144 



ZOOLOGICAL PHILOSOPHY 



(B) Biting Insects. 

 The mouth exhibits mandibles, usually accompanied by maxillae. 



Order 5. — Hymenopterous Insects. 



Mandibles, and a sucking-lube of three more or less elongated pieces, whose base 

 is enclosed in a short sheath. 



Four wings, naked, membranous, veined and unequal ; anus of the females 

 armed with a sting or provided with a boring-apparatus ; pupa motionless. 



(1) Anus of the females armed with a sting. 



Bee. Ant. 



Monomelites. Mutilla (solitary ant). 



Nomada. Scolia. 



Eucera. Tiphia. 



Andrena. Bembex. 



— Crabro (digging- wasp). 



Wasp. Sphex. 

 Polistes. 



(2) Anus of the females provided with a boring-apparatus. 



Chrysis. 

 Oxyurus. 



Leucopsis [Diptera. H. E.]. 



Evania. 

 Foenus. 



Chalcis. 



Cinips. 



Diplolepis. 



Ichneumon. 



Wood-wasp. 



Oryssus. 



Tenthredo (saw-fly). 



Cimbex (saw-fly). 



Order 6. — Neubopterous Insects. 



Mandibles and maxillae. 



Four wings, naked, membranous and reticulated. ; abdomen elongated, without 

 sting or boring-apparatus ; larva hexapod ; metamorphosis variable. 



(1) Pupa motionless. 



