114 ARTHROPODA. 



It is very unfortunate that locusts should not have been retained 

 under the old Latin name of Locusta ; but the nomenclature here 

 given is now universally adopted. 



Thysanura and Collembola have been placed in this order. 



With it also have been combined Dragonflies and other Neu- 

 roptera, the so-called incomplete metamorphosis being the only 

 character in common. Perhaps it would be more convenient to 

 unite the two; naturally they appear to include ten distinct 

 groups. 



Of the four suborders of Orthoptera, Euplexoptera [=Der- 

 maptera] is so far differentiated that Westwood considers it en- 

 titled to ordinal rank. Blattidas has also been elevated into an 

 order [Dictyoptera] by Leach. They are both included in the 

 Cursoria by Glaus. 



Anal segment without a forceps. 

 Hind legs formed for walking. 



Head retracted CURSORIA. 



Head exserted GRESSOKIA. 



Hind legs formed for leaping SALTATORIA. 



Anal segment with a movable forceps . . . EUPLEXOPTERA. 



CURSORIA. Body ovate, depressed. Head retracted into the 

 prothorax. Legs slender; tarsi with an accessory joint [plan- 

 tula] between the claws. 



The antennae are generally very long and slender. The upper 

 wings are coriaceous, the lower longitudinally folded ; but they 

 are not often developed in the female, and not always in the 

 male. 



These insects are mostly nocturnal, and are vegetable feeders, 

 but many are omnivorous. 



Blattidce. Blatta. Gynopeltis. 



Polyzosteria. Thyrsocera. Euthyrhapha. 



Perisphreria. Periplaneta (Cock- Panesthia. 



Heterogamia. roach). Hormetica. 



Corydia. Panchlora. Blabera. 



Phoraspis. Derocalymma. Monachoda. 



GRESSORIA. Body long, narrow. Head exserted. Legs slender; 

 posterior femora not thickened. 



In the Mantidse the anterior legs are raptorial and their femora 

 grooved beneath for the reception of the tibiae in repose. The 

 prothorax is by far the longest of the thoracic segments ; in the 

 Phasrnidffi it is the shortest. Both families are remarkable in 



