CORRESPONDENCE

J. F. Hansen
1886 Canadian Entomologist  
If a specimen becomes oily, it is generally believed that its beauty can never again be restored; but with a trifling cost and a little labor, any specimen will in a short time have again its former lustre, rvithout injury to the insect. This remedy has been tried on the most tender Diurnals, as well as on Sphinges and Noctuids; it can be used on every insect. Shouid a specimen be oily throughout, body and wings, it may be put in the following fluid : One part of sulphuric ether to two parts of
more » ... her to two parts of the strongest alcohol, and left therein for about z4 hours. Should the specimen be very oily, another bath may have to be applied. Should this second bath, after removing the insect, be only slightly discolored, the insect may be put in the last bath, which consists of pure sulphuric ether, in which it is left a ferv hours only. After being taken out and partly dried, it is put on the spreading board' Another wav of cleaning specimens, where only the lvings are oily, is this : The specimen is put on the spreading board, under side up, rvithout fastening it in any way, and the purest spirits of turpentine poured on it to fully soak the rvings, after which fineiy-powdered pipe clay is stre'lvn thickly over the affected parts, and this left to dry. Should the clay, after being dry, be yellow, the oil is not all out of the wings, and the above has to be renewed. Should the clay be perfectly white after drying, it can be relied upon that every particle of the fatty matter is drawn out of the wings. To remove the clay it needs a little experience, though any one can do it with a little care. Hold your specimel on the upper part of the pin, and give the pin a little jerk near the point, and the clay, being brittle, rvill easily fail off. After it is all removed, the specimen may be brushed off with a fine camel hair brush until clean. A specimen treated in the above ways will never again become oily. CORRESPONDENCE. Dear sir; whilst out for an entomological ramble at Lachine on Nov. rrth last, I took a fine specimen of Dicerca obscura Fab. at the foot of a tree, but rvhether the tree was an oak or a maple I unfortunately did not at the time note. Now this is very interesting, as it seems to indicate that this species, too, is double-brooded. I have read of .some of the
doi:10.4039/ent1878b-4 fatcat:4z6cgeftavdhdkvb6bciwqvfje