SCUTELLEROIDEA OF IOWA 23 
ond segment much shorter than the others. Rostrum not extending on to 
abdomen, the second segment longest. Pronotum transverse, the lateral 
borders rounded, the posterior border slightly sinuate at middle. Scutel- 
lum large, deeply convex, not covering outer part of corium but usually 
entirely covering the membrane and abdomen. Tibiae furnished with 
spines. 
Key to the species 
Hemelytra concolorous, not marked with paler 
Surface highly polished; punctures almost obsolete on dorsal 
surface; corium without a prominent ridge parallel to subcost- 
al nervure; form regularly oval; length, 5.0-6.0 mm.....ater 
Surface distinctly punctured; corium with a prominent ridge 
within and parallel to subcostal nervure; length 4.0-4.5 mm. 
Form more or less narrowed posteriorly ; somewhat polished ; 
distinctly but not closely punctured; base of pronotum not 
or scarcely transversely wrinkled ............ mitiduloides 
Form short, oval; somewhat opaque and closely punctured ; 
base of scutellum and pronotum transversely wrinkled 
ee Ge a miger 
Hemelytra marked with white or yellow 
Pale margin of corium narrowed at base and not crossing sub- 
costal nervure: lencth, 3:5-4.0 mm,’ .;..........02 2. lateralis 
Pale margin of corium broad at base, crossing subcostal 
meme tenathy,, 2.9-0.0 MM. 23685 65 ke a pulicarius 
Thyreocoris ater (Amyot and Serville) (Puatre II, Figure 2) 
1811. {||Tetyra helopioides Wolff, Ic. Cim., V, 174. 
1839. +Odontoscelis unicolor Germar, Zeitschr. Ent., I, 37. 
1843. Galgupha atra Amyot and Serville, Hem., I, 68. 
1851. ~7fCorimelaena unicolor Dallas, List Hem., I, 57. 
1876. +Thyreocoris unicolor Stal, Svensk. Vet. Handl., 14, no. 4, 23. 
1878. Corimelaena atra Uhler, Proc. Bost. Soc. Nat. Hist., XIX, 366. 
1904. ~{Corimelaena unicolor Van D., Trans. Am. Ent. Soc., XXX, 4. 
1915. {fThyreocoris unicolor Stoner, Ent. News, XXVI, 354. 
General form broadly ovate not narrowed markedly posteriorly. Color 
black or bronzed black and usually highly polished. Punctuation not so deep, 
close or uniform as in T, nitiduloides. Head broad, rounded, irregularly 
‘punctate except at base; anterior margin a little indented at middle; 
lateral margins sinuate. Antennae longer and stouter than in TZ. niti- 
duloides, dark reddish brown to black, the two apical segments usually 
darkest and noticeably longer than in 7. nitiduloides. Rostrum dark red- 
dish brown to black; apical segment always black; extending to posterior 
coxae. Pronotum convex, broad, highly polished especially on disk where 
the punctures are fine, sparse and shallow; punctuation denser towards 
