Some changes in the flight apparatus of tsetse flies, Glossina morsitans and G. pallidipes, during maturation.

The residual dry weight of the thoracic cuticle of tsetse has been found to increase durint maturation and this finding affects the estimates of mitochondrial and contractile protein made by Bursell. The thoracic proline reserve was also found to increase during maturation, following much the same time course as that of the increases in contractile protein. The results are discussed with reference to the relevant published work on other insects.