1. Liquid food is strained through hairs and acanthae of the preoral chamber while being drawn into the cibarium by contraction of powerful cibarial dilators.

2. The chief modifications of this form are seen in the Mitraria larva of Ammochares with only the preoral band, which is much folded and which has provisional and long setae; the Atrochous larva, where the covering of cilia is uniform and not split into bands; and the polytrochous larva where there are several bands surrounding the body