78 
THE SUBSTITUTE. 
bcve we find ilie cocoon of Erio- 
fjnster lunestris on thorns and vose- 
siems around old pits. The larva 
of Lnxiocarnpa Quercus should be 
now about an inch lon«;, and may 
be found dormant amonpjst dead 
leaves. L. Trifolii is still in the 
these hatch in February and 
March. L. Rubi is hybernatin<r, 
curled up in a cavitv in the earth, 
or in dead leaves. G. liicifolia is 
new in pupa, in a white silken co- 
coon. — C. S. Gregson. 
I have on several occasions 
seen larva; which had issued from 
a case of Fwnea nilidella, in 
which, as is well known, the fe- 
male deposits her eprgs. There is 
every reason to believe that these 
egrjrs were unimpregnated, because 
] found the cases directly after 
they were spun up, and long be- 
fore the imago appeared. I am 
tolerably sure that I have had 
larva? from cases which the larva? 
were carrying about when I found 
them at Black Park, and to which 
cases no male imago had access ; 
but I cannot find the memoran- 
dum I made at the time, and .so 
will not be positive. — J. W. 
Douglas, Lee\ November 22, 
1 85(b 
Sirex gigns . — On the 23rd of 
August, i855, I took, for the first 
time, Sirex gigas : it was in com- 
pany with a number of wasps, and 
apparently eating a pear when I 
first molested it; it flew rapidly 
away to another part of the garden 
I was in. When captured it used 
iis ovipositor like the Ichneumo- 
nidre. — John D. Head, Sideot 
School, near Weston-super-Mare, 
Somerset; November 10, 1850. 
Announeiment of Duplicates . — 
In No. 1 of your valuable periodi- 
cal you gave us a very cajdtal 
article on the exchange of dupli- 
cates ; but I am sorry to .say that 
part of it which related to the 
“quid pro guo” system has been 
entirely overlooked Ity most of your 
numerous readers, for I have my- 
self written an immense number 
of epistles begging specimens, and 
yet I have not in any one single 
instance received an answer to 
those letters which did not con- 
tain an offer to exchange; and 
having exhausted my stock I am 
now unable to obtain any deside- 
rata. Now, Mr. Editor, this state 
of things will never do; it is a 
disgrace to the entomologists of 
Great Britain, and will, no doubt, 
do more to deter young hands 
from following this delightful 
study than any thing else. Surely 
those persons who do not intend 
to GIVE AWAY their specimens 
should say so, and not lake to 
themselves the public credit of 
being magnanimous without the 
private cost; and my object in 
asking you to let this letter appear 
is to beg that all entomologists 
w'ill, in future, state whether they 
intend or not to part with speci- 
mens without a return, in order 
that we poor novices may not 
waste our postage-stamps to no 
purpose. I coulil say a great deal 
more on this subject, but, fearing 
to encroach too much on your 
space, I shall conclude by sub- 
scribing myself — Oxe of the 
SUFFEIIERS. 
Attracting Male ItFoths, — I have 
succeeded in obtaining male moths 
by placing on the body of a tree, 
in the evening, females that have 
been unfortunate enough to emerge 
into the imago state with wings 
crum]iled and unfit for use. I 
should recommend all those who 
