162 ON SYSTEMATIC ZOOLOGY. 
Chermes. Snout pectoral; hind legs formed for leaping. 
Coccus. Snout pectoral; body, in the mates, ending in 
bristles. 
Thrips. Snout obsolete ; wings incumbent on the abdomen, 
which is reflexile. 
III. Lepmorrera. Wings imbricate with scales. 
Papilio. Antenne with the tip club-shaped ; wings erect when 
at rest. 
Sphinx. Antenne thickest in the middle. 
Phalena. Antenne thickest towards the base. 
IV. Nevrgorrera. Wings reticulated. Body without a 
sting. 
Libellula. Tail forcipated; 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 ina single thread ; mouth two-toothed ; 
wings deflexed. 
VY. Hymenorrera. Body armed with a sting. 
Cynips. Sting spiral. 
Tenthredo. Sting serrate; two-valved. 
Sirex. 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. 
hrysis. 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. Dirrera. Wings two, with a poiser under each. 
* With « proboscis and sucker. 
Diopsis. | Head two-horned; eyes terminal (defined after- 
wards). 
