INTRODUCTION. 



21 



The arrangement whicli I have adopted is, in many- 

 respects, the same, but I have been compelled to alter 

 the nomenclature considerably. The genus Achorutes of 

 Templeton was founded for species in which the spring 

 is present, though small, and must, of course, be 

 retained for these, as M. Nicolet himself subsequently- 

 admitted. Nicolet's name Anuropliorus must give 

 way to Burmeister's Lipura, which has the precedence 

 by several years. The name Desoria was anticipated 

 by Bourlet's Isotoma, and Cyjplioderus by Lepidocyrtus. 



As we shall see in the anatomical part of this work, 

 I differ from Nicolet greatly as to the internal organi- 

 sation of these insects ; but this is probably owing in 

 some measure to our having examined different species. 

 On the whole, his memoir seems to me a very admir- 

 able monograph. 



His species are as follows : 



Aclioinites tuberculatus 

 Anuroi)]ioiais fimetarius 



„ laricis 



Podura aquatica 

 „ similata 

 „ cyanocephala 

 ,, cellaris 

 „ armata 

 „ rufescens 

 Desoria glacialis 

 „ virescens 



tigrina 

 „ fulvomaculata 

 „ ciuerea 

 ,, cylindrica 

 ,, viatica 

 ,, pallida 

 ,, ebriosa 

 „ annulata 

 „ riparia 

 „ fusca 

 Cyphodeirus capucinus 

 gibbulus 

 lignorum 

 pusillus . 

 seneus 

 agUis 

 parvtilus 

 albinos 



= Anoura miiscorum. 

 Lipura fimetaria. 

 ,, corticina. 

 Podura aquatica. 

 Achorutes similatus. 



„ cyanocephalus. 



„ cellaris. 



„ armata. 



„ rufescens. 



Isotoma saltans. 

 „ viridis. 

 ,, tigrina. 

 „ fulvomaculata. 

 ,, cinerea. 

 „ arborea. 

 ,, viatica. 

 „ arborea. 



„ annulata. 



„ aquatilis. 



„ fusca. 

 Lepidocyrtus curvicollis. 



„ gibbulus. 



„ lignorum. 



„ pusillus. 



„ Eeneus. 

 agilis. 



„ parvulus. 

 Beckia albinos. 



