88 IOWA STUDIES IN NATURAL HISTORY 
bristles fuscous. Pronotum coarsely, irregularly punctate, the antero-lat- 
eral margins straight, pale yellowish, usually impunctate but sometimes 
with faint reddish punctures; extreme edges black; humeri rounded, not 
prominent. Scutellum coarsely, irregularly punctured, not much narrowed 
towards apex which is broadly rounded. Hemelytra coarsely punctate, 
broadly rounded at tip, usually not quite as wide as abdomen; membrane 
whitish, the veins forming an irregular network. Tergum black, closely, 
regularly punctured; margin yellowish, not as sparsely punctate. Beneath 
yellowish, the side pieces of the thorax sparsely and deeply punctured, the 
abdominal segments, especially the apical ones, more finely and closely 
punctured. Legs yellowish, thickly dotted with fuscous, the tibiae with 
numerous, moderately stout spines and a few on the under side of the 
femora. Length, 8.5-11.0 mm. Width across humeri, 4.5-6.5 mm. 
This pentatomid may be distinguished from the other repre- 
sentatives of our fauna by the smoothly convex oval form, 
widest behind the middle, the slightly convex head with the 
prominent, impunctate but finely, transversely creased median 
carina, the rounded humeri which are not wider than the heme- 
lytra and the irregularly reticulate venation of the wing mem- 
brane. 
Professor Osborn recorded Coenus delius as rare in Iowa. 
However, many specimens are in our collection from Algona, 
Ames, Clarion, Des Moines, Emmetsburg, Estherville, Fairfield, 
Hills, Indianola, Iowa City, Lake Okoboji, Marengo, Nichols, 
Sae City, Sioux City, Solon and Waukon. 
Timothy and clover fields, particularly those in more or less 
moist situations, are the places most frequently chosen by this 
insect. The vegetation of semicultivated roadsides will fre- 
quently harbor it In some numbers, especially if there is more 
or less timothy and blue grass present. Low lying blue grass 
pastures are also favored habitats. 
Hibernating forms are not uncommon and specimens may be 
found in early spring under boards, sticks and rubbish in pas- 
tures and along the grassy edges of fields. Our earliest spring 
record is February 27. 
Judging from the material at hand this species breeds rather 
later in the year than most of our pentatomids and it appears 
to be single brooded with us. All the nymphs have been taken 
in July. At Lake Okoboji in the summer of 1916 adults were not 
taken earlier than July 4 and nymphs in all stages were moder- 
ately common during that month. 
