This family contains two species, both occurring in the United States on the common fowl. _Laminosioptes cysticola_ occurs on the skin and also bores into the subcutaneous tissue where it gives rise to a calcareous cyst. _Cytoleichus nudus_ is most commonly found in the air passages and air cells. jj. Vulva transverse. In the skin of mammals and birds. SARCOPTIDÆ k. Anal opening on the dorsum. l. Third pair of legs in the male without apical suckers. On cats and rabbits. NOTŒDRES Rail. The itch mite of the cat, N. CATI (fig. 61) has been recorded on man. ll. Third leg in the male with suckers. On bats _Prosopodectes_ Can. kk. Anal opening below. l. Pedicel of the suckers jointed; mandibles styliform and serrate near the tip. PSOROPTES Gerv. P. COMMUNIS OVIS is the cause of sheep scab. ll. Pedicel of the suckers not jointed; mandibles chelate. m. No suckers on the legs of the females; parasitic on birds, including chickens. _C. mutans_ is itch mite of chickens. _Cnemidocoptes_ Fürst. mm. Suckers at least on legs I and II; parasitic on mammals. n. Legs very short; in the male the hind pairs equal in size; body usually short. SARCOPTES Latr. S. SCABIEI is the itch mite of man (fig. 56). [Illustration: 157. Amblyomma, female. After Nuttall and Warburton.] nn. Legs more slender; in the male the third pair is much larger than the fourth; body more elongate. o. Female with suckers on the fourth pair of legs. Species do not burrow in the skin, but produce a scab similar to sheep scab. They occur in the ox, horse, sheep and goat. CHORIOPTES Gerv. C. SYMBIOTES BOVIS of the ox has been recorded a few times on man. oo. Female without suckers to the fourth legs.