l. Hemelytra with embolium; head horizontal, more or less conical; membrane with one to four veins, rarely wanting. ANTHOCORIDÆ Several species of this family affecting man have been noted, ANTHOCORIS KINGI and CONGOLENSE, from Africa and LYCTOCORIS CAMPESTRIS from various parts of the world. LYCTOCORIS FITCHII Reuter (fig. 19 j), later considered by Reuter as a variety of L. CAMPESTRIS, occurs in the United States. ll. Hemelytra without embolium. Superfamily ACANTHIOIDEA (= SALDÆ Fieber and LEPTOPODÆ Fieber) ii. Posterior coxæ rotating. j. Claws preapical; aquatic forms. GERRIDÆ and VELIADÆ jj. Claws apical. k. Prosternum without stridulatory sulcus (notch for beak). l. Tarsus with three segments; membrane with two or three longitudinal cells from which veins radiate; rarely with free longitudinal veins (Arachnocoris) or veins nearly obsolete (Arbela); clavus and corium coriaceous; ocelli rarely absent. NABIDÆ REDUVIOLUS (= CORISCUS) SUBCOLEOPTRATUS (fig. 19 g), a species belonging to this family, occurring in the United States, has been accused of biting man. This insect is flat, of a jet black color, bordered with yellow on the sides of the abdomen, and with yellowish legs. It is predaceous, feeding on other insects. ll. With other combinations of characters. HYDROMETRIDÆ, HENICOCEPHALIDÆ, NÆOGEIDÆ, MESOVELIADÆ, JOPPEICIDÆ kk. Prosternum with stridulatory sulcus (notch for beak); with three segments, short, strong. l. Antennæ filiform or sometimes more slender apically, geniculate; wing membrane with two or three large basal cells; scutellum small or moderate REDUVIIDÆ For a key to the genera and species see next page.