FAMILY III. 



(Burmeister.) 

 Orthoptera Epizoica (Nitzsch). Nirmidae (Leach.} 



ESSENTIAL CHARACTER. 



Antennae capitate, four jointed ; maxillary palpi conspi- 

 cuous ; mouth with strong mandibles. 



NATURAL CHARACTER. 



Mouth beneath, very near to the anterior margin ; man- 

 dibles strong, armed at the end with two teeth ; antennae 

 inserted in a cavity of the lateral margin ; thorax of two or 

 three segments; prothorax with the lateral margins protruding 

 more or less, nearly the width of the head ; mesothorax ge- 

 nerally small, in some cases as wide as the head ; metathorax 

 large, the width of the abdomen ; abdomen with nine or 

 ten segments ; oesophagus symmetrical, equal, slightly uni- 

 lateral ; biliary vessels four, free, thickened in the middle ; 

 males with three testicles on each side ; females with three 

 ovaries on each side : Coitus exercetur femina mari sub- 

 missa. Metamorphosis indistinct. 



ARTIFICIAL DIVISIONS OF THE FAMILY. 



GENUS. SUB-GENUS. 



r I. Colpocephalum. 

 II. Menopon. 

 III. Nitzschia. 

 IV., Tririoton. 

 V. Eureum. 

 VI. Laemobothrium. 



I. Tarsi with} T T 



J I. LIOTHEUM. 

 two claws. 5 



_VII. Physostomum. 



II. Tarsi with . TT 



( II. GYROPUS. 

 one claw. S 



