48 IOWA STUDIES IN NATURAL HISTORY 
fourth instars are common in open places in the woods on 
high, dry, sandy ground and also along the edges of woods 
north of North Fishtail Bay. Adults are also fairly common, 
but many of them are yet soft, indicating that the insects have 
but recently molted for the last time.’’ The high, grassy hills 
south of Camp Davis offer excellent habitats for this bug, part- 
icularly during July. 
However, not always were specimens taken in such arid sit- 
uations for numerous examples are at hand from the vicinity 
of Smith’s Bog, Bessey Creek near Ingleside and the small 
streams which flow into North Fishtail Bay. 
Considerable variation in both size and coloration obtains in 
my specimens. The females average much larger and are more 
distinctly marked than the males, although one male in the 
collection is as distinctly marmorate as the best marked female. 
Curiously enough, the closely allied species H. bijugis was 
not taken in the region, although northern Michigan is within 
its recorded range. It may be distinguished from H. aeneifrons 
by the yellowish marginal or submarginal line on the head, the 
rounded instead of angular anterior prolongation of the 6th 
visible ventral segment, the generally paler color and the slight- 
ly smaller size. 
Subfamily Odontotarsinz 
Eurygaster alternatus (Say) 
This seutellerid is also very common in open, dry grassy sit- 
uations in the region, particularly on the higher ground. 
Nymphs far outnumber adults until the middle of July. My 
earliest record for an adult is June 29. On July 2, 1919, great 
numbers of nymphs in all stages were taken along the engineers’ 
base line south of the Biological Station, while but two adults 
fell to our nets on this date. 
The usual variation in size and color is exhibited by the 
specimens at hand. However, one of these, a female taken on 
July 17, is unique in having the scutellum, hemelytra and pro- 
notum a uniform brick red in color with a round black dot at 
each humeral angle. In addition, the alternations on the con- 
nexivum are almost obsolete. Another specimen, a female taken 
