SCUTELLEROIDEA OF IOWA 105 
on each side; collum distinct, whitish; humeri rounded, not prominent. 
Seutellum black with a yellowish white spot at each antero-lateral angle, 
the tip and a central cross orange. Hemelytra a little narrower than abdo- 
men, orange, crossed by two oblique, irregular black bands; membrane 
dusky, the nervures distinct, simple; clavus pale orange to yellowish white. 
Tergum black, the posterior one-fourth and most of the outer margin of 
the connexivum yellowish white; incisures black. Venter shining blue- 
black, impunctate, the abdominal segments at their margins bearing a row 
of triangular whitish spots; just within these at the anterior margin of 
each segment is a row of smaller spots of the same color, and again within 
these is another row of spots, the inner half of each spot yellowish white, 
the outer half orange; on the mid-ventral line is still another row of parti- 
eolored orange and white spots. Sternal plates shining blue black, all the 
coxal borders whitish anteriorly and in addition, the metasternum has two 
white spots and the mesosternum and prosternum one each; outer and 
posterior margins of mesosternum whitish; anterior and posterior margins 
of prosternum of the same color. Head beneath and bucculae marked 
with whitish. Legs fuscous marked with whitish, the tarsi and apical half 
of tibiae very hairy; inner face of anterior tibiae with a small sharp 
spine. Length, 9.5-12.0 mm. Width across pronotum, 5.75-6.5 mm. 
Needless to say a good deal of variation in color pattern ob- 
tains in this conspicuously marked pentatomid which, on this 
latter account, has received among others, the names Harlequin 
Bug and Calico Bug. However, a discussion of the variations 
need not be included here since many more or less detailed de- 
scriptions of this abundant and injurious species are easily 
available. 
This bug is typically southern in its distribution, having been 
first reported in the United States from Texas in 1864 when it 
destroyed great numbers of cultivated cruciferous plants. Since 
that time it has gradually increased its distribution to the north- 
ward along the Atlantic coast and up the Mississippi River val- 
ley. By 1870 it had reached Missouri; in 1876 it had reached 
Delaware, in 1891 it had reached Ohio, in 1892 it was recorded 
as injurious in New Jersey and in 1894 it was reported from 
New York. Specimens were reported from California in 1878 
and the species had been recorded from Pueblo and Denver, 
Colorado, in 1882. 
‘“‘The northward migration of the harlequin bug, although 
not without interruption, was apparently quite steady until 
recent years. Beginning with the year 1897, at which time the 
insect had reached its maximum as a pest in Maryland, Vir- 
