The flies are remarkable for their remarkable powers of leaping.
Family 3, Simuliidæ.—This family includes only one genus, Simulium.
It is, however, widely distributed, and some of the species, which are popularly called Sand Flies, are exceedingly annoying in hot climates.
Fig. 125.—Simulium Ornatum (Mag.)
Family 4, Bibionidæ.—Several species belonging to this group are very familiar insects. Among them is the St. Mark's Fly (Bibio Marci), which is black, with transparent wings in the male and brownish in the female.
These flies appear in the spring, and their larvæ live in dung or damp earth.
Many of the species are popularly called "garden flies."
Fig. 126.—Bibio Hortulanus (Mag.)