118 IOWA STUDIES IN NATURAL HISTORY 
Elongate, somewhat broadly ovate, apical one-third of abdomen tapering 
markedly posteriorly. General color black with the characteristic pale 
markings varying from orange to crimson. Head black, densely, irregu- 
larly punctured, less closely punctured at base; tylus and juga of equal 
length, the former with a prominent subapical concavity. Rostrum deep 
black, paler at the incisures, moderately heavy. Antennae black, incisures 
only pale. Pronotum pale rufous to deep crimson, with two large trans- 
verse black spots and posterior margin black; deeply, sparsely, irregularly 
punctured, the punctures finer and closer on posterior one-fourth; humeral 
angles bluntly angulate, not prominent. Scutellum sparsely punctate at 
base, much more finely and closely punctate on posterior one-half; black, 
except a broad, submarginal pale rufous to deep crimson vitta; the en- 
closed black area sometimes more or less bifid anteriorly, the black exte- 
rior to the vitta extending about three-fourths the length of the scutellum. 
Hemelytra black, with pale rufous to deep crimson at least on basal part 
of costal margin and sometimes extending along the whole of this margin; 
coriaceous portion blackish at tip; membrane fuscous, pale at margin. 
Venter pale rufous to crimson, deeply and rather regularly punctate ex- 
cept at middle; median line with two series of black spots, the spots of 
this series united on the last segment; on each side of the median series is 
another double series of black spots, the inner row of three large spots, 
the outer row of five smaller ones; the ultimate segment thus has but 
three spots. Genital area black or fuscous. Ventral spine long, slender, 
reaching to posterior coxae; tergum purplish, the connexivum pale rufous 
to crimson; side pieces of thorax black or fuscous. Legs black or fus- 
cous; tibiae with a pale yellowish ring or dot near middle. Length, 8.0- 
11.5 mm. Width across pronotum, 5.5-7.0 mm. 
The form above described is the typical bioculatus which in- 
cludes Say’s ‘‘variety b’’ and ‘‘variety e’’ of Pentatoma clauda 
and has the basal segment of the antennae black with the in- 
cisures only slightly paler. The other form, clauda, of this 
species is brown or piceous with the typical markings ivory 
white; the hemelytra are white with a black inner margin and a 
median triangular vitta. In all the specimens of this form 
which I have seen only the basal segment of the antennae and 
the incisures are pale; the head is also reddish brown, blackish 
at base; venter pale yellow and legs rufous. This is Say’s 
typical clauda and includes also his ‘‘variety a.’’ 
Professor Osborn listed the form Perillus claudus Say from 
the state as a distinct species (Proc. Ia. Acad. Sci., I, pt. I, 121, 
1892) and indicated that it occurred rarely in Iowa. It now is 
the generally accepted belief that clauda is but a variety of 
bioculatus. My collection contains but one specimen which can 
