20 IOWA STUDIES IN NATURAL HISTORY 
Body oval or widely ovoid, subdepressed. Head equal to or a little 
shorter than pronotum, triangular, not or indistinctly sinuate in front of 
eyes, flattened above, wider than long. Rostrum reaching almost to pos- 
terior coxae; second segment at least equal in length to third and fourth 
together. Antennae of five segments, the first not extending beyond an- 
terior margin of head, the second curved, the first three segments of 
practically the same length or the second segment a little longer than the 
first or third. Pronotum almost twice as wide as long, hexagonal. Pros: 
tethus slightly dilated in front, becoming smaller and rounded towards 
rostrum. Orifices prolonged into a groove. Scutellum as long as but 
somewhat narrower than abdomen, the margins subparallel or slightly 
diverging from the base. Venter not grooved but the base with a slight 
median longitudinal depression; sides flattened, the borders straight. 
Tibiae grooved more or less distinctly on superior face. 
Eurygaster alternatus (Say) (Puate I, Figure 1, and Puats II, 
FIGureE 1) 
1828. Tetyra alternata Say, Amer. Enft., 111, Pl. 43, lower left fig. 
1851. Eurygaster alternatus Dallas, List Hem., I, 47. 
1859. Tetyra alternata Say, Compl. Writ., I, 94, Pl. 43, fig. 3. 
1872. Euwrygaster nicoletanensis Proy., Nat. Can., IV, 73. 
1877. Eurygaster alternatus Uhler, Bull. U. S. Geol. Geogr. Surv., III, 365. 
1904. EHurygaster alternatus Van D., Trans. Am. Ent. Soc., XXX, 18. 
1909. Eurygaster alternatus Kirkaldy, Cat. Hem. (Heterop.), I, 273. 
Body elongate oval, depressed, triangular before, widest behind middle 
and broad at posterior end. Color varying from rufous to yellow, closely, 
irregularly and rather finely punctate. Head short, convex, somewhat 
narrowed anteriorly, rounded at tip; tylus attaining apex of head and 
bordered on either side by a black line which is continued to posterior 
border of head; margin of head paler; beneath with a black line from 
eyes to apex of cheeks. Rostrum pale yellow, the two apical segments 
fuscous. Antennae fuscous, basal segment pale yellow, apical segment 
longest and blackish. Pronotum only slightly convex, rather uniformly 
and densely punctured; posterior angles obtusely rounded, the postero- 
lateral edge almost straight; antero-lateral margins nearly straight; on 
either side of the more or less distinct smooth median longitudinal line 
is a darker longitudinal line, sometimes faint, sometimes well marked, 
which diverges from the median line as it proceeds backward; callosities 
transverse, usually faintly marked. Scutellum rufous to yellow, narrower 
and longer than abdomen, the edges almost straight; a slightly curved, 
smooth, raised line at base and from this a slightly carinate longitudinal 
line extends backward and disappears on the posterior half which is 
depressed; median line pale yellow and expanded posteriorly; the entire 
scutellum more or less marked with short, transverse or semitransverse 
black lines composed of series of punctures. Coriaceous portion of 
hemelytra similarly marked. Connexivum with a series of black punctures 
forming a quadrate spot at the middle of each segment. Pleurae more 
