OKTHOPTEEA OF INDIANA. 217 



body. It is found on many species. Among insect pests^, ants and 

 bugs are sometimes deadly to them. In a wet ditch in June the 

 writer found a number of small dark-brown ants dragging along the 

 ground a female Teftix ornatus which had just been killed by them. 

 When endeavoring to capture some Tetiix at the same place my at- 

 tention was drawn to a colony of those ants acting in a panicky state 

 of excitement, the cause of this being that they had darted upon the 

 insect the author was pursuing, tumbling it over and biting it sav- 

 agely about the neck. The little loctist finally escaped by a vigorous 

 jump. 



"According to P. R. Uhler, Galgulus ocuJatus, a true bug, is a seri- 

 ous enemy. 'This insect may often be seen/ says Uhler^, "^in the month 

 of May walking about between the stones on the low banks of brooks 

 and streams, where Tdtix and Paratettix abound, watching an oppor- 

 tunity to seize one of these insects, and when the favorable moment 

 arrives, leaping suddenly upon one of them, clasping it with tight 

 embrace between the front femora and tibise and then sucking out its 

 vital juices.' " 



Toads, fishes and birds also feed upon them when opportunity 

 offers. 



Nine genera, 45 species and numerous varieties of these grouse 

 locusts are described from the United States in the latest monograph 

 of the group.* Of these 13 species, representing five genera, have 

 been taken in Indiana. The genera found in the State may be sepa- 

 rated by the following table: 



KEY TO C4ENERA OF INDIANA TETTIGINiE. 



a. Anteuupe with 12 to 14 joints; front femora more or less compressed, 

 carinate above. 



&. Vertex of lieacl extending beyond the front of eyes, wider than 

 one of them; its front angulate or rounded, not truncate. 

 c. Front dorsal margin of pronotum when truncate not ad- 

 vanced upon the head to the eyes; facial ridges not 

 for Iced; front of vertex, when viewed from the side, an- 

 gulate or sub-rounded. 



d. Pronotum with its median carina raised in the form 

 of a crest and more or less arched lengthwise; the 

 front margin produced in an angle over the back 

 of the head. Upper notch or sinus on the hind 

 margin of lateral lobe of pronotum shallow, about 



one-half as deep as the lower 



XII. NOMOTETTIX, p. 218 



•■■"The Tettigida; of North America," by Dr. J. L. Hancock, Chicago, 1902. 

 44-Geol. 



