SCUTELLEROIDEA OF IOWA 115 
abdomen ; anterior tibiae distinctly expanded; frena not more 
than one-third the length of seutellum............ Stiretrus 
Seutellum moderate, narrowed towards apex; anterior tibiae 
very slightly enlarged near tip; frena one-half the length of 
SUPPRCHMUNEIM ER e122)... co-) sss cis che ohh a a bee es Be ae ..Perilus 
Anterior femora unarmed 
Tylus usually shorter than juga leaving apex of head emar- 
ginate; length usually more than 13.0 mm....... Apateticus 
Tylus and juga equal in length, leaving apex of head trun- 
eate; length usually less than 138.0 mm............. Podisus 
Genus STIRETRUS Laporte 
1832. StirETRUS Laporte de Castelnau, Essai. Classif. Syst. 
Hém., 75. 
This genus is confined exclusively to America, most of the 
twenty-nine forms being found in the Chilean subregion al- 
though a few reach Mexico and five forms are recorded from 
North America. The species have a tendency to vary to a consid- 
erable extent and this has resulted, in many cases, in extensive 
synonymy. The principal generic characters are as follows: 
Thorax twice as wide as long. Scutellum long and broad, reaching 
nearly to apex of abdomen which is armed with a spine at base. In our 
species the anterior tibiae are dilated and the frena are very short; ante- 
rior femora with a blunt spine or tubercle near tip. 
But a single species of the genus has been recorded for Iowa 
by Professor Osborn and im all our collecting other specimens 
have not been discovered. 
Stiretrus anchorago (Fabricius) 
1775. Cimex anchorago Fabricius, Syst. Ent., 699. 
1781. Cimex anchorago Fabricius, Spec. Ins., II, 341. 
1794. Cimex anchorago Fabricius, Ent. Syst., IV, 86. 
1808. Tetyra anchorago Fabricius, Syst. Rhyng., 137. 
1837. Pentatoma pulchellus Westwood, Cat. Hope, I, 42. 
1851. Stiretrus anchorago Dallas, List Hem., I, 80. 
1870. Stiretrus anchorago St&l, Svensk. Vet. Handl., 9, no. 1, 24. 
1876. Stiretrus anchorago Uhler, Bull. U. S. Geol. Geogr. Surv., IJ, 281. 
1904. Stiretrus anchorago Van Duzee, Trans. Am. Ent. Soc., XXX, 63. 
'1907. Stiretrus anchorago Schouteden, Gen. Ins., fase. 52, 8. 
1909. Stiretrus anchorago Kirkaldy, Cat. Hem. (Heterop.), I, 32. 
1912. Stiretrus anchorago inflata Schumacher, Sitz.-Ber. Ges. natf. Freunde, 96. 
Body ovate, convex, narrowing gradually posteriorly, sparsely, coarsely 
and irregularly punctate. Ground color blue black marked with orange. 
Head blue black with purplish reflections, deeply, coarsely punctate with 
ocelli and a median spot at posterior margin orange; sides nearly parallel; 
