174 Illinois State Laboratory of Natural History. 



and for avoiding its enemies. It is said to puncture and destroy 

 the eggs of fishes. Its own eggs are elongated and are provided 

 with two long filaments at one end. 



Family Notokectid^^. (Water Boatmen.) 



Notoneda undulata, Say. 



(Say, Heteropterous Hemiptera, 1831, 39 ; Cora pi. Writ., i, 

 368.) 



An active, predaceous insect, capable of inflicting a severe 

 sting with its beak when handled incautiously. The eggs, 

 which are elongated, cylindrical, and white, are attached to 

 aquatic plants. The young have been observed to emerge in May. 



Taken in Quincy on Cedar Creek. 



Plea striola, Fieber. 



(Uhler, Stand. Nat. Hist., ii, 253.) 



A minute, brown, hard-bodied species, which is quite com- 

 mon in many streams in Illinois. 



Taken only in Willow Slough. Not common. 



Family CoRisiDiE. 



Corisa signata, Fieber. 



(Fieber, Abhandl. Kon. Bohm. Gesell. Wiss., 1852, 283.) 

 This small species was extremely abundant in the tempo- 

 rary pools, especially so in Wood Slough. 



Corisa alfernata, Say. 



(Say, Jour. Acad. Nat. Sci. Phil., N. Ser., iv, 329, 1825; 

 Compl. Writ., ii, 251.) 



This is the commonest Illinois Corisa. It was less abund- 

 ant in some of the Quincy pools than the preceding, but was 

 more widely distributed. Noted especially in Cedar Creek and 

 Long Lake. The eggs are oval and have a small prominence at 

 the free extremity. They are attached generally to plauts. 



ORDER ORTHOPTERA. (Crickets and Grasshoppers.) 



This is a strictly terrestrial group, and calls for mention 

 here only because of the constant presence, on the banks of 

 streams and pools, of species belonging to it, which doubtless 



