=Deltocephalus flavicosta= Stal. Quite abundant during middle and late summer, principally in southern part of state. Swept from native grasses and weeds. Occasional specimens taken from wheat. =Deltocephalus sayi= Fitch. Recorded from grass lands in North western parts of state in September. Quite common in blue grass. =Deltocephalus inimicus= Say. Common in all parts of the state. All stages taken from May to November. Food plants include wheat, oats, alfalfa, clover, cowpeas, timothy, blue grass, other native grasses, and weeds. =Deltocephalus albidus= Osb. & Ball. Recorded from the collection of the Experiment Station at Columbia. =Deltocephalus obtectus= Osb. & Ball. Quite scarce. Recorded only from Mississippi County. Near swamps. =Deltocephalus misellus= Ball. Captured but one adult, in a corn field near Mississippi River at West Quincy. =Deltocephalus productus= Walker. Rather scarce. Swept from clover and weeds at Stanberry. =Deltocephalus debilis= Uhler. Quite common on grasses in rye and wheat stubble fields about Hannibal and West Quincy. =Athysanus exitiosus= Uhler. Occurs throughout the state. With the exception of Draeculacephala mollipes it is the most common jassid of northwestern Missouri. Adults present at all seasons of the year. Food plants include wheat, oats, corn, alfalfa, grasses, and weeds. =Athysanus bicolor= VanDuzee. Numerous in southern part of state, especially in low or bottom lands. Feeds upon many weeds, grasses and alfalfa. =Athysanus obtutus= VanDuzee. Not common. A few adults taken from sweeping wheat fields in the early spring. Recorded only from Mississippi County. =Athysanus plutonius= Uhler. Rather rare. Occasional specimens swept from wheat in Scott and Mississippi Counties. =Athysanus curtisi= Fitch. Only one adult captured sweeping weeds at Hannibal. =Eutettix clarivida= VanDuzee. Recorded from Lutesville and Charleston, from millet and grasses. Nymphs numerous during August. =Eutettix osborni= Ball. Collected by Geo. W. Barber at Poplar Bluff, from White Aster, used in ornamental plantings. =Eutettix seminuda= Say. Rather numerous but not abundant. Occurring in all parts of the state. Collected principally from weeds and woody shrubs near swamps. Also from grape vines. =Eutettix strobi= Fitch. Only one adult captured. Feeding on a leaf of a willow tree growing in a swamp. =Phlepsius apertus= VanDuzee. Very common throughout the state, especially in the southeast section. Occurs in great numbers on alfalfa and clover upon which crops they must be considered a pest. Also recorded from grasses and weeds. Most abundant during July and August.