120 THE CANADIAN ENTOMOLOGIST. 
will be about fifteen days, and allowing four days for duration.of the egg, 
we may conclude that this is deposited from 1st to 15th of July. There- 
fore, an effort should be made to take the females the last of June or first 
of July; and when taken, they should be enclosed in a gauze bag, on a 
stem of Hop, or on Nettle, Elm, and perhaps Currant or Wild Goose- 
berry; or enclosed in a keg, if convenient (nail or powder keg), from 
which the heads have been removed, and the upper end covered with a 
cloth, held down by one of the hoops. Care should be taken to stop up 
all holes next the ground by which the insect would escape. In this way 
eggs will infallibly be had, if the insect is confined with the food plant of 
the larva. In the present case, as that is not certainly known, if after 
24 hours no eggs are found to be deposited, I should try one of the other 
plants named. If eggs are obtained, two or three should be placed in a 
small vial of water, to which has been added a few drops of carbolic acid 
solution, which preserves them effectually, and should be sent by mail ta 
Miss Mary Peart, Pauling, Chester Co., Pennsylvania, for drawings 
for me. In the same way, the larvæ at different stages may be sent, in tin 
or wooden (not paper) boxes, by mail, with a supply of the food plant, 
advising by letter of such sending. The chrysalis may be sent in the 
same way as soon as formed. It is desirable that as full notes as possible 
should be taken cf the changes of the larvæ. These I will publish, as 
well as the drawings, in Vol. II of But. N. A., with credit to the discoverer 
and observer. 
In the same way, it is desirable that the larva of G. gracilis should be 
found, and I will give a similar reward for the discovery of the preparatory 
stages of this species, if attention is given to my directions in forwarding 
the eggs, larvæ and chrysalids for drawings.—Wu. H. Epwarps, Coal- 
burgh, West Va., May 24th, 1873. 
ADVERTISEMENTS. 
EXCHANGE.—I am desirous to exchange English for Canadian or 
American Lepidoptera. J. C. WASSERMAN, Beverly Terrace, Cullercoats, 
North Shields, England. 
COLEOPTERA FOR SALE.—A number of Rocky Mountain Coleoptera 
will soon be for sale in sets by JoHN AKHURST, 19, Prospect Street, 
Brooklyn, N.Y. 
