, penetrating deeply into the fub- 
ftance of the wood, obliquely upwards and downwards. On its firft 
coming out it appeared of the colour of the wood, and was moift; 
as it grew dry it became of a browner colour. The whole of the 
trunk where this internal operation was going forward emitted a 
fmell fomewhat like beer in a ftate of fermentation; and various 
_infeéts allured thereby fettled on the tree, and feemed eagerly to 
imbibe nourifhment from it: among others the Papilio Atalanta, 
Scarabæus auratus, Apis mellifera, Cantharis livida, with various fi pecies 
of Muftæ, were frequent attendants. On the tenth of June I 
took the Cerambyx mofchatus on the trunk, but faw only one. 
Thefe extraordinary appearances ftrongly excited my curiofity ; 
I therefore often vifited the tree, and, on minutely examining its 
bark, I difcovered feveral fmall coleopterous infeéts in its crevices, 
which at firft, from their great fimilitude, I miftook for the Cimex 
 h&üularius: a more clofe infpe&ion, however, foon convinced me 
that it was a Sipha; and on turning to the Syfema Nature of Lin- 
neus, I had little doubt but it was his Sipha grifea. On examining 
the faw-duft-like fubftance in its moift and fermenting ftate, I E 
covered many fmall larve feeding amongft it, which when fully 
grown were about a barley-corn in length ; the body fomewhat 
flattened, of a dirty white colour, having fix fore feet and two 
hind ones; the head of a brightifh brown colour, furnifhed with 
two jaws ; each joint of the body projecting at the fides, fo as to give 
it a kind of ferrated appearance; the neck of a blackifh brown 
colour, with two or more rows of {mall dots running therefrom 
down 
