14 ARKIV FÖR ZOOLOGI. BAND 6. NiO 2. 



minent than in Alichiis, and show an adaption for seeing in 

 the dark, quite analoguous to the telescopic eyes of many 

 deep-sea animals, 



Finall}^ the ability of leaping is a very remarkable feature 

 in an animal which lives underground. Possibly it is acqui- 

 red in connection with the symphylous habits, as a mean 

 of escaping the ants resp. termites in case of danger. The 

 ability is, as above stated, due to the great development of 

 the epimera IV and their musculature: but the concentrating 

 of the legs for forward, the accumulation of the body hairs 

 at the posterior end of the abdomen, as well as the lateral 

 position of legs I and IV and the shape of the claws are 

 also undoubtly characters connected with this mode of loco- 

 motion. The lateral position of legs IV may however be a 

 direct result of the development of the epimera. 



Upsala Mai llth 1905. 



Tryckt den 12 oktober 1909. 



Uppsala 1909. Almqvist & Wiksells Boktryckeri-A.-B. 



