SCUTELLEROIDEA OF IOWA tye) 
be referred to this species, the typical bioculatus, and was taken 
at Clinton, April 20. A nymph, about one-third grown, taken 
at Iowa City, August 20, is apparently of the form clauda and 
an adult female taken in June at Sioux City should also be re- 
ferred to this form. 
This species shares the predaceous habits of its allies, and has 
been recorded by Howard as destroying the larvae of Leptino- 
tarsa decemlineata Say ; however, it is apparently not anywhere 
of sufficient abundance to be of great value in checking the in- 
erease of noxious insects. 
Perillus circumcinctus Stal 
1862. Pervillus circumcinctus Stal, Stett, Ent. Zeit., XXIII, 89. 
1872. Perillus marginatus Provancher, Nat. Can., IV, 74. 
1878. Perillus cirewmcinctus Uhler, Proc. Bost. Soc. Nat. Hist., XIX, 370. 
1880. Perillus cirewmcinctus Distant, B. C. A., Rhynch. Het., I, 34, Pl. 4, fig. 6. 
1904. Perillus circumcinctus Van Duzee, Trans. Am. Ent. Soc., XXX, 67. 
1909. Perilloides circumcinctus Kirkaldy, Cat. Hem. (Heterop.), I, 7. 
This and the preceding form are extremely close together and 
I am unable to differentiate them with any degree of satisfac- 
tion owing to the prevailing tendency to vary. In the specimens 
I determine as circumcinctus however, the form is narrower and 
somewhat more convex, particularly above; the pronotum is 
also quite markedly longer than in bioculatus. In addition to 
this, the character of the antennae seems to hold fairly well in 
my specimens, those with the long pronotum and which are 
more convex having the antennae black with the first two seg- 
ments and at least the basal portion of the third segment rufous. 
However, Zimmer in his ‘‘Pentatomidae of Nebraska,’’ (Univ. 
Neb. Contrib. Dept. Ent., no. 4, 17, 1911) says that his speci- 
mens show every intergradation between typical bioculatus and 
circumcinctus in all the characters above mentioned and he is 
inclined to think that they are ‘‘but two extremes of an ex- 
ceedingly variable form.’’ 
Professor Osborn records but a single specimen of this species 
‘from Sioux City and since no other records of specimens are at 
hand that record stands alone. Specimens from Minnesota and 
Illinois are in my collection. 
Perillus exaptus (Say) 
1825. Pentatoma exapta Say, Journ. Acad. Nat. Sci. Phila., IV, 318. 
1837. Pentatoma variegata Kirby in Rich. Faun. Bor. Am., IV, 267. 
1851. Zicrona marginella Dallas, List Hem., I, 109. 
