54 IOWA STUDIES IN NATURAL HISTORY 
euschistoides have been for four or five days and still are at the 
height of their abundance for the season.”’ 
The local status of this as well as other species of pentatomids 
seems to fluctuate considerably from season to season for, while 
the present form was very abundant during the season of 1919, 
only eleven specimens, of which but four are adults, were taken 
during the season of 1920. 
Most of my specimens are typically colored, although a few 
have the hemelytra suffused with pinkish. 
Mormidea lugens (Fabr.) 
But one specimen, a half grown nymph taken on July 11, 
1919, from the reeds at Sedge Point, represents this species. 
The general distribution of the species would suggest that it 
should be found rather more commonly in the region than one 
would be led to believe from our single record. However, I 
have never found this to be a common form in any locality. 
The adult may be distinguished from all other pentatomids 
in our fauna by the size (6.0—7.5 mm.), the general grayish 
olive color with two transverse abbreviated yellowish white lines 
anteriorly on the pronotum, and the black scutellum margined 
with yellowish white. 
Euschistus euschistoides (Voll.) 
Searcely any habitat of the region is without its fair quota of 
individuals of this pentatomid, for it is one of the commonest 
and most generally distributed species as well as the most 
abundant member of the genus. 
Adults are not uncommon in late June, though they become 
much more numerous later in the season, the height of abun- 
dance being between August 10 and 20. Apparently the species 
is double-brooded in this latitude, for half-grown nymphs have 
been taken as late as August 10. Nymphs in third and fourth 
instars are common up to about July 20; for several days after 
this adults are more plentiful, when again the nymphs become 
common. 
This bug is often found on raspberry and blackberry bushes 
growing in the more or less open places in the woods, such as 
the burned-over area west of Bryant’s Hotel and the partially 
cleared areas on Grapevine Point. Usually it is more abundant 
