There is provided an apparatus for sorting arthropod larvae and pupae and in particular, although not necessarily, to sorting arthropod pupae on the basis of size, especially in mosquitoes. The apparatus can contain two parallel bars pivotally mounted in a frame such that the distance between the bars is adjustable. Insect larvae and pupae may be inserted into a chamber with one side formed by the grid of bars and inserted into water to separate the different forms.
