THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER. 
183 
(Insekten) the number of faults and 
errors is considerably below the usual 
per-eentage.” — (Stettin Ent. Zeit. 1861, 
p. 110.) 
On the Influence on Entomology 
OF THE EUROPEAN PLANTS INTRO- 
DUCED into North America. 
BY BARON OSXEN SACKEN. 
(IV unslated from the ( Stettin Entoin. Zeitung 
1861, p, 53). 
It is well known that during the coloni- 
zation of North America a multitude of 
European plants were introduced there. 
The dissemination of these incomers 
still progresses, and many old persons 
can trace perceptible changes in the 
Flora of their neighbourhoods, caused by 
the decrease of the indigenous plants 
and the increase of those imported from 
Europe. Asa Fitch observed, quite cor- 
rectly, in an address to the New York 
Agricultural Society, that these foreigners 
have a great advantage over the indi- 
genous plants, especially from being 
nearly free from the attacks of insects, or 
entirely so; thus he observes that Linaria 
vulgaris in Europe nourishes several 
kinds of larvae, but not one in America, 
nor is it attacked by any insect. This is 
the cause of the great prevalence of such 
plants. Certainly there are European 
plants which may find near relatives in 
America, and therefore may probably 
serve as food to the same species of 
insects. But with many foreign plants 
this is not the case; they bring no new 
insects over with them, but drive away 
the American plants, with the insects 
which live on them. 
For instance, with the American Com- 
posite, which, in densely populated dis- 
tricts, have already become perceptibly 
scarcer ( Solidago excepted, which still 
prevails everywhere), the Trypetce that 
live thereon must also vanish. In this 
way the Fauna will in time undergo a 
gradual change. But whether Linaria 
and other plants at present unattacked 
by the American insects, will continue 
for ever free from paying tribute to our 
Fauna is an interesting problem, which 
possibly will only be solved at a distant 
futurity. 
To Oologists. 
R. J. C. STEVENS begs to 
announce that he has received 
instructions to Sell by Auction, at his 
Great Room, 38, King Street, Covent 
Garden, on Friday, March 15, at half- 
past 12 o’clock precisely, the Valuable 
and Authentic COLLECTION of 
BRITISH BIRDS’ EGGS, formed by 
Mr. Wheelwright; the whole of those 
from Norway and Sweden have been 
collected by himself, and amongst other 
rarities may be named the Nest and 
Eggs of the Nutcracker, also a few 
Birds’ Skins. 
On view the day before, and Cata- 
logues ready ten days before the Sale, 
and may be had on application. 
S YNONYMIC LTST of BRITISH 
LEPIDOPTERA, for interchange 
amongst Collectors. Part II. is now 
ready. Price Is. 6d. per dozen (post 
free). 
SYNONYMIC LISTS to the end of 
the Nocture may still be had on applica- 
tion. Price Is. 3d. per dozen, or 4s. 6d. 
for 50 (post free). 
H. T. Stain ton. 
Mountsfield, Lewisham, S.E. 
Price 3s. 6d., 
T he world of insects-, 
A Guide to its Wonders. By 
J. W. Douglas, President of the Ento- 
mological Society of London. 
London: John Van Voorst, 1, Pater- 
noster Row. 
