In another group of Diptera, the blood-sucking parasites of the hippoboscidae and allied families, the whole larval development is passed through within the mother's body, and a full-grown larva is born the cuticle of which hardens and darkens immediately to form a puparium; hence these flies are often called, though incorrectly, Pupipara.
"The Life-Story of Insects"
Geo. H. Carpenter