l62 ON SYSTEMATIC ZOOLOGY. 



Chermes. Snout pectoral ; hind legs formed for leaping. 

 Coccus. Snout pectoral ; body, in the males, ending in 



bristles. 

 Thrips. Snout obsolete ; wings incumbent on the abdomen, 



which is reflexile. 



III. Lepidomera. Wings imbricate with scales. 



Fapilio. Antennae with the tip club-shaped ; wings erect when 



at rest. 

 Sphinx. Antenna thickest in the middle. 

 Phalaena. Antennae thickest towards the base. 



IV. Neuroptera. Wings reticulated. Body without a 

 sting. 



LibeUula. Tail forcipated j mouth with many jaws ; wings 

 expanded. 



Ephemera. Tail with two or three bristles; mouth without 

 teeth ; wings erect. 



Myrmelion. Tail forcipated ; mouth two-toothed ; wings 

 deflected. 



Phryganea. Tail simple; mouth without teeth; wings de- 

 flexed. 



Panorpa. Tail chelate ; mouth with an extended snout ; 

 wings incumbent. 



Raphidia. Tail ending in a single thread ; mouth two-toothed ; 

 wings deflexed. 



V. Hymenopteba. Body armed with a sting. 



Cynips. Sting spiral. 



Tenthredo. Sting serrate ; two-valved. 



Sires. Sting serrate, projecting from a spine Under the ab- 

 domen. 



Ichneumon. Sting exserted or projecting ; triple. 



Sphex. Sting pungent ; wings smooth ; tongue flat, dilated, 

 the tip nearly entire. 



Chrysis. Sting pungent ; body arched beneath. 



Vespa. Sting pungent ; superior wings plaited or folded. 



Apis. Sting pungent ; tongue inflexed. 



Formica. Sting obsolete. Neuters without wings. 



Mutilla. Sting pungent. Neuters without wings. 



VI. Diptera. Wings two, with a poiser under each. 

 * With a proboscis and sucker. 



Diopsis. Head iwo-horned ; eyes terminal (defined after- 

 wards). 



