26 IOWA STUDIES IN NATURAL HISTORY 
of the scutellum and pronotum; the color of niger is a mora 
opaque black. 
Specimens of 7. nitiduloides are at hand from Ames, Ankeny, 
Burlington, Chariton, Corning, Decorah, Ft. Madison, Glen- 
wood, Granite, lowa City, Lake Okoboji, Monticello, Red Oak, 
Shenandoah and Solon. Osborn also recorded the species from 
the state. 
This form is more characteristic of the western fauna and 
although the records show that it is generally distributed over 
Jowa it is the most common in the western part of the state. At 
Lake Okoboji it is the most common thyreocorid of the region 
and is usually found in low places along the edge of woods, often 
on hazel, and on prairie hillside pastures. Most of the nymphs 
secured have been taken in July. 
Thyreocoris niger (Dallas) 
1851. Corimelaena nigra Dallas, List Hem., I, 57. 
1904. Corimelaena nigra Van Duzee, Trans. Am. Ent. Soc., XXX, 6. 
1911. Thyreocoris niger Zimmer, Univ. Neb. Contrib. Dept. Ent., no. 4, 27. 
General form broadly ovate, widest behind thorax. Deep black to 
closely punctate. Head a little broader than long, rounded in front, 
thickly and finely punctate, the margins not sinuate. Antennae reddish 
brown, thickly covered with fine yellowish hairs. Rostrum reddish browa, 
extending to posterior coxae. Pronotum broadly rounded, thickly pune- 
tured, the punctuation more dense towards the margins; posterior half 
more or less transversely wrinkled; anterior angies produced forward, the 
lateral margins before the posterior angles slightly sinuate. Seutellum 
convex, the base transversely wrinkled; at either side of the base is a 
deep excavation which is confluently punctate; sides near the base dis- 
tinctly sinuate. Hemelytra with coriaceous portion entirely black. Venter 
black, shining, the disk nearly smooth, the sides thickly, finely punctate. 
Legs black, the tibiae furnished with numerous heavy spines; tarsi yel 
lowish brown. Length, 3.0-4.5 mm. Width across pronotum, 2.5-3.5 mm. 
Three specimens which I provisionally place in this species 
are at hand from Glenwood and Shenandoah in southwestern 
Iowa. These three specimens are smaller than the average for 
this species and are very like nztiduloides except in the general 
form which is a little broader and more ovate than that species, 
in the transverse wrinkling on the bases of pronotum and seutel- 
lum and in the duller more opaque color. These transverse 
wrinkles which are so evident in my specimens making them 
quite distinct from any other form I have taken in Iowa, econsti- 
