Bruner: South American Crickets. 345 



e. Body oval, depressed, much broader than deep at the posterior 

 extremity of the prothorax. Head nearly horizontal and 

 wholly, or almost wholly, concealed beneath the proiiotum, the 

 mouth posterior, or infero-posterior, when at rest ; ocelli generally 

 two in number. Pronotum c^'peate, usually transverse. Legs 

 depressed, rather lengthily and numerously spined. Insects 

 of rapid movements. Ootheca chitinized, usually carried by 



parent Order Dictyoptera, or Blattaria. 



ee. Body elongate, generally narrow, even when depressed or ex- 

 panded but httle broader than deep at the posterior extremity 

 of the prothorax. Head free, often separated from the pro- 

 thorax by a deep constriction; ocelli three or wanting. Pro- 

 notum never transverse, except occasionally by laminate ex- 

 pansions. Legs rarely depressed, the front pair constructed 

 for grasping. Insects of deliberate movements. Ootheca 

 membranous, not carried by parent, but attached to twigs, 



bark, or other objects Order Mantaria. 



dd. Eggs not contained in a capsule or ootheca. Insects social. Fre- 

 quently constructing large and complicated nests. Species rep- 

 resented by males, females, workers, and warriors. 



Order Isoptera. 



bb. Cerci not segmented or jointed. Body normally elongate, narrow. Head 



subhorizontal, generally quadrate or gibbous; mouth antero-inferior; 



ocelli often wanting; antennae usually longer than the body and coarse 



Pronotum very short. Legs all constructed for walking. Eggs dropped 



singly and indiscriminately Order Gressoria. 



A A. Tarsi normally four- or three-jointed, very rarely two-jointed. Stridulating 

 organs and auditory apparatus often present. 

 b. Posterior legs constructed for jumping, much more robust and longer than 

 the others. Organs of flight in a reversed position when immature. 

 Head vertical, ovipositor with a few exceptions free or exserted. 



Order Salt.\toria. 



c. Antennae generally much shorter than the bodj', filiform, clubbed or 



ensiform, the joints distinct, often depressed. Ocelli two or three. 



Tarsi three-jointed. 



d. Anterior legs constructed for walking or clinging to vegetation, not 



fitted for burrowing. Tarsi similar in structure on all the legs. 



Stridulating organs located on the hind femora and costal field of 



front wings. Auditory apparatus situated on the sides of the basal 



abdominal segment. Ovipositor composed of four horny plates 



divergent at tip Suborder Locustoidea. 



dd. Anterior legs greatly modified for burrowing in the earth. Tarsi of 

 the front pair of legs differing from those of the other pairs. Strid- 

 ulating organs located on the tegmina or front wings. Auditory 

 apparatus, when present, confined to the anterior tibiae. Ovi- 

 positor not exserted. Body of insect cylindrical. Antennae 

 variable, but not typically setaceous, as in the two following sub- 

 orders Suborder Gyrllotalpoidea. 



