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placed on insulated and hastily-observed facts like the above, and 
that it is highly probable that M. Audouin’s opposite theory, being 
built upon a far more accurate and close observation, is the true 
one ; but as unfortunately the letter with which he favoured me, 
though adverting at considerable length to other points, does not 
enter into any details as to this, I have thought it best in this hasty 
scrawl (of course not at all meant for publication) to state my pre- 
sent impressions, as the clearest way of directing the attention of 
the members of the Society, who may have inclination and oppor- 
tunities (probably more favourable than mine) to pursue the inves- 
tigation, to the precise points which seem to require examination, 
and may most directly lead to ascertaining the true state of the 
case. 
“ In concluding this subject it may not be superfluous to add, 
that I have reason to believe that successive broods of Scolyti are 
disclosed in the perfect state from May to August, and that the 
females may be found engaged in the operations of forming their 
galleries during the whole of this period. I also beg to express 
my hope that such of the members as have the opportunity, will 
endeavour to ascertain whether, in the case of other wood-boring 
genera, as Hylesinus, Tomicus, & c. the same preliminary attacks 
for food only are made on sound ash and fir-trees, &c. so as to 
prepare them for being attacked by the females, as take place in 
elms. 
“ 1 enclose in a small box three species of insects for the So- 
ciety’s cabinet. 
“ 1st. Specimens of the most common kind of house-fly at 
Newhaven, Connecticut, U.S. Sent me by Mr. Herrick. 
“ 2d. A minute dipterous species [of the genus Ceratopogon ] 
w ith its pupa case, which I have bred from the larva which 
feeds on the sap flowing into the ulcers in elms, (see the 
extract from the Arboretum Brilannicum, p. 1, line 5 from 
top), in which I always found them abundant in France, 
and probably they are equally so in England. If, as is 
most likely, this insect be described, I shall be glad to 
learn its name; and if undescribed, I hope some member 
of the Society who studies Diptera will describe it. 
“ 3d. One of the Bostrichidce, Fab., Gyll. 3. 358. nec Oliv., 6- 
dentatus, Oliv., which I take to be Tomicus chalco- 
graphus. This has doubtless been found in England, 
