The ground and the young larvae make their way into grasshoppers, in whose bodies they pass most of their larval life.
A third form, Microfilaria diurna, is found in the larval stage in blood, but only in the daytime.
Certain that there is no int., pelagic larval form.
Some members of this order spend the winter in the adult state, others in the " larval " or " pupal " condition.
The parasitic and free-living Nematodes are connected by transitional forms which are free at one stage of their existence and parasitic at another; they may be divided into two classes those that are parasitic in the larval state but free when adult, and those that are free in the larval state but parasitic when adult.