SCUTELLEROIDEA OF IOWA 83 
among the males. The extent of the rufous on the fourth anten- 
nal segment also varies considerably, some specimens showing 
only a little at the base of the segment while in others more 
than half of the segment is rufous. Some specimens show only 
a trace of the dusky spots on hemelytra and scutellum but oth- 
ers, particularly the lighter colored ones, show this character 
plainly. 
This is one of our common representatives of the genus and 
many specimens are at hand from Ames, Decorah, Independence, 
Iowa City, Lake Okoboji, Osage, Robinson, Silver Lake, Sioux 
City, Homestead and Solon. The adult specimens bear collect- 
ing dates ranging from March 11 to November 13 with the 
greatest number taken in August while the number taken in 
July runs somewhat behind. Nymphs have been taken mostly in 
July and August and in favorite habitats are often abundant at 
that season. 
Ordinarily this bug is found in or along more or less wooded 
and shady places and moist situations grown up in rank weeds 
and bushes. At Lake Okoboji it is one of the commonest wood- 
land forms and occurs most frequently on wild black raspberry 
(Rubus occidentalis Linn.) on which plant numerous examples 
have also been taken in other parts of the state. Sometimes it 
occurs on wild red raspberry (Rubus idaeus Linn. var. aculeat- 
issimus (C. A. Mey) R. and I.) and not infrequently are speci- 
mens found on the cultivated plants in our gardens. In late 
summer the species is also found on hazelnut bushes (Corylus 
americana Walt.). Adults are often found hibernating under 
leaves in the vicinity of clumps of such bushes. 
Euschistus tristigmus var. pyrrhocerus Herrich-Schaeffer (PLATE 
VI, Ficure 6) 
1842. Cimex pyrrhocerus Herrich-Schaeffer, Wanz. Ins., VI, 71, fig. 638. 
1904. Euschistus tristigmus var. pyrrhocerus Van Duzee, Trans. Am. Ent. Soc., 
XXX, 47. 
1916. Euschistus tristigmus var. pyrrhocerus Stoner, Ent. News, XXVII, 182. 
Closely allied and very similar to EH. tristigmus but the general form 
narrower and more elongate, thus giving the insect a trim appearance. 
The punctuation above is a little finer and the irregular calloused spots 
more pronounced. Antennae averaging a little paler than in EL. tristigmus 
and with the two apical segments little or not at all darker than the other 
segments. Antero-lateral angles of the pronotum more concavely arcuated 
