90 AN INTRODUCTION TO ENTOMOLOGY. 



margin; tarsi three jointed, the pulvillus wanting; cerci horn 

 bl ing forceps. i. F 



BB. Anterior wings parchment-like, thickly veined; posterior wings folded 

 to the base; tarsi five-jointed ; cerci soft, jointed or without joints. 

 C. Body oval, depressed ; head wholly or almost wholly withdrawn bet 

 the pronotum; pronotuin shield-like, transverse; legs com; 

 cerci jointed; rapidly running insects. 2. HI.AI 



CC. Body elongated; head free; pronotum elongated; legs 

 rounded; cerci jointed or without joints ; walking insects. 

 D. Front legs fitted for grasping; cerci jointed. 3, M \N 



DD. Front legs simple; cerci without joints. 4. I'HAS.MID.K. 



AA. Posterior femora fitted for jumping, i.e., very much stouter or very much 

 longer, or both stouter and longer than the middle femora; ovipositor horny, 

 free (except with the mole crickets); organs of flight of immature forms 

 inverted; stridulating insects. 



B. Antennae short; tarsi three-jointed ; supposed organs of hearing situated 

 in the first abdominal segment; ovipositor short, composed of fu: 

 arate plates; stridulating organs situated in hind femora and the 

 area of the tegmina. 5. ALKII 



BB. Antennas long, setaceous ; tarsi four- or three-jointed ; supposed organs 

 of hearing situated in the anterior tibiae and also in the prosternum ; ->\ i 

 positor elongated (except in the mole crickets) ; composed of four connate 

 plates. 



C. Tarsi four-jointed ; ovipositor (when exserted) forming a strongly com- 

 pressed, generally sword-shaped blade; the stridulating organs of male 

 limited to the anal area of the tegmina. 6. Locus i m.K. 



CC. Tarsi three-jointed; ovipositor (when exserted) forming a nearly 

 cylindrical, straight, or occasionally upcurved needle; the stridulating 

 organs of the male extend across the anal and median areas of the teg- 

 mina. 7. GRYLLID^. 



Family I. FORFICULID^E.* 

 (Earwigs.) 



This family includes only the earwigs. With these insects the 

 first pair of wings are leathery, very small, 

 without vt iiis, and when at rest meet in a 

 straight line down the back, partially cov- 

 ering the second pair of wings. T! 

 wing-covers strongly resemble those of the 

 The second pair of wings 



FIG. 84^ Winr of Earwig. differ from those of other Orthoptera < I ; ig. 

 84). They are furnished with radiating veins 

 which extend from a point near the end of the basal third of the 



* Forficfllida : forflcula % a pair of small shears. 



