SOME SPITZBEEGEIT COLLEMBOLA. 617 



Affinities. — A revision of all the Palsearctic Collembola up to 

 1892 has been published by H. Sehott *, who gives diagnoses aud 

 a synonymy of most of the species. 



This species may be distinguished from other boreal Isotomcs 

 by aid of the following synoptical table. I do not, s^however, 

 wish to commit myself to the opinion that all the species here 

 mentioned are really distinct. 



A. Spring not reaching to the ventral tube. 



Isotoma Jimetaria (Linn.). 

 „ mimita, Tullb. 

 „ sexoculata, Tullb. 

 „ quadrioGulata, Tullb. 



B. Spring reaching to the ventral tube. 



a. Antennae twice, or nearly twice, as long as the head. 

 Isotoma viridis (Grinel.), Bourlet. 



„ pahistris (Miill.). 



,, aquatilis (Miill.). 



„ anglica, Lubbock. 



„ Stuxbergii, Tullb. 

 h. Antennae not, or little, longer than the head. 



c. Teeth of the spring obtuse. 



Isotoma crassicauda, Tullb. 

 „ lit oralis^ Scholt. 



d. Teeth of the spring pointed. 



e. Tibia with one or more tenent hairs. 



Isotoma Meuteri., Schott. 

 „ sensihilis, Tullb. 

 „ clavata, Schott. 

 „ denticulata^ Schaffer. 

 „ cinerea, Nicolet. 



f. Tibia without tenent hairs (or tenent hairs no'; 



mentioned). 

 g. Pour or more teeth to the mucrones. 

 Isotoma olivacea, Tullb. 

 ,, violacea, Tullb. 

 „ hiemalis, Schott. 

 „ grandiceps, Eeuter. 



* Harai.d Schott. " Zur Systematik und VerbreituDg der palsearctischer 

 Collembola," K. Svensk. Vet.-Akad. Handl. vol. xxv. no. li (1893). 



