ATTEMPTED DIVISION OF BRITISH INSECTS. 429 



and fourth segments ; prehensile feet none. Pupa various. 

 Imago usually with the organs of the mouth, and all the 

 wings fully developed, and resembling net-work. 



Stirps. — Termina. 



Natural Order. — Termites, White Ants, &c. 



Larva with long, filiform, multi-articulate antennae ; strong, corneous, 

 and well-developed, and masticatory mandibles, and six elongate 

 articulate legs : active, omnivorous, and apparently perfect, in one 

 genus living in immense societies. Pupa isomorphous. Imago, 

 with long, filiform, multi-articulate antennae ; strong, corneous, 

 masticatory mandibles ; wings fully developed, recumbent, re- 

 ticulated ; tarsi three-joints. (Termes), Psocus. The larva of 

 a Psocus, which feeds on preserved insects in our cabinets, is 

 called Atropos pulsatorius by some autbors, and is said to make 

 the ticking noise frequently heard in houses, and commonly 

 known as the death-watch ; in its perfect or winged-state it is 

 not uncommon among old books, on windows, &c. 



Stirps. — Perlina. 

 Natural Order. — Perlites, Pearl-flies. 



Larva with long, filiform, multi-articulate antennae ; strong, corneous, 

 masticatory mandibles ; telum furnished with two long, setiform 

 appendages ; active, carnivorous, aquatic. Pupa isomorphous. 

 Imago, with long, filiform, multi-articulate antennas ; strong, cor- 

 neous, masticatory mandibles ; wings fully and equally developed, 

 reticulated, recumbent; the hind-wings folded; tarsi three-jointed. 

 Inhabits the banks of running waters, and is a very favourite food 

 for fish ; flight nocturnal. Perla, Isogenus, Nemoura. Sialis 

 has a necromorphous pupa. 



Stirps. — Raphidiina. 



Natural Order. — Raphidiites, Snake-flies. 



Larva with filiform antennae, and corneous, masticatory mandibles ; 

 active. Inhabits and feeds on decayed wood. Pupa isomorphous. 

 Imago, with moniliform antennae ; corneous, masticatory mandi- 

 bles ; large porrected head ; elongate prothorax ; wings uniformly 

 and fully developed, recumbent, deflexed, not folded, beautifully 

 reticulated ; tarsi four-jointed ; telum with a seta : flight diurnal, 

 in the sunshine. Rapkidia. 



