8 GUIDE TO ORTHOPTERA 



Families of Orthoptera. 



A 1 . Non-saltatorial and mute. Hind femora closely resembling 

 those of the other legs, and scarcely if at all stouter or longer 

 than the middle femora; organs of flight in a normal position 

 when immature ; ovipositor concealed by the subgenital plate. 

 5 1 . Mouth anterior; tarsi with not more than three joints; anal 

 area of wings (when present) extending around the apex over 

 more than half the front border of the wings ; abdomen termin- 

 ated in both sexes by forcipate appendages. FORFICULIDAE. 

 # 2 . Mouth posterior, inferior, or at most antero-inferior ; tarsi 

 five-jointed * ; anal area of the wing never infringing on the 

 front border ; abdominal appendages not distinctly forcipate. 

 c 1 . 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 pro- 

 notum, the mouth posterior or infero-posterior when at rest ; 

 ocelli generally two in number ; pronotum clypeate, generally 

 transverse ; legs depressed. Insects of rapid movement. 



BLATTIDAE' 



c 2 . Body elongate, generally narrow, even when depressed or 

 expanded generally but little broader than deep at the poste- 

 rior extremity of the prothorax ; head free, often separated 

 from the prothorax by a deep constriction; ocelli three or 

 wanting ; pronotum never transverse, except occasionally by 

 laminate expansions; legs rarely depressed. Insects of 

 deliberative movement. 



d 1 . Head oblique, generally trigonal; mouth inferior or 

 infero-posterior ; ocelli three ; antennae rarely as long as the 

 body, generally slender; pronotum generally longer than 

 any other segment ; fore-legs raptorial, terminating in a 

 single claw, which with the tarsi is placed beneath the 

 spinous tibiae when at rest; anal cerci articulated. 



MANTIDAE. 



* Occasionally a joint is absent, probably by accidental loss of the leg in early life, 

 since in the reproduction of lost limbs one tarsal joint always disappears. 



