CLASSIFICATION OF INSECTS. 249 



palpi ; aquatic, carnivorous. Pupa isomorphous. 

 Imago with minute antennae nearly concealed ; 

 strong, corneous, masticatory mandibles ; labium 

 of moderate proportions ; wings of uniform de- 

 velopment, beautifully reticulated, porrected la- 

 terally or meeting vertically above the back ; tarsi 

 three-jointed ; flight rapid, well sustained ; active, 

 carnivorous. Agrion, Libellula, Mschna. 



811. Scorpion-flies (Panorpites). Larva and 

 pupa unknown. Imago with long, filiform, multi- 

 articulate antennae ; mandibles and maxillae cor- 

 neous, produced into a beak ; wings of equal 

 development, horizontally recumbent on the back ; 

 tarsi five-jointed ; telum armed with an appendage 

 resembling a lobster's claw : flight weak, of short 

 duration, diurnal. Inhabits abundantly the woods 

 and hedges of England throughout the summer. 

 Panorpa. 



