The midge larva commonly called bloodworm is most easily imitated by simply lashing a length of extra-small vernille to a hook, usually a curved scud-style hook, leaving a length projecting at both ends. I usually melt the ends to create a little taper (and fuse the material). Bloodworms occur in a variety of colors ranging from claret and red to tan and cream and don't have a lot of distinguishing features; they are slightly segmented and have an inconspicuous head and legs.