52 IOWA STUDIES IN NATURAL HISTORY 
sidewalk at Camp Davis, the University engineering camp, con- 
stitutes our only record. 
Apparently the species is not even locally common in the 
region, but it is very gratifying to know that it is not unlikely 
to be met with in the vicinity of the Biological Station. And 
it is also interesting from a zoological standpoint to note the 
extension of its range during the past fifteen years. 
The small size (6.0—7.0 mm.), clypeate head, flattened and 
laminated connexivum and the rather short and bluntly round- 
ed scutellum will at once distinguish this from any other 
Michigan pentatomid. 
Peribalus limbolarius Stal 
One nymph taken along the edge of an oats field near Riggs- 
ville, about four miles from Douglas Lake on July 29, 1919, 
constitutes our only record of this bug for the region. 
The species is found generally throughout the United States 
and Canada. In most sections of the United States this is 
usually an abundant or at least common bug, and its apparent 
rarity here seems worthy of comment. However, in my ex- 
perience in Iowa and other points farther west, the insect is 
commonly found in well cultivated districts. Not very many 
such areas occur in the immediate vicinity of Douglas Lake, but 
a number of excursions were made to outlying cultivated areas 
such as the one first mentioned, but with results as noted. 
Chlorochroa uhlert Stal 
This is another species which, in the adult stage, is not often 
met with in the region until the latter part of July. Indeed, 
adults of this form seem, in general, to appear later in the 
season than most other pentatomids and the height of abundance 
of adults occurs between July 15 and August 10. 
Nymphs in the first and second instars were swept in con- 
siderable numbers from smooth sumach (Rhus glabra) on June 
29, 1920. At this time also one adult was found. Often, too, 
nymphs and adults are found on blueberry bushes (Vaccinium 
pennsylvanicum) of which an abundance occurs in the vicinity 
of the Station. However, I am not sure that they feed on this 
plant, for several nymphs which I confined in a cage and fur- 
nished with fresh blueberry stalks daily could not be observed 
