SCUTELLEROIDEA OF IOWA 87 
duplication of statements a detailed diagnosis is omitted and 
only the principal differentials are included above. 
Osborn records this species from the state with the following 
comment: ‘‘One specimen, doubtless taken in the State, in col- 
lection of H. H. Raymond.’’ (Proc. Ia. Acad. Sei., I, Pt. II, 
121, 1892.). During the course of our work but seven specimens 
have been taken at Algona, Lake Okoboji and Sioux City. Such 
habitats as are chosen by L. variolarius are likely to yield speci- 
mens of this form. 
Genus COENUS Dallas 
1851. Cornus Dallas, List Hem., I, 194 and 230. 
But a single species, the distribution of which is confined to 
North America, is included in this rather unique genus. Only 
the principal diagnostic characters are herewith given. 
Body ovate, somewhat convex above and very convex beneath. Head 
slightly convex on dorsal surface, the apex rounded, the tylus reaching the 
anterior margin; sides of head sinuate in front of eyes. Antennae with 
basal segment shortest and apical segment longest. Rostrum extending 
between posterior coxae, the basal segment a little shorter than the parallel 
bucculae. Pronotum with lateral margins smooth, the lateral angles round- 
ed, not produced. Scutellum broadly rounded at apex. Hemelytra with 
inner half of apical margin parallel with margin of scutellum, the outer 
half rather abruptly transverse, the inner angle rounded; veins of mem- 
brane reticulate. Abdomen unarmed at base. Tibiae furnished with mod- 
erate spines; basal tarsal segment as long as the two apical segments 
together. Osticlar opening without sulcus. 
Coenus delius (Say) (Puate V, Ficure 10) 
1831. Pentatoma delia Say, Desecr. Het. Hem., 8. 
1843. Hymenarcys aeruginosa Amyot and Serville, Hém., 125. 
1851. Coenus tarsalis Dallas, List Hem., 230, Pl. 8, fig. 6. 
1859. Pentatoma delia Say, Compl. Writ., I, 320. 
1868. Coenus punctatissimus Vollenhoven, Versl. Ak. Amst. Nat., (2), II, 183. 
1872. Coenus delius Stal, Svensk. Vet. Handl., 10, no. 4, 30. 
1878. Coenus delius Uhler, Proc. Bost. Soe. Nat. Hist., XIX, 376. 
1904. Coenus delius Van Duzee, Trans. Am, Ent. Soe., XXX, 49. 
General form ovate, widest behind middle. Color pale yellow to yellow- 
. ish brown, sometimes slightly suffused with pinkish; covered with large, 
deep black punctures which are massed closer together on either side of 
the median carina of head and on the submargins of pronotum. MHead 
narrow, elongate, somewhat convex, with median, impunctured, pale carina 
which is less prominent on posterior third. Antennae dark rufous, fifth 
segment and apical half of fourth fuscous; basal segment shortest, second 
a little longer, third longer than second, fourth shorter than third but 
longer than second, the fifth longest. Rostral sheath pale yellow, the 
