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].
ll. Last antennal segment clavate or fusiform; win membrane with the veins often forked and anastomosing; scutellum large; tarsi each with two segments; fore legs strong. (= Phymatidæ) Macrocephalidæ