. Fig. 26. PamiUnis D, 8 mm. St. 407. there seems to be a gap of three unknown stages between this larva of 3-8 mm. and the youngest of the Discovery specimens. Our knowledge of the development of the European forms is not so securely founded that we are entitled to assume a similar course in other genera and species, and having regard to the wide distribution and great size reached by some of them, there may well be a longer period of larval life and a greater number of stages. Consequently I have, for the purposes of this report, accepted a provisional arrangement into thirteen stages, 6-2

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