188 



ON SYSTEMATIC ZOOLOGY. 



Div. I. AL4TA. (Ptilota Aristotle.) 



r 1- 



I. 



Wings covered with scales, tongue 

 Wings four, tongue and 



III. 



DlPTERA. 



Two wings 

 uncovered. 



Gymnoptera. 

 Four wings, - 

 witliout wing' 

 cases. 



II. 

 Vaginata. 

 Two wings, 

 covered by 

 two wing- 

 cases. 



I 



IV. 



Saltatoria. 

 Undergoing 

 a metamor- 

 phosis. 



V. 



Gressoria, 

 Undergoing 

 no metamor- 

 phosis. 



Lepidoptera. 

 spiral. 



2. Elinguia. (Neuroptera L.) 

 teeth none. (Trichoptera K.) 



3. Neuroptera. Wings membranaceous, equal reticu. 

 lated ; mouth furnished with teeth. 



i. Hymenoptera. Wings membranaceous, unequal ; 

 nervures mostly longitudinal; mouth with teeth. Fe. 

 male witli a sting. 



5. SiPHoNATA. (Hemiptera i.) 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 i.) Wings two, membrana- 

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

 teeth. 



10. Proboscidea. (Hemiptera i.) Wings two, mem- 

 branaceous. Male without either poisers, tongue, or 

 teeth. Female apterous, with a tongue in the breast 



Div. IL Aptera. (Aptera i.) 



11. SucTORiA. Wings none ; feet six ; mouth with a 

 proboscis. {Pulex L.) 



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

 distinct. {Hexapod Aptera, Vermes, Psocus.) 



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

 united with the trunk, (Octopod Aptera, Arachnids, 

 Crustacea.) 



14. Crustacea. Wing* none; feet fourteen or; more ; 

 heart separated from the thorax. ,_ {Potypod 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. 



