Lazvrence Briiner 



of insect cylindrical. Antennae variable, but not typically 

 setaceous as in the two following suborders. 



Suborder Gryllotalpoidea. 

 cc. Antennae much longer than the body, setaceous, delicately taper- 

 ing. Stridulating organs, when present, situated on the anal 

 field of the tegmina. Auditory apparatus ■ situated near the 

 base of the front tibiae. Ovipositor usually prolonged into 

 a compressed blade or needle, its parts compact. 

 d. Ocelli variable. Tarsi three-jointed, those of the front legs 

 or else of the hind legs differing from the others in struc- 

 ture. The middle field of the tegmina in repose, like the 

 anal field, nearly or quite horizontal; male tegmina (when 

 present) furnished on the dorsal surface with a tympa- 

 num (very rarely absent) extending across both the anal 

 and median areas, crossed by a prominent nervure formed 

 by the main anal vein, and as a whole broader than the 

 rest of the tegmen. Ovipositor (unless, as rarely, con- 

 cealed) forming a nearly cylindrical straight or occasion- 

 ally upcurved needle, the inner valves generally scarcely 

 exposed except at the expanded tip. 



Suborder Achetoidea, 

 dd. Ocelli generally wanting. Tarsi nearly always four- jointed, 

 very similar in structure on all the legs. Middle field of 

 tegmina in repose, like the costal field, nearly or quite 

 vertical; base of the male tegmina (when present) fur- 

 nished on the dorsal surface with a tympanum limited to 

 the anal area, crossed by a prominent nervure formed by 

 the last branch of the anal vein, and as a whole narrower 

 than the rest of the tegmen. Ovipositor (unless, as rarely, 

 concealed) forming a strongly compressed, generally ensi- 

 form blade, the inner valves almost always partially exposed 

 the entire length of the ovipositor, the tip not expanded. 



Suborder Tettigonoidea. 

 bh. Posterior legs similar to the others, not constructed for jumping. 

 Tarsi three-jointed. Organs of flight (when present) in a normal 

 position. Ovipositor concealed by the subgenital plate. 



Order Dermaptera. 

 c. Always apterous. Parasitic on mammals. 



d. Eyes much reduced. Mandibles strongly flattened, not adapted 

 to mastication, but the inner margin densely clothed with 

 bristles. Cerci feebly chitinized, forming incipient forceps. 

 Maxilla with thef inner lobe furnished with two apical 



teeth [Malayan Archipelago] Suborder Arixenia. 



dd. Eyes absent. Mandibles normal. Cerci non-segmented, feebly 



198 



