SCUTELLEROIDEA OF IOWA 117 
Genus PERILLUS 8tal 
1862. PrEriuLus Stal, Stett. Ent. Zeit., XXIII, 88. 
Of the seven described forms comprising this Nearctice genus, 
all but one are found in North America. Three forms are re- 
corded from Iowa but all are apparently quite rare in the state 
since only a very few specimens have been taken. Our repre- 
sentatives of the genus are somewhat variable as to coloration 
though all have a similar general facies. These forms are also, 
for the most part, predaceous and have been recorded as feeding 
upon various noxious insects; however, they are scarcely suffi- 
ciently abundant with us to be of material economic importance. 
The genus may be diagnosed as follows: 
Basal segment of rostrum heavy. Lateral angles of pronotum unarmed. 
Scutellum moderate in size, triangular, not reaching much beyond base of 
membrane of hemelytra; frena extending to middle of scutellum. Anterior 
femora armed beneath with a spine or blunt tubercle; middle and posterior 
femora unarmed. Ventral abdominal spine reaching only to posterior 
coxae. 
Key to the species 
Anterior femora armed with a stout cylindrical spine; length, 
8.0-11.5 mm. 
Broader, less convex, pronotum shorter; antennae usually 
black with incisures and basal segment only pale or rufous 
ee cl a ie le sles broculatus 
Narrower, convex; pronotum longer; antennae black with two 
basal segments and basal half of third segment pale or rufous 
ee ahr eee he olen. Go cure le wie ak circumcinctus 
Anterior femora armed with a low blunt tubercle; length 5.0— 
feo... ek A eke c laa HAW ENG I area Aiea Ger iiclni Dy exaptus 
Perillus bioculatus (Fabricius) (PuatTe III, Figure 4, and 
Puate VII, Ficure 3) 
1775. Oimex bioculatus Fabricius, Syst. Ent., 715. 
1872. Perillus bioculatus Stal, Svensk. Vet. Handl., 10, no. 4, 129. 
1895. Mineus bioculatus Gillette and Baker, Hem. Colo., 12. 
1904. Perillus bioculatus Van Duzee, Trans. Am. Ent. Soc., XXX, 66. 
1907. Perilloides bioculatus Schouteden, Gen. Ins., fase. 52, 37. 
var. (b) clauda (Say) 
1825. Pentatoma clanda Say, Journ. Acad. Nat. Sci. Phila., IV, 313. 
1859. Pentatoma clanda Say, Compl. Writ., II, 240. 
1876. Perillus claudus Uhler, Bull. U. S. Geol. Geogr. Surv., II, 281. 
1877. Perillus claudus Uhler, Bull. U. S. Geol. Geogr. Surv., III, 398. 
1904. Perillus bioculatus Van Duzee, Trans. Am. Ent. Soc., XXX, 67. 
1907. Perilloides bioculatus Schouteden, Gen. Ins., fase. 52, 37. 
