one side of the paper with paste and wrap it snugly around the blotter. When the paste has dried, slice the strip crossways with a razor blade and metal- edged ruler into pieces about an eighth of an inch wide. When using one of these, pass the insect pin through the blotting paper from edge to edge at one end, and the nadel bearing the insect at the other. Fig. 13 illustrates this method of mounting. a. b. c. Fig. 12. Butterfiles spread up-side-down on a flat board. a strip of paper, as illustrated. Dragon-flies, even if they are to be pinned, may be mounted in the same fashion. The pin, however, should be left in position while the insect dries. When the specimen is removed from the board, the pin may be carefully twisted loose, withdrawn, and inserted from above through the same hole. A small drop of cement at the pin hole will prevent the specimen from turning on the pin, should the hole be a trifle too large for it. Microlepidoptera, if too small to take number one pins, should be mounted upon "minuten nadeln." These extremely slender pins are too short and too delicate for easy handling, and must themselves be mounted upon a slip of cork or balsa wood which, in turn, is mounted upon an insect pin of standard size. A piece of blotting paper covered with strong onion- skin paper is equally satisfactory as a connective, and easier to produce in quantity. Cut a straight piece of white blotting paper half an inch wide and as long as is convenient. Cut a strip of strong, thin paper of the same length by an inch and a half in width. Cover Fig. 13. A method of mounting Microlepidoptera upon minuten nadeln. a. Rear view. Note collector's label below locality label. b. Top view. c. Diagram of cross section of connective, showing how the onionskin is wrapped around the blotting paper. Insects of other orders are spread by processes essentially similar to those used for Lepidoptera. The small differences necessitated by the differing structure of the creatures will become obvious as you work. It is, for example, practically impossible to make the forewing of a beetle lie flat when extended at the side. It should, therefore, be lifted into flying position and held there by supporting pins, the guide and cover strips being passed beneath it. This results in the attitude illustrated in fig. 1. In this figure note also the positions of the pins in the various types of insects. The correct method of pinning hand-bodied insects of all kinds is discussed in Leaflet Number Four.