FAMILIES OF ORTHOPTERA 9 



d 2 . Head subhorizontal, generally quadrate or gibbous; 

 mouth antero-inf erior ; ocelli often wanting; antennae 

 generally longer than the body and coarse ; pronotum 

 very short ; fore-legs constructed like the others, termin- 

 ating in a pair of claws, the fore femora often arcuate at 

 the base ; anal cerci inarticulate. . . PHASMIDAE. 

 A*. Saltatorial and generally stridulating. Hind femora very 

 much stouter basally, or very much longer, or both, than the 

 middle femora ; organs of flight in a reversed position when im- 

 mature ; head vertical ; ovipositor, with few exceptions, free. 

 ft 1 . Antennae much shorter than the body (with few excep- 

 tions), filiform, clubbed or ensiform, but if the first scarcely 

 tapering, the joints distinct, often depressed ; ocelli three ; tarsi 

 three- jointed, similar in structure on all the legs ; stridulating 

 organs (when present) situated on the hind femora and costal 

 field of the tegmina ; auditory organs (when present) on the 

 basal segment of the abdomen ; ovipositor composed of a dis- 

 crete double pair of short arcuate plates, vertically divergent 



at tip ACRIDIIDAE . 



&' 2 . Antennae much longer than the body, setaceous, delicately 

 tapering; ocelli often wanting; tarsi three- or four- jointed ; 

 stridulating organs (when present) situated on the anal field of 

 the tegmina ; the auditory near the base of the fore tibiae (or 

 rarely on the prosternum) ; ovipositor usually prolonged into a 

 compressed blade or needle, its parts compact. 



c 1 . Ocelli generally wanting ; tarsi four-jointed, nearly similar 

 in structure on all the legs * ; fore coxae usually broader than 

 long t ; middle field of tegmina in repose, like the costal field, 

 nearly or quite vertical ; base of male tegmina (when present) 

 furnished on 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 ensiform blade, 

 the inner valves almost always partially exposed the entire 

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



* In Daihinia the fore and hind tarsi are three-jointed, 

 t Excepting in Stenopelmatinae and Gryllacrinae. 



