ola county, is situated on a low, flat, prairie country with char- 

 acteristic flora. There are few trees except cottonwoods and 

 willows. However, it was not on this wild, unbroken prairie 

 that pentatomids seemed most abundant but along the margins 

 of cultivated fields and roadsides, where semi-cultivated areas 

 are the rule. Few of the pentatomids seemed to be attracted by 

 the wild prairie flowers and plants, at least during July, and 

 most were taken from the cultivated ones such as blue grass, 

 timothy, red clover, etc. 



Toward the latter part of July, part, of a day was spent in col- 

 lecting southeast of Sioux City in the vicinity of Sargents Bluff. 

 Here again it was demonstrated that at this season of the year 

 at least, few pentatomids were to be found on the hills and high 

 prairies that had never been under cultivation. Bett-er results 

 were obtained in the semi-cultivated orchards and fields and 

 along roadsides. 



Family SCUTELLEEID^ 

 Subfamilr Tetyrinse 



Homcemu^ ceneifrons Say. During tlie summer but two specimens 

 which can with certainty be placed, in this species were taken. Two other 

 specimens collected by M. P. Somes at Rock Eapids in September, 1914, 

 are also referable to the present species which appears to be much less 

 common than the following. Specimens are at hand from Lake Okoboji, 

 Estherville, and Eock Eapids. 



JELomwmus dijugis Uhler. One hundred and fifty-five specimens of this 

 form were taken mostly from prairie and blue grass pastures along the 

 edges of woods. Of this lot twenty-two are nymphs most of which were 

 taken in June although a few half-grown ones were taken as late as Au- 

 gast 16. Next to CosmopepJa Mmaculata this was the most abundant 

 species of pentatomid found in the region. The adults became more and 

 more evident as the season advanced until in the latter half of July and 

 during August they reached the maximum of abundance. The species is 

 represented by specimens from Lake Okoboji, Sibley, Estherville, Emmets- 

 burg, Granite, and Silver Lake. 



Subfamily Odontotarsinse 



Eurygaster aJtertiatus Say. This species was taken only on low swampy 

 prairie and roadsides grown up in timothy and blue grass at Lake Okoboji, 

 Sibley, and Emmetsburg. It is represented by four specimens two of 

 which are nymphs taken in July. 



Family CYDNID^ 

 Subfamily Thyreocorinee 

 Tliyreocaris ater A. and S. Several specimens of this species were taken 

 on the weeds and grass along the margins of both Spirit and West Okoboji 

 lakes. 



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