8 INTKODUCTION. 



same as those of Liungeus, with the addition of P. 

 annulata and P. Ugnorum. 



Miiller, in 1776,^ described four species of Lejnsma 

 and seven of Podura. His descriptions are very short, 

 and, though characteristic as far as they go, sometimes 

 leave even the genus doubtful. In several cases I can- 

 not even guess at the species which is intended. Some 

 of his descriptions appear to have been taken from 

 injured specimens. Thus, Lejnsma terrestris is de- 

 scribed simply as " nuda, cauda triplici." But unfortu- 

 nately, all the Lepismidce have scales and three caudal 

 appendages. The first portion of the description, 

 therefore, applies to no Lepisma ; the rest to them all. 

 Possibly he may have had a Nicoletia before him, but 

 that genus has not yet been recognised in Denmark. 

 Again, Podura motitans, P. nemoralis^ P. argenteo- 

 aurata, and P. ccerulea are so shortly and insufficiently 

 described that I cannot even guess to what genus they 



^ ' Zoologia) Dania3 Prodromus, scu animalium Dania3 et Norvegias 

 indigenarum cbaraeteres, nomina, et synoiiima imprimis populanum.' 

 Hafuia;, 177G. 



