THE MOUTH SYSTEM. 389 



9. With many jaws, without the lip closing the mouth, 



(Kleistagnatha). 



10. With many jaws without the lip, covered by palpi, 



(Exoclmata). 



D. 



11. Mouth with a spiral tongue, between reflected palpi 



— butterflies and moths, (Glossata). 



12. Mouth with a rostrum and a jointed sheath — bugs, 



&-C, (Ryngota). 



13. Mouth with a sucker without joints — flies, &c, 



(Jintliata). 



Cuvierh Classification. 



I. Insects with Jaws. 



1. Without wings — crabs, spiders (Gnathoptera). 



2. With four equal wings — dragon-flies,&c,fJV*eitr- 



optera). 



3. With four unequal wings — bees, wasps (Hymen- 



optera). 



4. With wing-cases — beetles (Coleoptera). 



5. With four straight wings — crickets, &c, ('Or- 



thopiera). 



II. Insects without Jaws. 



1. With upper wings of unequal consistence — 



bugs, &c, (HemipUra). 



2. With powdery wings — butterflies and moths 



(Lepidoptera). 



3. With two wings — flies, &c, (Diptera). 



4. Without wings — fleas, mites, &c, (Optera). 



LamarcWs Classification. 



I. Insects with Jaws. 



1. With wing-cases — beetles (Coleoptera). 



2. With straight-wings — crickets, &c, ( Orthoptera). 



3. With four equal wings — dragon-flies (JVeurop- 



tera). 



II. Insects with Jaws and a sort of Sucker. 



4. With four unequal wings — bees, &c, (Hymen- 



optera). 

 VOL. XII. 34* 



