60 IOWA STUDIES IN NATURAL HISTORY 
specimen and that in a student collection; it, too, was taken in 
July. 
One of my specimens, a female, was taken from a lily pad 
in the water of Douglas Lake. Another was taken in beating 
the vegetation growing along the edges of beach pools at Sedge 
Point. My other specimens were taken from vegetation grow- 
ing in low and more or less swampy situations. 
This is proportionately the narrowest and most linear of the 
Douglas Lake pentatomids and is not unlikely to be mistaken 
for a capsid. However, the present form has five antennal 
segments, while the capsids have but four. In addition M. 
lateralis is of a yellowish brown color mottled with reddish. 
Length, 7.0—9.0 mm. 
Elasmostethus cruciatus (Say) 
This is another typically northern representative of the group. 
While it is more widely distributed than M. lateralis, having 
been reeorded as far to the southwest as New Mexico, it seems, 
in general, not to be so common as that form. I have but one 
specimen from the Douglas Lake region; it is a typically colored 
female taken August 2, 1920, in sweeping the vegetation along 
the low, swampy shore of the lake west of Bryant’s Hotel. Mr. 
R. F. Hussey has told me of a specimen taken by him in the 
summer of 1918. 
Subfamily Asopine 
Perillus bioculatus var. (b.) clauda (Say) 
On July 18, 1919, a Perillus nymph, probably of this species 
and the only representative of the genus taken during the 
summer, was swept from a low, grassy area in a field of rye 
which had been eut shortly before. This field was about one 
and one-half miles northeast of North Fishtail Bay and well 
out in the open cultivated district. 
A single dead specimen, an adult male, was found on one of 
the shelves in Houghton Hall July 4, 1920. The bug had 
probably crawled into the building for protection at the time 
of hibernation, but had not been able to survive the rigorous 
Michigan winter. The antenne of this specimen are entirely 
black. 
This conspicuously marked black and red pentatomid is con- 
