. Fig. 38. Themis , Stage IV?, 8 mm. St. 691. The fifteen specimens of this form are divisible into five stages, the oldest of which is in the last stage but one. The growth factor for these stages is about i -26 for the oldest, and increases to about 1-5 for the youngest. If this rate of growth is assumed for the unknown younger stages, and if it is assumed that the first larva is about 2-5 mm. long, there will then be three unknown stages, and the youngest of the Discovery specimens will be in stage IV. The stages may be defined as follows:

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