(§, 321. THE INSECTA. 399 



C. Insects with complete Metamorphosis. 



[Insecta holometabola.) 



1. Mouth Suctorial. 



a. Two wings. Under lip changed into a suctorial organ. 



ORDER IV. DIPTERA. 



Families : Pulicidae, Nycteribidae, Hippoboscidae, Muscidae, Oestridae, 

 Syrphidae, Conopidae, Stomoxydae, Bombylidae, Anthracidae, Lep- 

 tidae, Henopidae, Asilidae, Stratiomydae, Tabanidae, Tipulidae, 



CuLtCIDAE. 



b. Four scaly wings. Maxillae changed into a suctorial organ. 



ORDER V. LEPIDOPTERA. 



Families : Tineidae, Pyralidae, Geometridae, Noctuidae, Bombycidae, 

 Hepiolidae, Zygaenidae, Sphingidae, Papilionidae. 



0. Four naked wings. Tongue changed into a suctorial organ. 



ORDER VI. HYMENOPTERA. 



Families : Apidae, Andrenidae, Vespidae, Formicidae, Scoliadae, 



MUTILLIDAE, POMPILIDAE, CrABONIDAE, BeMBECIDAE, ChRYSIDIDAE, 



Cynipidae, Ichneumonidae, Siricidae, Tenthredinidae. 

 2. Mouth Mandibulate. 

 a. Two posterior wings only. 



ORDER VII. STREPSIPTERA. 



h. Four membranous wings. 



ORDER VIU. NEUROPTERA. 



Families : Piiryqanidae, Sialidae, Hemerobidae, Myrmeleonidae, 

 Rhaphidiadae, Panorpidae, Mantispidae. 



c. Two upper wings corneous, and two under membranous. 



ORDER IX. COLEOPTERA. 



Families : Pselaphidae, Coccinellidae, Chrysomelidae, Cerambycidae, 

 Curculionidae, Cistelidae, Meloidae, Tenebrionidae, Pyrochroidae, 

 Elateridae, Lamellicornes, Clavicornes, Hydrophilidae, Hydrocan- 



THARI, StaPHYLINIDAE, CaRABIDAE. 



