30 



is also found on CJirysopsis, Kuhnia, Ambrosia psilostachya, Lcspe- 

 dena capitata, and grasses. The winter is passed in sheltered places. 

 In April it has been taken crawling about on sand, and also under 

 cactus lobes and boards. It is a typical bunch-grass species. 



Peribalus limbolarius Stal. October 7, April i, 4. 



One of our commonest and most generally distributed pentatom- 

 ids. It is a plant eater. Found on Kuhnia m the bunch-grass, and 

 under logs and cactus lobes in April. Much less common in the sand 

 than in open areas of different soil type. 



Perillus circumcinctns Stal. July 8. 



This pentatomid is found in the sand regions on Rhus canadensis 

 illinoensis. Hart found it very abundant in former years, but in 

 1910 only one specimen was seen. John B. Smith reports it as be- 

 ing predaceous upon beetle larv?e. The members of this subfamily 

 feed upon chrysomelid larvae. Blcpharida rhois, a chiysomelid, usu- 

 ally abundant on RJius also, has a larva which feeds on the leaves. 

 It is therefore quite probable that Perillus preys upon the larvae of 

 Blepharida. The fact that Blcpharida was also rare in 1910 (none 

 being seen) would seem to confirm this inference. Perillus has a 

 very wide range — Nebraska, Missouri, Canada, Dakota, New Eng- 

 land, Panama, and the island of Trinidad (Uhler). Other species 

 of the genus are found in the Southwest and in Mexico. 



Cydnus obliquus Uhl. April 8. 



This insect and others of the same family are commonly found 

 in sand or mud banks. The legs are formed for digging. The spe- 

 cies ranges from the Rocky Mountains to the Atlantic coast. Two 

 specimens taken crawling on the sand in open bunch-grass at the 

 Devil's Hole. Hart took one specimen at the Devil's Neck. 



Sehirus cinctus Beauv. April 8. 



This genus is represented by a single widely distributed species. 

 One specimen was taken crawling about on the sand. Hart took 

 one specimen at the Devil's Hole on Monarda punctata. The cyd- 

 nids hibernate as adults, probably burrowing in the sand. 



Thyreocoris ciliata Uhler {Corimelaena White). June 25, October 8. 

 A western "negro bug." Very abundant on Cassia in blowsand, 

 and about the roots of blowsand plants. Found on interstitial plants 

 in the bunch-grass. At times they were fairly swarming on the Cas- 

 sia. One of the distinctive blowsand animals. Not found in Illinois 

 except in sand regions. 



