ORTHOPTERA OP INDIANA. 167 



A DESCEIPTIVE CATALOGUE OF THE OETHOPTERA 

 KNOWN TO OCCUR m INDIANA. 



The order Ortlwptera may be subdivided into two classes or sub- 

 orders, which in turn are subdivided into seven families. The sub- 

 orders may be distinguished by the following table: 



KEY TO SUB-ORDEKS OF ORTHOPTERA. 



a. Legs of equal or nearly equal size, the hind femora not being en- 

 larged for leaping. Organs for producing sound absent. Tegmina 

 and wings of nymphs, when present, in a normal position. Ovi- 

 positor concealed by the sub-gonital plate. . Non-Salt atoria, p. 167 

 aa. Legs of unequal size, the hind femora fitted for leaping, being much 

 thicliened and swollen, and usually much longer than the middle 

 femora. Organs for producing sound usually present. Tegmina 

 and wings of nymphs, when present, in a reversed position. Ovi- 

 positor usually exserted so as to be plainly visible 



Saltatoria, p. 210 



NON-SALT ATORIA. 



To this class or sub-order belong four of the seven recognized 

 families of Orthoptera. These may be distinguished one from an- 

 other by the following table: 



KEY TO FAMILIES OF NON-SALTATORIAL ORTHOPTERA. 



a. Body short, narrow, more or less flattened. Head horizontal, the 

 mouth in front. Tegmina leatheiy, very short, without veins; meet- 

 ing in a straight line down the bacli. Tarsi three-jointed, without 

 pulvilli or pads. Abdomen of both sexes terminating in horny 



forceps-like appendages Forficulid.e, p. 168 



aa. Body either short and wide, or elongate and narrow. The mouth at 

 either lower or baclv portion of head (depending upon the position 

 of the latter when at rest). Tegmina usually parchment like, 

 thickly veined. Tarsi five-jointed. Abdomen terminating in cerci, 

 but these never distinctly forceps-like. 



1). Body short, broad, oval, depressed. Head almost wholly con- 

 cealed beneath the pronotum; the mouth posterior (at back 

 portion when at rest). Ocelli generally two. Pronotum 

 shield shaped, transverse. Legs compressed. Insects of 



rapid motion. Blattid.e, p. 172 



bb. Body elongate, narrow. Head, free, not covered by pronotum; 

 the latter longer than broad. Ocelli three or wanting. Legs 

 slender, not compressed. Insects of slow motion. 

 c. Head oblique; mouth inferior. Ocelli three. Antennoe 

 short. Pronotum generally longer than any other 

 segment. Front pair of legs, raptorial, fitted for grasp- 

 ing. Cerci jointed Mantid^, p. 198 



