4o6 



THYSANURA. 



CASE But suppose, on the other hand, that the species is elongate 

 and not globular, then it must either belong to the Degeeriadae 

 or to the Poduridag. If to the former, it has its jumping apparatus 

 attached to the fifth abdominal segment ; if to the latter, to the 

 fourth. Supposing it to belong to the former, it is an Orchesella 

 if its antennae have six joints, if only four or five it may belong to 

 one or other of eight genera which we shall mention below. 



If the jumping apparatus is attached to the fourth abdominal 

 segment (Poduridae) it may have either one or two claws to its 

 feet. If two claws, it is an Achorutes — if one, a Podura. 



But it may have nothing of all this and be without a jumping 

 apparatus at all. Well, in that case it will be found either to 

 have mandibles or not. If it has them, it is a Lipura. If it has 

 none, but a suctorial mouth instead, then it must be Anoura. 



Family SMYNTHURID^. 

 No. I. Smynthurus FUSCUS {Linn.). — 1. Magnified sketch of ditto. ^ 



Smynthums fuscus. Copied from Temple- 

 ton's figure n Tr. Eiit. Soc. I. o.i2Sth 

 of an inch in length. 



Smynthurus viridis. Copied from Templeton's fiffure. 

 i-i2th of an inch in length. 



* Where not otherwise stated, all the sketches of Thysanura are taken fn 

 Mr. Hollick's figures in Sir John Lubbock's monograph. 



