188 



GYMPJOPTERA. 

 Four wings, 

 without wing- 



ON SYSTEMATIC ZOOLOGY. 

 ' Div. I. ALATA. (Ptilota Aristotle.} 



Wings covered with scales, tongue 

 tongue and 



VAGINATA. 



Two wings, 

 covered by 

 two wing- 

 cases. 



III. 



DlPTERA. 



Two wings 

 uncovered. 



IV. 



SALTATORIA. 

 Undergoing 

 a metamor- 

 phosis. 



V. 



GRESSORIA. 

 Undergoing 

 no metamor- 

 phosis. 



f 1. LEPIDOPTERA. 

 spiral. 



2. ELINGUIA. (Neuroptera L.) Wines 

 teeth none. (Trichoptera K.) 



3. NEUROPTERA. Wings membranaceous, equal reticu- 

 lated ; mouth furnished with teeth. 



4. HYMENOPTERA. Wings membranaceous, unequal : 

 nervures mostly longitudinal ; mouth with teeth Fe- 

 male wjth a sting. 



5. SIPHONATA. (Hemiptera L.) Wings membranaceous ; 

 tongue bent under the breast. (Homopetra Leach.) 



6. DERMAPTERA. (Hemiptera L.) Elytra half mem- 

 branaceous, half coriaceous, crossed. A pair of mem- 

 branous wings, tongue bent under the breast. 



7. HEMIPTERA. Elytra coriaceous, or semi-crustaceous, 

 aliform ; a pair of membranous wings : mouth with 

 teeth. (Orthoptera Lat.) 



8. COLEOPTERA. Wings hard and crustaceous, with a 

 pair of membranous wings beneath : mouth furnished 

 with teeth. 



9. HALTERATA. (Diptera L.) Wings two, membrana- 

 ceous ; poisers two ; mouth with a tongue, but without 

 teeth. 



10. PROBOSCIDEA. (Hemiptera L.) Wings two, mem- 

 branaceous. Male without either poisers, tongue, or 

 teeth. Female apterous, with a tongue in the breast. 



Div. II. APTERA. (Aptera L.) 



SUCTORIA. Win 

 proboscis. (Pule 



11. SUCTORIA. Wings none : feet six : mouth with a 

 ? '" -Ml*) 



12. AUCENATA. Wings none ; feet six ; head and thorax 

 distinct. (Hexapod Aptera, Termes, Psocus.) 



13. ATRACHELIA. Wings none ; feet six or more ; head 

 united with the trunk. (Octopod Aptera, Arachnidce, 

 Crustacea.) 



14. CRUSTACEA. Wings none ; feet fourteen or; more ; 

 head separated from the thorax. j_ (Polypod Aptera, 

 Crustacea.) 



(240.) It has been well observed on this system, that 

 this great naturalist, whose merits repose on a much 

 more permanent basis than mere classification, by 

 following too strictly the number and substance of the 

 organs of flight, has been led to place in different classes 

 insects which ought not to have been so separated.* 

 He appears, nevertheless, to have been convinced of the 

 propriety of Aristotle's primary divisions of winged and 



* Int to Ent. voL iv. p. 443. 



