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Hello John
Rhagionidae larva can have four lobes (as in some species of former Limoniidae), but the posterior spiracles are positioned at the base of the dorsal lobes instead of in the centre part. The head capsule however is unique for Rhagio, and this type is not present in no species of former Limoniidae. The headcapule of Rhagio consists of two parts, an anterior part joint together by two thin lateral lines with the posterior part. This posterior part has a extra median extension protruded into a small lobe. In Limoniidae the headcapsule is almost completely chitinized to very much reduced, but never with a distinct anterior and posterior part.