Delicate flies and Microlepidoptera, which it will not do to fasten with mucilage, may first be mounted on the fine pins described above and these thrust into oblong or triangular bits of pith or cork, which are mounted on larger pins as shown in Figures 101 and 102. This affords a very satisfactory method of mounting, particularly as the different sexes may be brought together on the same bit of pith, or the adult and puparium in Diptera, as shown at Figure 101. Strips of stout cardboard with the pins run through the narrow edge may also be used. The method of mounting minute Hymenoptera and Diptera and other insects on a bent wire, mentioned above, is illustrated at Figure 94. This method has not proved so satisfactory, as the wires are apt to become loose on the pin. [Illustration: FIG. 102.--Microlepidoptera mounted on pith (original).] [Illustration: FIG. 103.--Method of mounting duplicates (original).] _Mounting Duplicates._--If the collector finds more specimens of a rare species than he cares to have in his collection, the excess may be mounted as duplicates. If the species happens to be of a large size the specimens are pinned in the ordinary way, but if small enough to be gummed, there is a most convenient method of rapidly mounting the specimens so that they may be sent through the mail with much less risk of getting broken or knocked off than if glued on paper points, and will also take up very little room in the duplicate boxes. It consists in gluing the specimens in a transverse row on a strip of white card paper with one of the glues soluble in water, care being taken that between the individual specimens some space be left, and further that the heads and antennae do not project beyond the edge of the paper. The width of the paper strip must be somewhat greater than the length of the specimen, so that below the latter there is sufficient room for inserting a pin through the paper. After the glue has become dry the row of specimens is cut with scissors into several smaller rows of convenient size, so that on each of these rows there are two or three or more specimens, according to the size of the species. A locality label is pushed high up on a No. 3 or No. 4 pin, and one of the mounted rows of specimens is then pinned and pushed up near the locality label; a second row is then pinned and pushed near the first row, and the same process continued with the third row and so on. A single pin will thus bear five or six rows, and in giving away or sending away specimens the lowest row is taken from the pin and repinned for mailing. The accompanying figure (Fig. 103) illustrates the mounting of a moderate-sized species in rows of two specimens each. This method of mounting duplicates may be adopted not only for Coleoptera, but also for Heteroptera, Homoptera (excepting Aphididae and allied families), smaller Orthoptera, and Hymenoptera. It is, however, impracticable for Lepidoptera, Diptera, and most Neuroptera.