110 IOWA STUDIES IN NATURAL HISTORY 
Key to the species 
Postero-lateral angles of abdominal segments slightly prominent, 
acuminate 
Second segment of antennae about one-half the length of 
third; head broad anteriorly; ventral abdominal punctures 
more numerous, darker. ..¢ 3:3. -2- 54-500 eee dimidiata 
Second segment of antennae a little shorter than third; head 
narrowed anteriorly; ventral abdominal punctures few, pale 
wae p88 Bo bpel owed baw) al idle (ge 0) ete ea, Senet ee rd calva 
Postero-lateral angles of abdominal segments not prominent, 
obtuse; color clear green: 22...3 2.24.2. - oe euchlora 
Banasa dimidiata (Say) (Puate III, Ficure 3) 
1831. Pentatoma dimiata Say, Descr. Het. Hem., 7. 
1859. Pentatoma dimidiata Say, Lec. in Say, Compl. Writ., I, 318. (emended). 
1876. Banasa dimidiata Uhler, U. S. Geol. Geogr. Surv., II, 291. 
1904. Banasa dimidiata Van Duzee, Trans. Am. Ent. Soc., XXX, 60. 
1909. Banasa dimiata Kirkaldy, Cat. Hem. (Heterop.), I, 122. 
General form rather narrowly elongate ovate. Color dark reddish to 
olive brown, shining, the head and.-a little more than anterior half of pro- 
notum greenish to yellowish. Head flattened above and uniformly, sparse- 
ly punctate, not narrowed much anteriorly, the sides a little sinuate in 
front of the eyes. Antennae rufous, the two basal segments and extreme 
base of third segment greenish yellow, the first and second segments about 
equa! and not more than half as long as third. Rostrum slender, extend- 
ing on to second visible ventral segment, greenish, with the apical portion 
of fourth segment blackish. Pronotum deflexed anteriorly, sparsely, irregu- 
larly punctate on anterior pale portion, more coarsely and closely punce- 
tured on dark basal part; antero-lateral margins straight, the humeri not 
prominent. Scutellum reddish brown, sparsely punctate, the tip whitish 
green and impunctate. Hemelytra coarsely, closely and shallowly punce- 
tate, the embolium green, the remainder reddish brown; membrane hya- 
line, the nervures simple. Tergum purplish black with tip rufous, some- 
times entirely rufous, shining, the margin yellowish. Venter yellowish 
more or less suffused with greenish, smooth at middle but the sides with 
numerous brownish irregularly disposed punctures. Legs greenish, the 
tibiae and tarsi darkest; apices of tibiae and tarsal segments reddish 
brown. Length, 8.0-11.0 mm. Width across pronotum, 4.75-6.0 mm. 
No other Iowa pentatomids have the color of the entire ante- 
rior half of the pronotum so sharply delimited from the color 
of the posterior half as this and the following species, and on 
this account they are readily referable to this genus. However, 
the combination of characters given in the key will usually suf- 
fice for distinguishing these two elosely allied forms. 
