20 



Tettiv ornatus Say. April 8. 



A member of the subfamily Tettigiuae or grouse locusts. The 

 food is mainly vegetable. Most of the grouse locusts are of northerly 

 distribution. Found at the bottom of a hollow in the bunch-grass. 

 Terricolous. The peculiar life history of the grouse locusts (they 

 hibernate as adults) may possibly be an adaptation to conditions in 

 the north, where the grownng season is shorter. It may also remove 

 them from competition with the more dominant locusts, which are 

 most active later in the season. This species is not typical of bunch- 

 grass. 



Tettix hancocki Morse. April 4, 8. 



Found in the bunch-grass, and with the preceding species. Much 

 more abundant in the sand prairie, though still not a typical species. 

 Of northerly distribution. 



Mermiria hivittata Serv. July 6, 19, October 8. 



Like the other members of the subfamily Tryxalinae, this spe- 

 cies is herbicolous (living much of the time upon plants) and flies 

 strongly. Found in the Devil's Hole, usually in the longest and driest 

 grass. It is probably never found in bare sand. A typical bunch- 

 grass species, of western distribution. 



Mcriiiiria neomexicana Thom. July 29. 



Habits and local distribution similar to those of the preceding 

 species. It is more restricted to the western regions, is smaller, and 

 not so commonly found in the Illinois sand regions. Hart's record 

 is the first for Illinois. 



Syrbiila admirabilis Uhl. 



This species, quite common in the drier parts of Illinois, was not 

 taken at Havana, probably for the reason that it is abundant at a 

 time of year when no collecting was done. Mr. Hart found it in the 

 sand regions in the middle of August. 



Britettix sp. (undescribed). April i, 8. 



Thought by Mr. Hart to be a new species. (Cf. Hart and Glea- 

 son, '07: 231, 259.) Nymphs common in bunch-grass at the Devil's 

 Hole in spring. The eggs probably hatch very early in the season, as 

 the specimens found were too small to have wintered as nymphs. 



Ageneotettix deorum Scudder. July 19, October 8. 



Taken as early as July 6. The habits are more like those of the 

 Acridiinae, as it depends less upon its wings and more upon its power 

 of leaping. It has also a terricolous tendency. It is a western spe- 



