ff. Antenna inserted on top of the head between margins, close to the eyes; antenniferous tubercles not projecting from the side of the head. g. Anterior lobe of the pronotum with a bispinous or bituberculate disc; femora unarmed. _S. arizonica_, _S. bicolor_. Southwestern species. _Spiniger_ Burm. gg. Disc of pronotum unarmed; apex of scutellum produced into a spine; ocelli close to the eyes; eyes large and close together. REDUVIUS Lamarck h. Color piceous. Widely distributed in the United States. (Fig. 20). R. PERSONATUS hh. More or less testaceous in color. Southwestern states. R. SENILIS ee. Apex of scutellum broad, with two or three spines. ECTRICHODIINÆ f. First segment of the antenna about as long as the head. _E. cruciata_ Pa. and south; _E. cinctiventris_, Tex. and Mex. _Ectrichodia_ L. et S. ff. First segment of the antennæ short. _P. æneo-nitens_. South. _Pothea_ A. et S. cc. Ocelli cephalad of the hind margins of the eyes; first segment of the antennæ stout, second segment divided into many smaller segments. South and west. _Homalocoris maculicollis_, and _Hammatocerus purcis_. HAMMATOCERINÆ bb. Hemelytra with a quadrangular or discoidal areole in the corium near the apex of the clavus (fig. 159e). c. Anal areole of the membrane not extending as far proximad as the costal areole; basal segment of the antenna thickened, porrect; the other segments slender, folding back beneath the head and the first segment STENOPODINÆ d. Head armed with a ramous or furcate spine below each side, caudad of the eyes. e. First segment of the antenna thickened, apex produced in a spine beyond the insertion of the second segment. Species from Va., Ill. and south. _Pnirontis_ Stäl. ee. First segment of the antenna not produced beyond the insertion of the second segment. _Pygolampis_, N. E. states and south; _Gnathobleda_, S. W. and Mex. dd. Head unarmed below or armed with a simple spine; rarely with a subfurcate spine at the side of the base. Carolina, Missouri and south. _Stenopoda_, _Schumannia_, _Diaditus_, _Narvesus_, _Oncocephalus_ cc. Anal areole of membrane extending farther proximad than the costal areole. d. Ocelli farther apart than the eyes. _A. crassipes_, widely distributed in the United States; other species occur in the southwest. _Apiomerus_ Hahn. dd. Ocelli not so far apart as the eyes. ZELINÆ e. Sides of mesosternum without a tubercle or fold in front.