270 CLASSIFICATION OF INSECTS. 



company, rising and falling, and is the favourite food of 

 fish. Ephemera, Baetis, Cloeon. 



Scorpion-flies or Panorpites. Larva and pupa unknown. 

 Imago with long, filiform, multi-articulate antennae ; man- 

 dibles and maxillae corneous, produced into a beak; wings 

 of equal development, horizontally recumbent on the back; 

 tarsi five-jointed; telum armed with an appendage resem- 

 bling a lobster's claw : flight weak, of short duration, 

 diurnal. Inhabits abundantly the woods and hedges of 

 England throughout the summer. Panorpa. 



Dragon-flies or Libellulites. Larva with short antennae ; 

 mandibles corneous, masticatory; labium very elongate, 

 jointed and remarkable, being furnished with predatory, 

 acute, mandibuliform palpi; aquatic, carnivorous. Pupa 

 isomorphous. Imago with minute antennae nearly con- 

 cealed; mandibles strong, corneous, masticatory ; labium of 

 moderate proportions ; wings of uniform development, beau- 

 tifully reticulated, porrected laterally or meeting vertically 

 above the back ; tarsi three-jointed ; flight rapid, well sus- 

 tained ; active, carnivorous. Agrion, Libellula, JEschna, 

 represented at page 199, the central figure. 



Aberrant Orders. Ticklers or Thripsites. Larva re- 

 sembles the perfect insect, but has a softer body, with the 

 meso- and metathorax distinct ; the mouth is almost similar 

 to that of the imago, but the antennae and legs are shorter; 

 there are no simple eyes, and the compound are replaced 

 by conglomerate eyes. Pupa resembles the perfect insect, 

 but the articulation of the limbs is obscured by a film, 

 and the wings are enclosed in short fixed sheaths : the an- 

 tennae are turned back on the head, and the insect, though 

 it moves about, is much more sluggish than in the other 

 states. Imago having the parts of the mouth united to form 

 a short conical sucker, more fleshy than horny and not retrac- 

 tile ; the labium has the usual parts, the labium, properly 



