Abstract
In a former paper I have described the anatomy of the nervous system of the Sphinx ligustri, Linn ., and the changes it undergoes during the larva and the earlier stages of the pupa states. In the paper which I now have the honour of laying before the Society, these changes will be followed through the remaining stages, until the insect has arrived at its full development, and I shall endeavour to show the manner in which they are effected.