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Hi G?nter
Normal practice would be to glue the puparium on a card and mount it on the pin under the specimen. Ideally the puparium would be glued on its side, so that both dorsal and ventral sides are visible. With those puparia that have a lid that pushes off, be careful to collect and glue that on as well. Often the lid contains the mouthparts of the larva - very important characters for identifying preserved larvae.