The Influence of Temperature and Humidity on the Pupation ofXenopsylla cheopis

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Abstract
1. The conditions of temperature and humidity under whichXenopsylla cheopisis able to complete its metamorphosis are described.2. The larvae and pre-pupae are easily killed by drying, but the pupae are not. The cocoon does not protect the larva from drying.3. Development is much quicker at high than at low temperatures.4. The rate of loss of water from the larva appears to be proportional to the saturation deficiency of the air, at any rate at 18°C., 22°C. and 29°C.—when the time which elapses between spinning the cocoon and the formation of the pupa is taken into account.The writer is indebted to Dr. P. A. Buxton for reading and criticising the manuscript.